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05-02-2013, 12:41 PM   #16
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QuoteOriginally posted by MSL Quote
Aha! I think you've stumbled on one reason why this feature is limited. I suspect for too many lenses the rear element comes too close to the mount so you couldn't use this feature without having to rethink how the lens focused to inifnity.
You could conceivably place it anywhere in the light path. For instance, with the Da21 they placed it right at the front, and removable too!

05-02-2013, 06:23 PM   #17
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QuoteOriginally posted by Lowell Goudge Quote
fore those keeping count, it is present on the K105/2.8, K135/2.5, K300/4 and M100/4 macro in my collection of lenses

not present on any shorter lenses like K50/1.4, or M35/2

i suspect as others have opined that the rear element is too close to the mirror box and due to the size of the rear element, the shioeld would likely lead to vignetting.

on most other wide angle lenses in my kit, the rear element is so small, there should be no light requiring such a shield any way.
The rectangle window on the back of the lens is also found on my FA 28-70/4.
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