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Originally Posted by psquared
Roger,
I had the older 280/2.8 and modular 280/2.8 simultaneously for about a day. I did run some direct comparisons, but not an extensive series. I thought the two were very similar. If anything I would give the resolution edge to the newer model. I do agree that the 400/4 configuration is excellent. Definitely beats the 280/2.8 (either model) + 1.4X APO extender. If your 280mm head works well with the 1.4X focusing module and yet you're not happy with the 280/2.8 configuration, then perhaps you should have the 1X module looked at and have it CLA'd. Do you have the 400mm head? If so, how does the 1X module look on the larger head? The 400/2.8 should be spectacular wide open. If it doesn't look that way, then the 1X module definitely has a problem.
GL,
Peter
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Excellent suggestion as I have the full set. I think Putts review indicated that the 1.4 module with the 280/400 head is best in class.. so I was trying to determine if I am expecting too much from the 280/400 and the 1X. Time to get testing. Thanks