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05-11-2013, 11:53 AM   #1

Join Date: Feb 2009
Location: Alameda, CA
Posts: 3,206
Lens cap for step-down "hood"

I'm a fan of step-down "hoods." I received a PM asking about lens caps. I'd like to post the answer here.

For my FA50 F/1.7 and DA 50mm Macro, I use 49-28 step-down rings. The lens cap should be 28mm (such as this eBay listing).

But I found out that a 51mm slip-on lens cap works too, especially if you can find the antique Pentax metal cap.

Any of the caps shown in this photo will work.

Note 1: For focal length of 50mm, using a 49-28 step-down ring will limit the max aperture to F/1.8 because 50/28 = 1.8. There have been threads discussing this.

Note 2: I use a 49mm empty ring (a 49mm filter with the glass removed) between the lens and the step-down ring.

Last edited by SOldBear; 05-11-2013 at 12:07 PM.
05-11-2013, 02:35 PM   #2
hcc's Avatar

Join Date: Nov 2009
Location: Brisbane, Australia
Photos: Gallery | Albums
Posts: 3,623
Could you elaborate about the pros and cons of "step-down hoods"? Thank you in advance for sharing your experience.

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49mm, 50mm, cap, caps, k-mount, lens, lens cap, note, pentax lens, slr lens, step-down
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