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SV193 2-Inch 0.8x Focal Reducer / Flattener for SV503 ED Refractor

SKU: W9152
1
US$ 135.99

Designed specifically for SV503 70mm, 80mm, and 102mm f/7 ED Refractor.

The field flattener corrects the inherent spherical aberration of curved lenses which causes distortion at the edges of the field of view.

The default back focus is 55mm. 70mm telescope's front end is an M54x0.75 socket to connect to the main lens.

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234567W9152A-1W9152BW9152DSpecification

1 reviews

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Definitely needed for astrophotography

Jeff on Apr 03,2023
I've got the SV503 70ED and the matching field flattener. Without the field flattener there is quite a bit of distortion outside of the center of the image. With the field flattener the distortion is moved to the very edges of the image and is very minor, leaving most of the image perfect and even if you don't crop the image the distortion is hard to notice unless you're looking for it. Back focus is critical to making this work as intended so get some small spacers to fine tune if you need to. One final note about filters - If you need to you can attach a 2" filter to the end of the field flattener designed for the SV503 70ED. You'll notice female threads on the end that attaches to the focuser and I was pleased to find that they're M48 x 0.75 - just what I needed to attach the SVBONY 2" filters. It screws in fine with the filter installed and doesn't leave you needing to change spacers to maintain proper back focus. I'm very pleased with the results I'm getting from my SV503 70ED and SV193 combo. It gives me the light weight and portable telescope I wanted.
Model SV193
SKU  W9152A W9152B W9152D
Back focus 55mm
Barrel size M54x0.75 2-inch 2-inch
Threads Standard M48*0.75 M48*0.75 M48*0.75
Lens Structure 3-Elements/3Groups 3-Elements/2Groups 3-Elements/2Groups
Lens Coating FMC FMC FMC
Blackened Lens Edges Yes Yes Yes
Net Weight  273g / 9.63oz / 0.6lb 164g / 5.78oz / 0.36lb 177g / 6.24oz / 0.39lb

Designed specifically for SV503 70mm, 80mm, and 102mm  f/7 ED Refractor.

The field flattener corrects the inherent spherical aberration of curved lenses which causes distortion at the edges of the field of view. As a focal reducer, it reduces the focal ratio of the scope which translates into wider fields of view with shorter exposure times—allowing you to capture more images in the same amount of time without sacrificing performance.

Multi-coated optics housed in high polish, and hard anodize finished aluminum body to help reduce weight. The camera end of the reducer/flattener has M48x0.75 threads to connect to the camera bayonet (Support Full Frame Camera), while the telescope side is a standard 2-inch to connect to the main lens,  also Includes a standard 2" filter thread to add the light pollution filter you need. The default back focus is 55mm. 70mm telescope's front end is an M54x0.75 socket to connect to the main lens.

Using the 360° field rotator at the end of the focuser(sold separately), you can meet your composition requirements without turning the main lens, and it's also compatible with the filter wheel/OAG/astronomical camera.

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