Astro-Tech 0.8x reducer/field flattener for Astro-Tech AT130EDT triplet apo refractor


Availability: More on the way

This economical 0.8x focal reducer and field flattener is designed specifically for astrophotography with the Astro-Tech AT130EDT 130mm f/7 triplet apo refractor.
Our Product #: ATREDT30
Astro-Tech Product #: ATREDT30

Product Description

This Astro-Tech #ATREDT30 0.8X focal reducer/field flattener is designed specifically for prime focus astrophotography with the Astro-Tech AT130EDT ED triplet apo. While it may also work well with other brands and models of f/7 refractors that use a 2" focuser, its performance with other scopes is not guaranteed.

The fully-multicoated Astro-Tech #ATREDT30 reducer/flattener converts the 910mm focal length f/7 Astro-Tech AT130EDT refractor into a 728mm f/5.6 system for faster and wider field astronomical and terrestrial photography. 

In addition to reducing the focal length of the telescope and thereby increasing the photographic speed, the #ATREDT30 flattens the normal field curvature inherent in all refractors. This provides images that are sharply focused out to the corners of DSLR and CCD imaging chips. Stars look sharp and point-like all the way across the field in your images. You don't have to worry about photos that are sharp in the center and blurry at the edges.

The Astro-Tech #ATREDT30 reducer/flattener can be connected to your AT130EDT in two different ways. The first is the most secure for extended imaging sessions. The 2" barrel of the reducer is threaded at the top, as can be seen in the feature image above. If the 2" accessory adapter is unthreaded from the camera angle adjuster on the scope, the reducer can be threaded onto the camera angle adjuster in its place for the most solid and secure connection.
In the second connection method, for casual imaging, the 2" barrel of the #ATREDT30 can simply be slipped into the scope's 2" focuser in place of your star diagonal. The 2" telescope-side barrel of the reducer is threaded for standard 2" filters and has a safety groove. 

The camera side of the #ATREDT30 reducer has standard 42mm T-threads to connect to a T-ring and DSLR camera body. A slip-on soft rubber cover protects the T-threads when the reducer is not in use, while a second slip-on cover is provided for the 2" scope-side barrel. Back focus is 55mm from the shoulder of the reducer to the image plane, the standard spacing for DSLR camera bodies. 

Tech Details

Weight 8 oz.
Warranty 1 year


Review by:
I use this on my AT130EDT and it works well. Stars are pinpoint to the edge. (Posted on 1/8/2019)
Review by:
This focal reducer/flattener is an excellent performer. While it’s designed for the AT130EDT, I can attest that it also works very well with a TMB130SS. I’ve had many hours of imaging with this optic and it’s given very clean images with very sharp stars in the corners of my imaging chip. While I don’t use it with my TMB130SS, the threaded connection on the scope side is a very nice touch, giving a rigid connection with little opportunity for tilt. Overall, I’ve been very happy with it, and would recommend it to anyone improving the images in their 130mm triplet. (Posted on 11/8/2018)
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