can extension tubes be used for Sigma APO 70-300mm F4-5.6 DG MACRO lens? will it produce superior results than using just the lens?
this lens produce magnification of up to 1:2. can i have 1:1 by using the tube
General answer: Yes, extension tubes can be used on ANY lens if the mounts match. The only thing an extension tube does is allowing the lens to focus even closer than it would without them.
No optical degradation will be observed since the extension tubes do not bring any other medium (another glass) in front of the image. It is just air.
drawbacks are that not all of the extension tubes support through the lens metering and/or autofocus. So you might have to run manual.
Edit 1: Yes, you can have 1:1 magnification with the tubes. If you check, for example, Kenko extensions tube, they include a guide so you know what magnification you can achieve with each of the tubes independently or by stacking them.
I am also sure they will let you try them out at the store... Good luck!
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