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TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope

SKU : OS-TPO-180

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  • The ultimate portable travel telescope/lens
  • Smallest dedicated astrophotography telescope on the market with a focal length of just 180mm at f/4.5
  • Weighs less than 1 lb (395 g) and easily fits in your hand
  • Extremely versatile: an imaging telescope, guide scope, finder scope, and visual spotting scope all in one
  • Can image with sensors as large as full frame
  • Seamless DSLR/Mirrorless camera connection with a standard size M42 T-ring

Product Details

  • TPO 180 Ultrawide Astrophotography Telescope & Guide Scope

    The TPO UltraWide 180 Astrophotography Lens & Guide Scope is the smallest dedicated astrophotography telescope on the market, but don't be fooled by its size — this telescope can produce spectacular images.


    Tiny, Yet Mighty

    Weighing in at less than a pound, the TPO UltraWide 180 is the ultimate portable astrophotography telescope/lens. With a 180mm focal length and a fast f/4.5 focal ratio, this scope can yield fantastic images that cover vast regions of the night sky. The tube itself weighs just 13.9 oz (395 g), meaning you can truly take it anywhere. With the TPO UltraWide 180, you can forget having to leave your telescope at home. It's the perfect imaging companion for going camping, backpacking, and on road trips. It can even tuck into your luggage bag for your next flight — no more wishing you could bring your telescope with you the next time you visit somewhere with dark skies.



    Astrophotography Optical Performer

    The TPO UltraWide 180 features an air-spaced triplet APO design with dual ED elements. When paired with the included three-element reducer, the telescope can provide superior correction that leads to pristine images free of chromatic aberration. Its large image circle can cover crop-sensor cameras with ease, and is even compatible with sensors as large as full frame, though there may be a slight drop-off in corner performance with these sensors.



    Not Your Average Lens

    With an aperture of just 40mm and an overall length of just 145mm, the TPO UltraWide 180 may look like a camera lens at first glance. Make no mistake, though — this small scope can outperform camera lenses designed for cameras in its class with ease. Camera lenses, which are designed for daytime photography, have aperture blades inside that cause diffraction spikes on bright stars, which can be an undesirable effect for astrophotography. The TPO UltraWide 180 is a fixed aperture with no aperture blades, meaning that stars remain round and tight for cleaner images.



    Next-Level Versatility

    Although the TPO UltraWide 180 was designed to be a deep sky astrophotography telescope, it can be used in a myriad of other ways as well. Also included in the box are two extension tubes, tube rings, a Vixen dovetail plate, an Arca-Swiss camera plate, and a 1.25" eyepiece/accessory adapter. This means you can use the TPO UltraWide 180 as a quality guide scope when paired with a mini guide camera, or even use it visually with 1.25" eyepieces as a main scope or finder scope. The three-element reducer unscrews for visual or autoguiding purposes, which turns the telescope into a 220mm f/5.5 system. The standard Vixen-style shoe will fit into both Vixen saddles and traditional finder shoes. The included Arca-Swiss camera plate allows the telescope to even be fitted directly to a compatible camera tripod. With the TPO UltraWide 180, the possibilities are truly endless.


    Sadr Region by Drew Evans on the TPO Ultrawide 180

    The Sadr Region by Drew Evans with the TPO UltraWide 180, the ZWO ASI294MM Pro, and 7nm Ha, OII & SIII filters


    Generous Back Focus for Astrophotographers

    The TPO UltraWide 180 features a standard back focus of 55mm, which allows for seamless attachment of your preferred camera. For DSLR/Mirrorless camera owners, just use the appropriate M42 T-ring for your camera lens mount and you're good to go. The telescope features 42mm rear threads, so be sure to use an M42 size T-ring. For astronomy-dedicated camera owners, the TPO UltraWide 180's generous back focus can accommodate small additions to the imaging train, such as a filter drawer to hold a multi-bandpass or narrowband filter. By removing the extension tube on the back of the reducer, up to 99mm of back focus spacing becomes available. Please note that with this telescope's fast focal ratio of f/4.5, we recommend getting back focus spacing as accurate as possible. See our back focus spacing guide for help.


