Kerry Pierce Offline Upload & Sell: Off
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I have both the 105 and 135 and usually leave the DC controls on the Neutral setting, but sometimes will play with them, depending on what is desired. Seems to me that properly using the DC controls will give rather subtle changes, but their use can also be rather dramatic, even overly so. Too much info to put here, even if I could write a completely lucid piece on their use.
There are several articles on the web that deal with both DC lenses, in depth. I can't offer any links, but I know that they can be found with a couple of google searches. When I know that I have a shoot where I can use these lenses and will have time to play, I seek out those articles for a refresher course.
I love the DC lenses, precisely for the reasons you mention, but they seem to have a love/hate relationship with many users. Lots of folks just don't want to mess with them. Personally, I love the output and that's all that's important to me.
BTW, I also have the Sigma 150 and have never chosen to use it for portraits over the 135 DC. It's a fine lens, but it doesn't draw the image like the DC's can.
good luck, sorry that I can't be more precise.
Kerry
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