Astro-Tech 2" Prime focus adapter, needs T-ring


Availability: More on the way

This Astro-Tech 2" prime focus adapter allows unvignetted prime focus photography with most reflectors and refractors equipped with a 2" focuser . . .
Our Product #: ATPFA
Astro-Tech Product #: FF145

Product Description

This Astro-Tech 2" prime focus adapter allows unvignetted prime focus photography with most 35mm and DSLR cameras having removable lenses that use a standard T-ring to connect to a camera adapter. It also can be used with most CCD cameras having a removable nosepiece that can be unthreaded to expose a female T-thread. It will not work with digital cameras having integral non-removable zoom lenses.

The adapter can be used with most refractors and Newtonian reflectors that are equipped with a 2" focuser, as well as with Astro-Tech Ritchey-Chrétien reflectors.

The camera end of the Astro-Tech adapter is equipped with a standard 42mm male T-thread for connection to a T-ring or the female T-thread on a CCD camera body. The barrel on the opposite end slips into a 2" focuser and is threaded to accept 48mm filters. The adapter is machined of aluminum, anodized black. The interior of the adapter has anti-reflection threading along its entire length

The prime focus adapter barrel extends 35mm into the focuser drawtube to provide a secure tilt-free installation when the focuser thumbscrew is firmly tightened. This keeps the adapter perpendicular to the focal plane for accurate focus over entire negative or CCD chip. This adapter adds only 3mm of extension to the light path when the adapter is seated firmly into your focuser. The overall length of the adapter is 38mm, excluding the 4mm of threads for attaching a T-ring..

This Astro-Tech Prime focus adapter needs an optional T-ring if it is not threaded directly into the T-threads of a CCD camera body.

Tech Details

Weight 5 oz.
Warranty 1 year


Review by:
I had originally bought this to connect my Canon DSLR t-ring to get rid of the vignetting from using a 1 1/4" adapter. Worked great and no vignetting. I then had an issue with just getting to the focal plan at the limit of my focuser using my ZWO ASI183MM camera on my AT 115EDT. I didn't want to shrink back down so I took a shot and checked the thread. Sure enough, this adapter threaded directly to the ZWO camera and gave me a secure connection and the extra little bit of focal distance needed. Very pleased that I didn't have to find and spend more on another adapter.

Thanks again Astronomics! You saved the day (or night). (Posted on 12/25/2019)
Review by:
It fit my scopes and cameras perfectly. A very handy addition to my collection of adapters and extenders. (Posted on 10/6/2018)
Review by:
This item does exactly what it's supposed too. It has a good fit without any play in it's fit.

I only use it in certain instance as most of the time I use my 2" refractor field flattener that accomplishes the same thing while also flattening the field. (Posted on 8/4/2017)
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