I have just purchased a 10" GSO RC and need a field flattener for this scope to use in conjunction with my 11002 CCD.
With the 8" I could get away with using the Tak 35 flattener and a smaller CCD of course.
The full frame CCD will no doubt cause some vignetting around the image when using the 35 flattener at a 150mm separation from the CCD.
I don't know of any FF that is any bigger or can be used in conjunction with the Feathertouch 3" focuser.
Even something which is 2" but requires much less distance to the CCD.
Thanks everyone for the array of correctors. I have taken the punt on the APM version and some adapters and will let you know how I get on.
Many Thanks
Doug
That flattener James suggested looks like a better option as it is purpose built for the RC 8 and 10 and supports up 45mm image circle. Only 109mm BF needed and Same mob make them (TS). Teleskop shop is good to deal with as well but you will have to email them and they will give you their paypal account details.
A very nice image James. I may be wrong but I still notice a considerable amount of distortion that looks like field curvature to me from about 50% out to the corners. Do you think its curvature or something else?
I'm also looking for a good flattener for an RC8 (I don't mind if its a reducer too though)
Dave
My image by no means perfect and with such a large chip it's quite difficult to get good collimation. I also believe you will always need to crop the extreme corners with the flattener. Having said that, the image scale works in your favour, making all the stars look smaller.
If you are using a smaller chip, then the task would be much easier.
James
That flattener James suggested looks like a better option as it is purpose built for the RC 8 and 10 and supports up 45mm image circle. Only 109mm BF needed and Same mob make them (TS). Teleskop shop is good to deal with as well but you will have to email them and they will give you their paypal account details.
Mark
Thanks Guy's I have ordered the 2.5 inch FF and will see how it goes. The big problem is the distance from the CCD to the FF which in itself may tend to cut off the light cone. I have ordered some adapters but will have to get some custom tube work done when I have been able to test it and get some accurate measurements. I am not a real believer in stated distances and find often they can be set up better.
