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Ahmad -the 8" newt can be used for photography & visual - though when taking photos with a f5 newt you will get something called coma - an optcal aberration which distorts some stars off axis.. you can buy a coma corrector but it costs >200.
The ed80 will be easier to take photos with, du to the shorter f/l - mount errors will not be as apparent and you will not have to align as precisely.
I have a 6" newt for visual & photos - though it is probably not great at either - but i did not want the expense of buying different combinations.
For photography i am concentrating on prime lenses of 135 & 200mm.
I think the 8" will be ok - but the photography side will take a lot of patience - and you can update in the future (mount first)
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