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its just the size davo. 7.5mm and 15mm... I dont really go in between much. I do sometimes tho, so dont get me wrong there... it does get used.
as for TV vs ultima, I dont have a 7mm TV to compare the ultima to. I understand they are of simalar quality tho and it comes down to preference. I have seen someone on here post that the TV felt too "warm" in comparison, I have no idea what this means.
if the seeing isnt up to the 7.5 i'll opt for the TV 10.5 tho... or just not look at planets... you know its funny but last night i used the TV 10.5, ultima 7.5 and series 500 6.5 and the 6.5 gave almost as good views as the ultima! just as sharp but not quiet the contrast... weird
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