| Joined: | Fri Apr 13th, 2012 |
| Location: | Kitchener, Ontario Canada |
| Posts: | 571 |
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I will try a 1.4x converter which will give 840mm @ f/8 to see if things start to get mushy.
The Sigma has a lot going for it but is also an older design with no stabilization and weighs >5kg.
There is also the Vivitar 800mm Mirror Lens f/8 for Nikon at less than $300 and it has way less bulk <1kg.
Last edited on Tue Feb 25th, 2014 12:58 by amazing50
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There is nothing worse than a sharp image of a fuzzy concept ;~) Mike Grace