# How Smart Telescopes Work: Plate Solving to Stacking > How smart telescopes work: plate solving, GoTo, field rotation, live stacking, darks, dual-band filters and stretching, plus pixel scale and field of view… - Source: https://smarttelescopereview.com/posts/how-smart-telescopes-work/ - Markdown version: https://smarttelescopereview.com/posts/how-smart-telescopes-work.md - Last updated: 2026-11-12 --- - [Home](https://smarttelescopereview.com/) - [Guides](https://smarttelescopereview.com/guides/) - How Smart Telescopes Work: Plate Solving, Live Stacking and the Numbers That Matter Explainer # How Smart Telescopes Work: Plate Solving, Live Stacking and the Numbers That Matter Updated November 12, 2026 By [Smart Telescope Review Editorial Team](https://smarttelescopereview.com/about/) [How we research](https://smarttelescopereview.com/how-we-research/) Prices are approximate and change often, so check the current price before you buy. ## Key takeaways - Every smart telescope runs the same loop: **plate-solve, GoTo, track, short exposures, live stacking, stretch**. The differences are optics, sensor and software. - Short subs (often 10–30 s) are stacked because alt-az mounts rotate the field; EQ mode on Seestars and Dwarfs allows longer exposures. - **Aperture** sets light grasp (it scales with the square), **focal ratio** sets how fast an image builds, and **focal length** sets field and scale. - Pixel scale = 206.265 × pixel size (µm) ÷ focal length (mm): 2.30″ on the Seestar S50 Pro, 1.68″ on the Vespera Pro 2, 1.23″ on the Celestron Origin. - Dual-band filters help emission nebulae from bright skies; they don't help galaxies, star clusters or reflection nebulae. ## Our top picks - 1![ZWO Seestar S50 Pro Smart Telescope](https://smarttelescopereview.com/_astro/seestar-s50-pro.BOj1gADQ_1F3c68.webp)The reference design: 50 mm f/5.2, built-in dual-band filter, EQ mode, about $999[ZWO Seestar S50 Pro Smart Telescope](https://smarttelescopereview.com/smart-telescopes/seestar-s50-pro/)50 mm f/5.2 · 2.45° × 1.38° · 6.2 lb8.6**$$**$$Mid-rangePrice tier: Mid-range[Check price on Amazon](https://www.amazon.com/dp/B0HP1RDLVP?tag=smarttelescopereview.com-20) - 2![DWARFLAB Dwarf 3 Smart Telescope](https://smarttelescopereview.com/_astro/dwarf-3.BTcvoQNe_1cVPwz.webp)Fastest small optics: 35 mm f/4.3 with a 4K Starvis 2 sensor, about $549[DWARFLAB Dwarf 3 Smart Telescope](https://smarttelescopereview.com/smart-telescopes/dwarf-3/)35 mm f/4.3 · 2.93° × 1.65° · 3 lb8.2**$**$$$BudgetPrice tier: Budget[Check price](https://www.amazon.com/dp/B0FHP6K4BK?tag=smarttelescopereview.com-20) - 3![Vaonis Vespera Pro 2 Smart Telescope](https://smarttelescopereview.com/_astro/vaonis-vespera-pro-2.DT17Tmq0_1TIPwW.webp)Finest 50 mm sampling: 1.7″ per pixel and automatic master darks, about $2,990[Vaonis Vespera Pro 2 Smart Telescope](https://smarttelescopereview.com/smart-telescopes/vaonis-vespera-pro-2/)50 mm f/4.9 · 1.6° × 1.6° · 11 lb8.1**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B0GY1TH8QQ?tag=smarttelescopereview.com-20) ### On this page 13 sections - [Step 1: Plate solving](#step-1-plate-solving) - [Step 2: GoTo, tracking and field rotation](#step-2-goto-tracking-and-field-rotation) - [Step 3: Short exposures](#step-3-short-exposures) - [Step 4: Live stacking](#step-4-live-stacking) - [Step 5: Dark frames and calibration](#step-5-dark-frames-and-calibration) - [Step 6: Filters](#step-6-filters) - [Step 7: Stretching and processing](#step-7-stretching-and-processing) - [The optical numbers that matter](#the-optical-numbers-that-matter) - [Pixel scale: the formula and worked numbers](#pixel-scale-the-formula-and-worked-numbers) - [Field of view: the formula](#field-of-view-the-formula) - [Three designs, three trade-offs](#three-designs-three-trade-offs) - [How we sourced this](#how-we-sourced-this) - [FAQ](#faq) ## Before you choose - [Smart Telescope vs Traditional Telescope: Which Should You Buy?](https://smarttelescopereview.com/posts/smart-telescope-vs-traditional-telescope/) - [Smart Telescope EQ Mode Explained: Field Rotation, Polar