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12-20-2011, 03:19 AM   #1
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Jonathan Mac's Avatar

Join Date: Apr 2009
Location: Madrid, Spain
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DA 35mm macro stationary element

I just noticed something weird. Unlike every other (non internal focusing) lens that I own, the DA 35mm macro ltd has a stationary rear element that does not move with the other optics when focus is changed. I'm intrigued.

Why is this? Is it because it's a macro lens? Does this bring any benefits to the optical design?

12-20-2011, 05:16 AM   #2
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Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
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This is a Fixed Rear Element design like the old K28/2. The fixed rear element is part of the focusing design which results in a reduction in focal length when focusing in close, this is a benefit to a macro to keep it small, but it means that the working distance would be shorter for any magnification ration than a true 35mm. You can test the lens to see the reduction in focal length as you get close
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