| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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The best thing will be to try it but while it MAY be OK on a bright day, here in the UK in 'normal' light I think it may be a bit slow.
But you normally use a 300 f4 with a 1.7TC don't you? That must be some way north of f5.6, so you may be in familiar territory...
The 400 will give you the equivalent framing of a 600 on a DX body, compared with (300 x 1.7 = 510) x 1.5 = 765mm with a 300 + 1.7TC.
A better bet might be a 500 Sigma, Eric had one and it was superb. That would give the equivalent framing on a DX body of 750mm with no TC.
What are you trying to achieve with the 400? Saving weight, or simplicity? The IQ you have is very good so I don't see improving on that with a Sigma. I briefly had a Sigma 400 f4 I think but it may have been a 5.6. I will try to check that.
I took some test images but I can't find them, will have a dig, I may have ditched them during a clear out.
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Robert.