I'm thinking about changing over to
WOW that's quite a set up you have there but just the opposite of what I'm after. I don't want to step up from M42 to M48.UlteriorModem wrote: ↑Wed Nov 27, 2019 4:28 pmI am using the QHY CCD OAG with my Ritchey Chriten.
You will have to do some head scratching and calculating for the various adaptors and extension rings. The hardest part is getting the focal plane of the guide camera and the imaging camera EXACTLY the same!
Here is a sketch I did to calculate the spacers and adaptors. This was with a filter wheel and a ATIK 3983L+ ut the concept is the same. Note the calculated 9mm spacer for the guide camera.
20171213_202910 by Tom Whit, on Flickr
Here is a link to the users manual that helps explain some of it.
https://note.youdao.com/ynoteshare1/ind ... &type=note
Here is an image of my current set up with a focal reducer included. The filter threads on to the front of the focal reducer not shown here.
ver 2 by Tom Whit, on Flickr
I'll check out the links you provided. My telescope isyobbo89 wrote: ↑Wed Nov 27, 2019 4:41 pmAre you using a field or comma corrector ?, what is your imaging focal length, oag are great for removing differential flexure and are good to get the right guiding resolution , but they have a few flaws.
I have a t ring for a mirrorless sony a 7, pretty sure the as6000 is mirrorless as well, the t ring i have has a 42 mm female thread, with a recess that can be removed to make it a 48 mm female.
This oag has the 42 mm male and a 48 mm male thread to go into a sony or typical 42 mm t ring.
http://www.sirius-optics.com.au/zwo-oag ... uider.html
now if you need room for a comma corrector, orion sell a thin version , but you'll need some sort of lower profile t-ring, assuming you have a similar one that i have that machined to fit 55mm back focused correctors.
https://www.bintel.com.au/product/orion ... PoEALw_wcB
here is the " t-minus' t ring for sony, you may be able to fit a slim oag and a coma corrector with it.
https://www.telescopeadapters.com/t-min ... eries.html
Neither does the Ritchey Chriten. That's a focal reducer. See thethat doesn't require require comma corrector.