    TPO UltraWide 180 System Chart

    TPO Ultrawide 180 System Chart and Setup


  • specifications

    Back Focus55mm (with Reducer Extension Tube)
    Back Focus99mm (without Reducer Extension Tube)
    Camera ConnectionM42 x 0.75
    Compatible Eyepieces/Accessories1.25"
    Focal Length180mm
    Focal Ratiof/4.5
    Optical DesignTriplet Refractor
    Tube Diameter52mm
    Tube Length145mm (with Reducer)
    Tube Weight13.9 oz (395 g)
  • included items

    • TPO UltraWide 180 Astrophotography Lens
    • Three-Element Reducer with Reducer Extension Tube
    • Extension Tube 1
    • Extension Tube 2
    • 1.25" Adapter
    • Tube Rings
    • Vixen/Finder Dovetail Plate
    • Arca-Swiss Dovetail Plate
    • Dovetail Stalk
    • Hex Key

Product Reviews

Customer Reviews
4.7 Based on 29 Reviews
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Martin L.
United States

TPO 180 lens

Very easy to use, lens, helped me solve focusing issue compared to a dslr lens

Russ M.
United States United States

Great little imaging scope that’s perfect if you’re on the go!

I’ve only been able to image with the scope one time, but wow, did it deliver! I used an astromodded Canon EOS 60D, a SkyGuider Pro (unguided) and the TPO 180. I used the ASI Air for polar aligning and running the imaging session. Without guiding, I was limited to 3 minute subs and there were 35 of those. I also shot 10 darks, 20 bias and 20 flats. I processed in Deep sky stacker and then went to work in Photoshop. Bottom line: This little scope makes it REALLY easy. The portability factor cannon be denied. If you’re looking for a mobile, lightweight wide field solution, this is a great option for you.

OPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope ReviewOPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope Review
Mark S.
United States United States


I've had the TPO 180 for about a month and have used it for both visual and photography. It's a bit tricky to get set up but I did my first photo session last night and I'm happy with the results. As mentioned other places, back focus is tricky and not well documented. I used the scope+reducer/flatner+medium sized extension tube (included)+an M42M-M48F-16.5L adapter (came with my camera)+ASI294MCPro and found focus in the middle of the focusing range. The build quality is very good; portability is great ... It's going to be a fun addition to my arsenal at f=180! Attached photos show the setup on my AVX mount (along with guide camera and ASIAir Pro); imaging setup without camera attached; and first results

OPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope ReviewOPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope ReviewOPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope Review
Cory H.
United States United States

Versatile scope

Using it primarily as a finderscope with intentions for astrophotography. One suggestion for upgrading this package to differentiate it from the Askar 180: an Arca-Swiss/***** plate instead of just Arca specific and a brass compression fitting rather than than set screws for holding accessories. Beautiful scope nonetheless.

Mario P.
United States United States

One of my favorites

Definitely one of my favorite scope. The field flattener is simply flawless on this thing. It’s so light and powerful, both images shot with an Asi294mc pro, L-extreme filter with 5 min subs. It made processing a breeze.

OPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope ReviewOPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope Review
Chase N.
United States United States

This is a great little scope

While still new to the hobby of Astrophotography, I was looking for a lower focal length lens to use, while I traveled up to the Boundary Waters Canoe Area MN, a bortle 1 area. Due to size needed for the trip, I was looking at maybe getting a 135mm lens, but then this little guy came back in stock, so I decided to go for this instead. I am glad I did! This scope is small, fits perfectly in my little Pelican Case used to transport my camera and Skyguider. The scope is very well made, feels extremely sturdy and the focuser is solid, maybe a tad tough to move, but nothing to write off about. Along with the scope came some extension tubes and nice blue mounting rings that mount nicely to the arca-swiss dovetail. If you are in need of an ultrawide, I highly recommend this scope. The attached image is only 37.5 minutes at ISO 3200 of the Pleiades.

OPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope Review