Alignment and What You Need](https://smarttelescopereview.com/posts/smart-telescope-eq-mode-explained/) - [The Best Filters for Smart Telescopes: Built-In, Dual-Band, Broadband and Solar](https://smarttelescopereview.com/posts/best-filters-for-smart-telescopes/) A smart telescope looks like a sealed box, but inside it’s doing the same things an experienced astrophotographer does with a mount, a camera and a laptop. It just does them automatically, in a few minutes, and hands you a finished picture on your phone. Once you know what’s happening at each step, the spec sheets make a lot more sense, and so do the differences between a $474 Seestar and a $4,299 Celestron Origin. This explainer covers the imaging loop first (plate solving, GoTo, tracking, short exposures, live stacking, calibration, filters and stretching), then the optical numbers that decide what each scope can do, with worked examples from the models we track. We haven’t tested these telescopes ourselves; specs are the makers’ and test findings are credited to the outlet that ran them. How a smart telescope builds an image Every smart scope here follows the same loop; the differences are optics, sensor and software polish. 1. Plate-solveThe camera takes a short frame, matches the star pattern to a catalog and works out exactly where it's pointing. No star alignment, no finder scope. 2. GoTo & trackMotors slew to your target and follow it as the Earth turns. Alt-az mounts also rotate the image slowly, which the software corrects. 3. Short exposuresInstead of one long exposure, the scope takes many 10–30 s frames. Frames spoiled by clouds, wind or bumps are rejected. 4. Live stackingEach new frame is aligned and averaged into the running image, so noise drops and faint detail appears as you watch: roughly √N better signal-to-noise after N frames. 5. Stretch & shareThe app stretches the faint data, removes gradients and denoises, then saves a JPEG (and often FITS/TIFF) to your phone. See it applied to your sky in the [stacking time estimator](https://smarttelescopereview.com/tools/integration-time/). ## Step 1: Plate solving Traditional GoTo telescopes need a star alignment: you center two or three known stars and the mount builds a model of the sky. Smart telescopes skip that. The main camera takes a short frame, and the software compares the pattern of stars with a catalog to work out exactly where the telescope is pointing and how the frame is rotated. That’s plate solving, and it takes seconds. Plate solving is also how the scope re-centers after a slew and how it knows to build a mosaic in the right places. Celestron’s phone-guided StarSense telescopes use the same idea through your phone’s camera, but you push the tube yourself; see [smart vs traditional telescopes](https://smarttelescopereview.com/posts/smart-telescope-vs-traditional-telescope/). ## Step 2: GoTo, tracking and field rotation Once the scope knows where it’s pointing, motors slew it to your target and keep following it as the Earth turns. Nearly all smart telescopes use an alt-az mount, which moves up-down and left-right. The sky, though, turns around the celestial pole. An alt-az mount can keep a target centered, but over time the frame slowly rotates around it. This is field rotation. Smart telescopes handle it in software: each frame is rotated back into line before stacking, and the edges get cropped. Rotation also limits how long a single exposure can be before stars at the edges smear. That’s why some makers offer an EQ mode: tilt the scope to your latitude so one axis lines up with the celestial pole, and rotation goes away. ZWO says the Seestar S50 Pro allows 60-second exposures in EQ mode with its TH10 head; DWARFLAB claims 60 s for the Dwarf 3 and 90 s for the Dwarf Mini. Vaonis and Unistellar scopes are alt-az only. Our [EQ mode guide](https://smarttelescopereview.com/posts/smart-telescope-eq-mode-explained/) explains the setup. ## Step 3: Short exposures Instead of one long exposure, the scope takes many short ones, often 10–30 seconds each. Short subs keep each frame sharp