I had fun making some calculation ... sometimes I do need big lense, so far
I only have slow mirror lenses...
I am planing on buying my 1st fast lense this year sometime... here is what
I found out...
the lenses calculated:
2000 F13.5
1200 F8
600 F4
400 F2.8
Results:
------------
the best light at 2000mm is the
F13.3
600 F4 with a 3.33x TC
1200 F8 with a 1.67x TC
F13.5
2000mm F13.5
F14
400 F2.8
My Conclusion:
I will probably get myself a 400mm F2.8 as the 1st big lense for my
collection, then the 600mm, and other if ever I get rich...
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