Prime focus adapter and EOS t-thread...

[Astroman (Andrew Wall)]

Hi all,

I am thinking of getting these two adapters for my canon EOS 400D, would these be suitable for prime focal astrophotography and how do you keep dust out of the adapter? is there a special lens?

https://www.bintelshop.com.au/Product.aspx?ID=5551

and....

https://www.bintelshop.com.au/Product.aspx?ID=7182

Is there a way to work out what FOV I would have with the cameras Cmos chip prime focus through an 8" f6 scope?

[Striker (Tony)]

I use starry nights to find out fov with different equipment and camera's.

I know you will want to do it yourself but here is your set up fov on the horsehead....The blue square.

[Astroman (Andrew Wall)]

Thanks Tony, yeah I just worked out the size of the chip etc.... at f6 it sure is tight