despite rotation and small tracking errors. They also mean a gust of wind, a passing car’s headlights or a satellite trail spoils one frame, not the whole night, and the software simply rejects that frame. ## Step 4: Live stacking This is the heart of a smart telescope. Each new frame is aligned to the stack (by matching stars) and averaged into a running image. Random noise partly cancels out as frames add up, while the real signal from the target builds. As AstroBackyard’s guide to live stacking explains, the noise falls in real time as you watch, which is what makes it feel like observing rather than waiting. Signal-to-noise improves roughly with the square root of the number of frames, so 100 frames are about 10× cleaner than one, and 400 frames only twice as clean as 100. That diminishing return is why faint targets need hours, not minutes. To estimate how long a target needs on your scope and sky, use the [stacking time estimator](https://smarttelescopereview.com/tools/integration-time/#target=m42&scope=seestar-s50-pro&bortle=7). ## Step 5: Dark frames and calibration Camera sensors add their own noise and a sprinkling of “hot” pixels that glow even in total darkness, especially when warm. A dark frame is an exposure with no light reaching the sensor. Subtract it from your light frames and much of that pattern disappears. Makers handle this differently. ZWO lists a dark filter on every current Seestar, an opaque position that lets the camera record darks. Vaonis says the [Vespera Pro 2](https://smarttelescopereview.com/smart-telescopes/vaonis-vespera-pro-2/) takes automatic master darks, while Zelpio found the Vespera 3 doesn’t, so hot pixels can show as green rows in its stacks. Stacking with slight shifts between frames (dithering) also helps hide hot pixels, and Celestron added dithering to the Origin in a 2026 app update. ## Step 6: Filters A UV/IR-cut filter keeps stars sharp by blocking light the optics don’t focus well. A dual-band filter passes only two narrow slices of the spectrum: H-alpha and OIII, the light that emission nebulae give off. The Seestar S50 Pro’s passbands are 20 nm (H-alpha) and 30 nm (OIII), per ZWO; a dedicated filter such as the Optolong L-eXtreme narrows them to 7 nm each, according to First Light Optics’ listing. Everything in between, including most streetlight glow, is blocked. Filters for smart telescopes Built-in on Seestar and Dwarf models; optional on Vaonis and Celestron; software only on Unistellar. UV/IR-cut (clear)Default on every smart scope: sharp stars, natural color. Use for galaxies, clusters and the Moon. Dual-band / narrowband (H-alpha + OIII)Passes only the two colors emission nebulae glow in and blocks most light pollution, including LEDs. Big gains on nebulae; useless for galaxies and clusters. Broadband light-pollution (CLS, L-Pro)Cuts sodium and mercury streetlight lines while keeping star color. Modest help under old-style lighting, little under white LEDs. White-light solar filterBlocks 99.999%+ of sunlight at the front of the scope for sunspots. Must be a certified full-aperture filter, never at the eyepiece end. Which to buy for your scope: [best filters for smart telescopes](https://smarttelescopereview.com/posts/best-filters-for-smart-telescopes/). The catch: galaxies, star clusters and reflection nebulae shine across the whole spectrum, so a dual-band filter dims them along with the sky. Use it for nebulae like the Orion and Rosette, and take it out for Andromeda. Our [filter guide](https://smarttelescopereview.com/posts/best-filters-for-smart-telescopes/) and [city skies guide](https://smarttelescopereview.com/posts/smart-telescopes-light-pollution-city/) go further. ## Step 7: Stretching and processing Raw stacked data looks almost black, because faint nebulae sit just above the background. Stretching brightens the faint tones far more than the bright ones, so the nebula appears without blowing out the stars. Apps also remove gradients (the uneven glow from light pollution or the Moon), reduce noise and balance color, then save a JPEG. Many also save