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Hi,
Has anyone tried this combination at all with Canon, Sigma or any other 1.4x?
The website states that with the sigma 1.4x it will only autofocus down to 52cm with the Sigma 1.4x. Just wondering if other T/C's or any other tricks will allow AF right down to minimum focus distance?
I am considering getting a 1.4x as I move to camera with a bigger sensor. I also have the canon 100-400, so the canon 1.4x would be nice for that, if it works ok with the sigma 150. I understand that the canon 1.4x would need a small extension tube between it and the lens due to the protruding element. This is no major deal if the setup works acceptably.
THanks in advance for any info 
Hi. I ordered the Sigma 150 Macro for Nikon last week. It should be here tomorrow. But that's strange that the website states that. With every lens I've used a teleconverter on, the minimum focus distance stayed the same. If the lens focuses down to 38cm, then it should still be 38cm with the TC. When I get the lens, I'll try it with my Kenko 1.4X and let you know. That lens did really good in the tests by Photozone. Resolution is really high, CAs(chromatic abberations)are very low, and distortion is virtually none. And a few people on the Nikonians web site own it and have nothing but good things to say about it. If you don't have this lens and are looking for a macro, I'd buy this one. Check out the lab test.
http://www.photozone.de/8Reviews/lenses/sigma_150_28_nikon/index.htm
Thanks for the responses. I was hoping that maybe someone had discovered a way top get around it. Ah well I guess I'll have to learn to manual focus then though looking at my shots if the exif data is accurate I am not often much closer than 52cm to fill the frame with my subject anyway!
So the question is now do I go with the canon which would probably give best results on my 100-400 (and maybe in a few years time a big prime!) or the sigma which is probably best suited to my macro. Or is the quality fo the Kenko good enough for both?
)I'm sorry there's been a misunderstanding. You said it wouldn't AF closer than 52cm. I thought you meant it would not focus at all closer than 52cm. I get it now. Well, the lens came today. I tried the Kenko 1.4X on it. The AF tries to work, but it malfunctions with the teleconverter, even at farther distances. I guess one should get the Sigma teleconverter to use with that lens. By the way, the lens is sweet! I was in the yard shooting some small flowers.
I bought one off ebay with the 1.4 converter included. Not really used it in anger yet, just waiting for the dragonflies to start to emerge.
Just tried it out with the converter on both my 1D Mk2 and 5D.
It will AF closer than 52cm, but it wont do it all the time at 38cm you have no chance. To me this does not matter as MF is still king for macro work.
Don't let it put you off getting one because if you are keen on macro work you really should master MF anyway, and also the prime reason for using one is to get a bit more distance from your subject in which case you are likely to be more than 52cm from your subject anyway.
I do have a Canon 1.4 converter as well, but it wont fit the Sigma lens so don't even try with that one.
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