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Old May 30, 2011, 12:13 PM   #11
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I have the Sigma 50-150 HSM II f 2.8 apo lens and it seems to get along quite well with my A-550. I have read here where repeated and rapid zooming can cause problems in dusty conditions. Possibly acting as a bellows to pull crud into the lens and camera body. The focus for the Sigma is much faster than my Beercan and the addition of the 1.4 TC gives me an easy to handle 70-210'ish f 4 with no apparent loss (at least to me) of auto focusing speed.

JimC is correct when it comes to TC issues with Minolta lenses. I had a box full of Minolta APO lenses scanning the timeline of production from beginning to the early 90's and started selling them for new lenses as trying to remember what worked with what (or not at all) became a bigger pain that I was willing to deal with. I sold a Minolta 2x TC on E-Bay that worked fine on my 300mm f 2.8 but did not work on the same model lens owned by the buyer. (About eight months apart in production)

If I am remembering correctly there was a thread where it was stated the Sigma TC might have function issues between lenses as well. Something along the lines of a TC that worked with the 70-200 did not function when used with the 120-300. Mine works fine with both my 50-150 and 70-200. The 120-300 from Sigma has been announced but is not yet available for the Alpha mount so I could not speak to that at this time.

Steve

Last edited by Old Boat Guy; May 30, 2011 at 12:16 PM.
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Old May 30, 2011, 12:53 PM   #12
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I think I am in the ball park now.
I got the Sony A580 and it high ISO capabilities by far exceed the A700.

With the A700, anything over 800 ISO was pretty much unacceptable to me.

With the A580 and using the Tamron 28-75mm f/2.8, and the Zeiss 85mm f/1.7 I shot everything at 1600 & 3200 ISO.

I printed a couple of 3200 ISO 8-1/2 x 11 shots which came out very nice.

Now I need a ton of practice on aiming and composure. Ya don't get a lot of time here to plan your shot.

I re-sized a few using FS Viewer to post here. Hope the exif data shows.
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