FITS or TIFF files for editing on a computer; Vaonis lists BalENS gradient removal on the Vespera Pro 2. ## The optical numbers that matter Three numbers set what any telescope can do. Aperture is the diameter of the main lens or mirror. Light grasp scales with its square, so a 50 mm lens collects about 2.8× the light of a 30 mm one, and the Origin’s 152 mm mirror about 9× that of 50 mm. Aperture and light grasp Bar length is light-gathering area (aperture squared), so a 114 mm mirror collects about 5× what a 50 mm lens does. Celestron Unistellar ZWO Vaonis DWARFLAB [Origin Mark II 152 mm](https://smarttelescopereview.com/smart-telescopes/celestron-origin-mark-ii/)[StarSense DX 130AZ 130 mm](https://smarttelescopereview.com/smart-telescopes/celestron-starsense-dx-130az/)[StarSense LT 114AZ 114 mm](https://smarttelescopereview.com/smart-telescopes/celestron-starsense-lt-114az/)[eQuinox 2 114 mm](https://smarttelescopereview.com/smart-telescopes/unistellar-equinox-2/)[eVscope 2 114 mm](https://smarttelescopereview.com/smart-telescopes/unistellar-evscope-2/)[Unistellar Odyssey 85 mm](https://smarttelescopereview.com/smart-telescopes/unistellar-odyssey/)[Odyssey Pro 85 mm](https://smarttelescopereview.com/smart-telescopes/unistellar-odyssey-pro/)[Seestar S50 Pro 50 mm](https://smarttelescopereview.com/smart-telescopes/seestar-s50-pro/)[Vespera II 50 mm](https://smarttelescopereview.com/smart-telescopes/vaonis-vespera-ii/)[Vespera 3 50 mm](https://smarttelescopereview.com/smart-telescopes/vaonis-vespera-3/)[Vespera Pro 2 50 mm](https://smarttelescopereview.com/smart-telescopes/vaonis-vespera-pro-2/)[Dwarf 3 35 mm](https://smarttelescopereview.com/smart-telescopes/dwarf-3/)[Dwarf Mini 30 mm](https://smarttelescopereview.com/smart-telescopes/dwarf-mini/)[Seestar S30 Plus 30 mm](https://smarttelescopereview.com/smart-telescopes/seestar-s30-plus/)[Seestar S30 Pro 30 mm](https://smarttelescopereview.com/smart-telescopes/seestar-s30-pro/) Aperture sets how faint and how sharp you can go; focal ratio sets how fast an image builds. See [how smart telescopes work](https://smarttelescopereview.com/posts/how-smart-telescopes-work/). Focal length sets image scale: longer focal lengths magnify more and frame less sky. Focal ratio is focal length ÷ aperture. It sets how bright each patch of the image is on the sensor, and so how fast an image builds. The S50 Pro is 260 ÷ 50 = f/5.2; the [Dwarf 3](https://smarttelescopereview.com/smart-telescopes/dwarf-3/) is 150 ÷ 35 = f/4.3; the Celestron Origin is 335 ÷ 152 = f/2.2. Going from f/5.2 to f/2.2 makes each patch of sky about 5.6× brighter on the sensor. ## Pixel scale: the formula and worked numbers Pixel scale tells you how much sky each pixel covers: Pixel scale (arcseconds per pixel) = 206.265 × pixel size (µm) ÷ focal length (mm) | Scope | Pixel | Focal length | Pixel scale | Jupiter (~45″) | | --- | --- | --- | --- | --- | | [Seestar S30 Pro](https://smarttelescopereview.com/smart-telescopes/seestar-s30-pro/) | 2.9 µm | 160 mm | 3.74″ | ~12 px | | [Dwarf 3](https://smarttelescopereview.com/smart-telescopes/dwarf-3/) | 2.0 µm | 150 mm | 2.75″ | ~16 px | | [Seestar S50 Pro](https://smarttelescopereview.com/smart-telescopes/seestar-s50-pro/) | 2.9 µm | 260 mm | 2.30″ | ~20 px | | [Vespera Pro 2](https://smarttelescopereview.com/smart-telescopes/vaonis-vespera-pro-2/) | 2.0 µm | 245 mm | 1.68″ | ~27 px | | [eQuinox 2](https://smarttelescopereview.com/smart-telescopes/unistellar-equinox-2/) | 2.9 µm | 450 mm | 1.33″ | ~34 px | | [Origin Mark II](https://smarttelescopereview.com/smart-telescopes/celestron-origin-mark-ii/) | 2.0 µm | 335 mm | 1.23″ | ~37 px | | [Odyssey](https://smarttelescopereview.com/smart-telescopes/unistellar-odyssey/) | 1.45 µm | 320 mm | 0.93″ | ~48 px | Worked example for the S50 Pro: 206.265 × 2.9 ÷ 260 = 2.30″ per pixel. Smaller numbers mean finer sampling and more pixels across small targets, which is why the Vespera Pro 2 and Unistellar scopes suit small galaxies. DWARFLAB notes the Dwarf 3’s pixels can be binned 2 × 2 (4 µm) for astro work at 1080p output, which