Darn, hit the send key too quickly. The rep is full of it. Most of the reps you run across know very little and pretend to know much more. Basically imbeciles that can talk well. The loose front element should not be. The lens is a Planar type and there is no such thing as a loose element in that design. Even the Hassy floating element system in several lenses was not "loose." Sent it in to Canon. As to your test, would love to see the results. Personally, I never thought the Canon Macro was great. I opted for the Tamron 90mm (sharper), the Sigma 105mm (as sharp as the Tamron but longer but has lousy bokeh) and now the Sigma 70mm which is the best I have had. I would still be in terested in how you mounted the Nikon on a Canon EOS. But if it works for you, use it. I would love to find a Kiron 105mm F2.8 in any mount that can fit the EOS. As I said that was the sharpest macro I've ever used. And yes, I have used the Nikon 105mm. Incidentally, yours is better than the new VR version. Peter K
I got the 105/4 Nikkor when it came out, and later the 105/2.8. The 105/4 was definitely better, if slower. I haven't tried the AF version. When I got unhappy with the 2.8 Nikkor, I got the 105/2.8 Kiron (mid-80's, I guess). The Kiron is as good as the f/4 Nikkor.
I now use the 100 USM Canon which I like; I also still use the 105/2.8 Kiron on the Canons, which is excellent but not hugely better than the Canon. One Canon macro which is better than the 100 is the 60 EF-S. The 50/2.5 definitely is not in the same class, and I wouldn't bother with it.
I like macros; I have and use a 65mm/3.5 Elmar, 55/3.5 Nikkor (last version before the 2.8), and a 38/3.5 Olympus, 60/4 Zeiss Orthoplanar-S, as well as 25 through 120 Photars on a Leitz Aristophot.
All of this stuff can have a Canon body behind it. Adapters to use most brands on Canon EF are readily available.
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