Quote:
Originally Posted by erick
As in eyepieces made by Televue.
If I have read correctly, the range in mm of focal length is:- 2.5, 3.5, 5, 7, 9, 11, 12, 13, 16, 17, 20, 22, 26, 31.
Surely the differences between, say, 11mm, 12mm and 13mm are so small I cannot see why there needs to be all three? Why a 16mm and a 17mm?
Am I missing something here?
Eric  |
Yes, I think that you are...
Within the "Nagler" line are also different configurations of lenses that share/aspire to other criteria....the Nagler brand is known for the 82 degree FOV...within that are the T6, T5 and T4 series. Each of these series has different characteristics such as eye relief...the 16 T5 and 17 T4 are very different animals indeed as are the 11 or 13 T6 versus the 12 T4.
Each of them have different aspects which are maximized/targeted/scope type...while I am not saying that you need them all, I would say that after you get a chance to try the different types you will have a better understanding of the virtues of each type and why there appears to be so many.
Clear Skies and Happy Holidays!