Thanks mate, it sounds a lot better than my standard M42>EOS.
I was messing around with my Carl Zeis 135mm the past few days, its another great golden oldie 
All of these shots are 100% crops.
This is taken with my Sigma 17-70 at 17mm F2.8 (wide open)
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This is the Sigma 17-70 at 70mm F4.5
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Now for the oldies!
This is the Carl Zeiss 135mm F3.5 (wide open)
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Now the same lens with a 2x TC
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The TC naturally degrades the image, but its got quite a long reach now.


