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06-13-2018, 06:22 AM   #1
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Pentax DA 21mm f/3.2 AL Limited filter options

I am confused on the filter options for this lens. Am I reading correctly that I can use either a 49mm on the lens, or a 43mm filter placed somehow on the lens hood?

So far, I have seen vague references to the hood option in descriptions.

Further explanation by those that have this lens would be appreciated.

06-13-2018, 06:41 AM   #2

Join Date: May 2016
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The hood has a thread on the inside. If you have this lens, remove the bayonet hood and look inside, you'll see a thread. If I remember correctly, when mounted on the hood the filter faces the opposite way.

When I had this lens, I only used 49mm filters with the hood removed, since they were the same size as most of my other lenses.
06-13-2018, 10:15 AM - 1 Like   #3
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The 43 filters screw onto back of the 21 hood. The 49 screws on lens but cannot be used with the hood. If using a polarizer I use 49 filter and a generic rubber hood. You canít access the internal 43 easily so itís not practical for polarizing filters.
06-13-2018, 11:19 AM   #4
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Original Poster
Thank you.


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