doubles its effective scale. ## Field of view: the formula Field of view (degrees) = sensor dimension (mm) ÷ focal length (mm) × 57.3, where sensor dimension = pixel count × pixel size. - **Seestar S50 Pro:** 3840 × 2.9 µm = 11.1 mm wide and 2160 × 2.9 µm = 6.3 mm tall. 11.1 ÷ 260 × 57.3 ≈ 2.45°, and 6.3 ÷ 260 × 57.3 ≈ 1.38°. - **Dwarf 3:** 3840 × 2.0 µm = 7.7 mm; 7.7 ÷ 150 × 57.3 ≈ 2.93° wide. - **Vespera Pro 2:** 3536 × 2.0 µm = 7.1 mm square; 7.1 ÷ 245 × 57.3 ≈ 1.65° (Vaonis quotes 1.6°). That’s why the Andromeda Galaxy, about 3° long, fits in one S30 Pro frame but needs two panels on the S50 Pro. Try any target and scope in the [framing calculator](https://smarttelescopereview.com/tools/fov-calculator/#target=m31&scope=seestar-s50-pro). ## Three designs, three trade-offs - **[Seestar S50 Pro](https://smarttelescopereview.com/smart-telescopes/seestar-s50-pro/)** is the balanced reference: 50 mm at f/5.2, 2.30″ pixels, a 2.45° field, built-in dual-band and dark filters, EQ mode. About $999. [Check the S50 Pro price](https://www.amazon.com/dp/B0HP1RDLVP?tag=smarttelescopereview.com-20). - **[Dwarf 3](https://smarttelescopereview.com/smart-telescopes/dwarf-3/)** trades aperture for speed and portability: f/4.3 optics, a 4K Starvis 2 sensor and a 2.93° field in 1.35 kg. About $549. [Check the Dwarf 3 price](https://www.amazon.com/dp/B0FHP6K4BK?tag=smarttelescopereview.com-20). - **[Vespera Pro 2](https://smarttelescopereview.com/smart-telescopes/vaonis-vespera-pro-2/)** trades field for detail: 1.68″ pixels, automatic darks and a 1.6° square field. About $2,990. [Check the Vespera Pro 2 price](https://www.amazon.com/dp/B0GY1TH8QQ?tag=smarttelescopereview.com-20). ## How we sourced this Specs (aperture, focal length, pixel size, pixel count, filters, exposure limits) are the makers’ own figures from models we track; we compute pixel scale and field from them and note where makers quote something different. Test findings come from the outlets named. Our tools use the same formulas, stated on each tool page, and our method is on [how we research](https://smarttelescopereview.com/how-we-research/). ## Don't guess. Calculate. - [🔭 Sky Target Checker](https://smarttelescopereview.com/tools/sky-target-checker/): what each scope can see from your sky - [🖼️ FOV Calculator](https://smarttelescopereview.com/tools/fov-calculator/): framing and mosaics, scope by scope - [🎯 Telescope Matcher](https://smarttelescopereview.com/tools/telescope-matcher/): which scopes fit your budget and goals - [📊 Compare every scope](https://smarttelescopereview.com/smart-telescopes/): sortable spec table ## Frequently asked questions ### How does a smart telescope know where to point? It plate-solves. The camera takes a short frame, the software matches the star pattern to a catalog and works out exactly where the scope is pointing. Then the motors slew to your target. There's no star alignment or finder scope. ### What is live stacking? Live stacking takes many short exposures, aligns each new frame to the last and averages them into a running image. Noise drops as frames are added (roughly with the square root of the frame count), so faint detail appears while you watch. ### Why do smart telescopes use short exposures? Most run on alt-az mounts, which make the image rotate slowly as they track. Short subs keep each frame sharp, and the software rotates them back into line. Short frames also let the scope throw out the few spoiled by wind, cars or satellites. ### What does the focal ratio of a telescope mean? It's focal length divided by aperture. A lower number (faster) puts more light on each patch of the sensor per second. The Seestar S50 Pro is 260 ÷ 50 = f/5.2; the Celestron Origin is 335 ÷ 152 = f/2.2, which is why its images build so quickly. ### How do I calculate a telescope's field of view? Multiply pixel count by pixel size to get sensor width in mm, divide by focal length, and multiply by 57.3 to get degrees. For the Seestar S50 Pro: 3840 × 2.9 µm = 11.1 mm; 11.1 ÷ 260 × 57.3 ≈ 2.45°. ## Sources - [AstroBackyard: Live stacking and