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04-08-2011, 07:21 AM   #1
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Focal length with a teleconverter

Just checking. If I am using a 2x teleconverter with a 50mm A lens, it asks for focal length. I would input 100 at this point, correct?

Thank you

04-08-2011, 07:55 AM   #2
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Yes, 100mm.
04-08-2011, 08:07 AM   #3
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itg is correct. Here's how it works. Shake reduction is different depending on focal length, there is more correction the longer the focal length. Since you have 50mm lens and a 2X TC, you are essentially working with a 100mm lens, and you will need SR to match. If you were using a 1.4 TC you would dial in 70, and if you are lucky enough to own the Pentax 1.7 TC you would dial in 85.

NaCl(hope that helps)H2O
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