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Hi Alex,
Thank you very much for your answer and reply, that is what i need or wait, thanks a lot.
Let me comment in points too so you may need to add something later or not up to you.
1. I am deciding to keep this 6" For Photography/Imaging only, i don't need to make things complicated by putting it for many tasks, i will give it a try anyway.
2. In fact with all those negativity or cons about F/4 i felt like it is a BIG mistake to buy an F/4 Newt or even faster, i don't know what people can do about F2.8 Epsilon for example or some new products with F3.2 Newt? So i try to give it a try and see, and i want o know what kind of modification you are talking about that can hold the collimation that long or it behaves, it will be a big appreciate if you can tell me how or what.
3. I already bought a coma corrector before in the past, to be used with my 8" F5 Newt, it is an F/4 Aplanatic CC, so a great one, i can think about Paracorr later in future as so many told me this is the top quality or correctors out there, it has that Barlow effect, i did read about correctors so i do have the idea, and i know you mean about back focus, i will work on that, it won't be easy task but it won't be an atom producing as well, the fun is in the challenge and the success.
4. I bought this one after i saw enough results and images by others with this kind of scope, i also used calculations from sites for the combo of telescope and cameras, and with the camera i have for certain targets i felt like i want something in between 550mm up to 700mm at most, and i found that 600mm is just that right and perfect, and if i use a reducer i may go little wider than 600mm, and if i use the Paracorr that will give me a slightly longer FL, so 600mm is like a sweet spot i was thinking about, and with F4 it is also flexible, it is just when i asked i felt people are against F4 or 6" F/4 in general.
Thanks for your answer, this is what i need so i keep going and learn more, i really can't wait to use my 8" F5 first and/or 6" F4 with it time to time according to targets i aim at.
Tareq
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