Focal reducer for 152mm f8 refractor?

[RKBERTA]

I am looking for focal reducer/flat field lens for a 152mm APO F8 REFRACTOR.  Will use with 4/3 sensor camera. Any recommendations? I already have a flat field optic but need around .8 reducer.

[pmlogg]

Perhaps the large Riccardi 0.75 reducer from APM, sold by several UK astro kit supplies.  It comes in  Large (M82 thread) and Small (M63 thread) versions.   Adapters are available but can be a bit pricey.  Someone is selling a used M82 threaded one on Astrobuysell.  That is what I use with my similar spec refractor.

[Coolhand1988]

20 hours ago, RKBERTA said:

I am looking for focal reducer/flat field lens for a 152mm APO F8 REFRACTOR.  Will use with 4/3 sensor camera. Any recommendations? I already have a flat field optic but need around .8 reducer.

If you can post the brand of your refractor?

It's most likely they will have a dedicated reducer for your purpose and to avoid vignetting on certain sensor sizes and other errors.

If not, TS-Optics have a large selection to cater for different brands of scopes and have a medium size budget as well.

Thanks