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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.


  • 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 24 Reviews
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Filter Reviews:
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
Allen G.
United States United States
TPO 180 Lens

Its fantastic! I mounted it on top of my Explore Scientific Ed102 because the dovetail supplied is marginal at best. not wide enough to fit the plate on my mount. , but the optics are sharp and the field of view is breath taking! A very good purchase, especially when combined with my Asi 294 mc pro.

Didier G.
Thailand Thailand
Expected more

both included saddles didn’t fit with my iOptron skyguider pro. Using Asi290MC did not give magnifications showed on pictures. No user’s guide on the extensions tube. So, average experience.

United States United States

I tried it out on the Andromeda galaxy this past weekend. We have superb dark skies where we live, and I was able to center the galaxy and capture good images.

George G.
United States United States
Tpo Ultrawide 180 f/4.5 Astrophotography lens

Astrophotography-wise i am lucky enough to have most field of view options from 14mm to 3000mm covered pretty well except the 200mm range. Ask and you shall receive.......The Tpo UltraWide seems to have filled that role very well. I have only had it for a few weeks and a few outings, but so far so good. Sharpness,contrast, color,and even flatness of field... (recommended 55ish seems spot on for asi294c and asi1600m) are all very good to great. I am definitely looking forward to a lot of play with it this Summer. P.S. I don't do reviews. So this lens must be OK or I would not have bothered. George Gajdos

OPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope Review
Francis W.
United States United States
Impressions of the TPO 180

I am very impressed with this little scope. It has replaced a camera lens. I use it with a DSLR unguided. Nice round stars to the corners and star color is reasonable. Focusing is smooth and not too loose and being able to lock it with a thumb screw is nice. Here is a link to a recent image

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