EAA](https://astrobackyard.com/live-stacking-and-eaa/) · checked 2026-11-12 — Live stacking combines many short exposures in real time, reducing noise as the image builds; it is the basis of electronically assisted astronomy (EAA). - [First Light Optics: Optolong L-eXtreme dual-band filter](https://www.firstlightoptics.com/narrowband/optolong-dual-band-l-extreme-filter.html) · checked 2026-11-12 — Two 7 nm passbands at H-alpha and OIII with no transmission between H-beta and OIII; not for solar use. - [Vaonis: Vespera new generation (Vespera 3 and Vespera Pro 2)](https://vaonis.com/pages/vespera-new-generation) · checked 2026-11-12 — Vaonis lists automatic master darks and BalENS gradient removal on the Vespera Pro 2, with about 1.7″ per pixel. - [Zelpio: Vaonis Vespera 3 review](https://www.zelpio.com/blog/vaonis-vespera-3-review/) · checked 2026-11-12 — The Vespera 3 takes no automatic dark frames, so hot pixels can show as green rows; real-world battery was about 12 h. - [ZWO: Seestar S50 Pro product page](https://www.zwoastro.com/product/seestar-s50-pro/) · checked 2026-11-12 — 50 mm f/5.2 with 2.9 µm pixels, dual-band (OIII 30 nm / H-alpha 20 nm) and dark filters, and 60-second exposures in EQ mode. - [DWARFLAB: Dwarf 3 smart telescope](https://www.dwarflab.com/us/products/dwarf-3-smart-telescope) · checked 2026-11-12 — 35 mm aperture, 150 mm focal length, Sony IMX678 with 2 µm pixels and a dual narrowband filter. ## Get new guides by e-mail One short e-mail when Smart Telescope Review publishes a new guide. No spam, no sharing your address, and you can unsubscribe in one click. E-mail address New posts only · Unsubscribe anytime · [Privacy](https://smarttelescopereview.com/privacy/) Our #1 pick The reference design: 50 mm f/5.2, built-in dual-band filter, EQ mode, about $999 ![ZWO Seestar S50 Pro Smart Telescope](https://smarttelescopereview.com/_astro/seestar-s50-pro.BOj1gADQ_21iw81.webp) ### [ZWO Seestar S50 Pro Smart Telescope](https://smarttelescopereview.com/smart-telescopes/seestar-s50-pro/) 8.6 - 50 mm f/5.2 - 2.45° × 1.38° field - 6.2 lb - EQ mode - Dual-band filter Most buyers: the best all-round smart telescope for backyard deep-sky imaging, the Moon and the Sun at under $1,000, and the direct replacement for the discontinued Seestar S50. $$$$ Mid-range Price tier: Mid-range Amazon price, Nov 12, 2026 [Check price on Amazon](https://www.amazon.com/dp/B0HP1RDLVP?tag=smarttelescopereview.com-20)[Read the full review](https://smarttelescopereview.com/smart-telescopes/seestar-s50-pro/) [🎯 Not sure which fits? Match a smart telescope to your budget, sky and targets in 30 seconds.](https://smarttelescopereview.com/tools/telescope-matcher/)[🔭 What can it see? Check 56 targets against your sky and any scope.](https://smarttelescopereview.com/tools/sky-target-checker/) ## Keep reading [Explainer ### Smart Telescope vs Traditional Telescope: Which Should You Buy? Smart telescope vs traditional telescope: screen vs eyepiece, planets vs deep sky, learning curve, cost and portability, plus the phone-guided middle ground. Updated Nov 12, 2026](https://smarttelescopereview.com/posts/smart-telescope-vs-traditional-telescope/)[Explainer ### Smart Telescope EQ Mode Explained: Field Rotation, Polar Alignment and What You Need What EQ mode does on a smart telescope, why alt-az field rotation limits exposures, which Seestar, Dwarf and Origin models support it, and the gear you need. Updated Nov 12, 2026](https://smarttelescopereview.com/posts/smart-telescope-eq-mode-explained/)[Filters ### The Best Filters for Smart Telescopes: Built-In, Dual-Band, Broadband and Solar Which filters your smart telescope already has, which add-on filters actually fit Seestar, Dwarf, Vespera and Origin, and when a dual-band filter is worth it. Updated Nov 12, 2026](https://smarttelescopereview.com/posts/best-filters-for-smart-telescopes/) The reference design: 50 mm f/5.2, built-in dual-band filter, EQ mode, about $999 Seestar S50 Pro $$$$ Mid-range Price tier: Mid-range [Check price](https://www.amazon.com/dp/B0HP1RDLVP?tag=smarttelescopereview.com-20)