The Telescope Authority
Since 1947

View Shopping Cart

Your Cart is Empty

TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope

SKU : OS-TPO-180

- Read
  • In Stock

Add to Wishlist

Got questions? Click for live chat

  • 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.


    IC 1396 - the Elephant Trunk Nebula by Drew Evans with the TPO UltraWide 180, a ZWO ASI 1600MM, and Astronomik RGB + 6nm Ha 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 DesignApochromatic Triplet with Dual ED Elements
    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
4.6 Based on 11 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Cody W.
United States United States
Beast of a little scope!

Just came in from my first night with it. Easy to focus, light, and a workhorse. Stars stayed sharp all the way to the edges, and pulled some great data in only 2 hours of imaging Sadr. Will be posting a YouTube video review. Highly recommend.

OPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope Review
United States United States
Loving this Scope

Great color and resolution. Simple to setup and use. Love the easy it is to adjust and lock the focus. Came with all adapters I needed to connect and set back focus. Just had to add 2" UV/IR filter to the front of it and it was ready to use. Being extremely small and light makes for a great portable solution when pared with a small tracker.

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
Terry D.
United States United States
AMAZING little scope

I was a bit skeptical at the small aperture, but this little lens is terrific. Colors are true and it has resolving power that belies its small size. In short, i am delighted with this small but powerful addition to my astro imaging arsenal.

Louis .
United States United States
Good light weight option

Getting the cons out of the way first. Back focus was difficult to achieve and unforgiving. I ended up having to 3d print m42 spacers to get the back focus to a usable spot. Even with the back focus set correctly, getting the focus perfect is a bit of a chore as well, even with a bhatinov mask. Ultimately, I chose a target like the trapezium in Orion to fine tune my focus. There does seem to be CA around some larger stars, but I say that in the context of having struggled with the focus itself. That all being said, I really like the scope. It's a perfect light weight option for smaller mounts like star adventure. This is especially true if paired with cameras with small sensor size (think 3x-5x crop factor). This is still wide field enough to frame larger nebula such as M42. The field is flat, with no coma or vignette for these sensors. I have not tried it yet with a DSLR to test the coverage on a larger sensor. I have attached a photo of m42 taken with this scope, a ZWO asi 178 (uncooled/color), and star adventure mount (guided).

OPT Telescopes TPO UltraWide 180 f/4.5 Astrophotography Lens & Guide Scope Review
United States United States
Great little scope, needs solution for mounting finder/guidescope

This is a really well-made, beautiful little triplet. I'm excited to have a ultra-small widefield to attach to my dslr. HOWEVER the scope would be much easier to set up if manufacturers offered a stock solution for attaching a finderscope or guidescope. It could even be just offering a second set of stock rings for sale as an add-on peripheral. Great scope!

Don C.
United States United States
Solid Performer

I purchased the TPO UltraWide 180 for wide-field CCD photometric studies. I also wanted the small aperture and wide field as a frontend for an Optec SSP-5a photoelectric photometer for bright star work. The optics are top-notch and have performed better than advertised in both instances. The only reason this rating is 4 stars and not 5 are the tube rings. It would be infinitely better if the rings had three thumbscrew adjustment points instead of just two. Two adjustment points makes it very difficult to perfectly align it with the main telescope when coupled with the SSP-5a in my case, or if using it for off-axis guiding. I'm in the process of modifying the tube rings to utilize 3 adjustment screws with Delrin tips.