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11-30-2013, 11:28 AM   #1
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Ricoh and 52mm filters

How curious that I am reassembling a kit with newer Pentax lenses, and 52mm is the filter size on the DA 50/1.8 rather than 49mm. I have a decent collection of 52mm filters, primarily because my old Rikenon lenses used them (28mm, several 50mms, 35-70 and 70-150 zoom). Something about Ricoh and that filter size...

11-30-2013, 12:23 PM   #2
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QuoteOriginally posted by jimr-pdx Quote
How curious that I am reassembling a kit with newer Pentax lenses, and 52mm is the filter size on the DA 50/1.8 rather than 49mm. I have a decent collection of 52mm filters, primarily because my old Rikenon lenses used them (28mm, several 50mms, 35-70 and 70-150 zoom). Something about Ricoh and that filter size...
I believe 52mm was always much more popular than 49mm - not just a Ricoh-specific feature.
11-30-2013, 05:08 PM   #3
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QuoteOriginally posted by jimr-pdx Quote
How curious that I am reassembling a kit with newer Pentax lenses, and 52mm is the filter size on the DA 50/1.8 rather than 49mm. I have a decent collection of 52mm filters, primarily because my old Rikenon lenses used them (28mm, several 50mms, 35-70 and 70-150 zoom). Something about Ricoh and that filter size...
In the later SMC Takumar screw-mount days 49mm became the standard Pentax filter thread. With the introduction of the K-mount and "K" Series lenses in 1975 it went to up 52mm. Pentax then went back to 49mm with the smaller "M" series a couple years later.

Phil.
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