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06-28-2020, 07:30 PM - 1 Like   #1
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Lens Construction Diagrams Sought

Yes, I have already checked then database here at Pentax Forums

The following is a partial list is from a site that claims certain patents correspond to Pentax brand lenses.
Before accepting a patent as corresponding to a lens I match the patent optical prescription against the manufacturer lens construction diagram.
Clearly, to do that I need a diagram!

If you're curious to see some of the matches already available you can visit the PhotonsToPhotos Optical Bench Hub
(which in turn opens the Optical Bench with the selected lens.)

Here's my wish list:
SMC Pentax-Q O3 Fisheye 3.24mm f4.8
SMC Pentax-Q O4 Standard zoom 5-15mm f2.8-4.5 (8:7)
SMC Pentax-Q O1 Standard prime 8.5mm f1.9
SMC Pentax-DA 12-45mm f3.5-f4.5 APS-C
SMC Pentax 20mm f1.4
SMC Pentax 24mm or 28mm (8:7 or 9:8)
SMC Pentax 24mm or 28mm f1.4 (9:7)
SMC Pentax-F 35-105mm f4-5.6
SMC Pentax-M 35-135mm (12:9)
SMC Pentax-DA 35mm f4 (8:6)
SMC Pentax-A645 45mm f2.8
SMC Pentax-F 60mm f2.8 or f4 SOFT (4:2)
SMC Pentax-FA 100mm f2.8 (6:6 or 7:7)
SMC Pentax-A 100mm f2.8 macro (9:8, 8:7 or 7:6)
SMC Pentax-A 200 f4 (6:6)

Thanks!


Last edited by bclaff; 06-28-2020 at 08:35 PM. Reason: Updating the list
06-28-2020, 07:47 PM   #2
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Have you looked at K-Mount Page? Here for instance is their Lens Diagram for the FA24~90/3.5~4.5 AL IF (13-11). (GC=Ghostless Coating, mentioned, but not the official name). They should have a diagram for virtually every K-mount lens actually produced (excluding prototypes.e.g. M35/1.4)


Last edited by monochrome; 06-28-2020 at 08:08 PM.
06-28-2020, 08:08 PM - 1 Like   #3
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QuoteOriginally posted by monochrome Quote
Have you looked at K-Mount Page? Here for instance is their Lens Diagram for the FA24~90/3.5~4.5 AL IF (13-11). (GC=Ghostless Coating, mentioned, but not the official name). They should have a diagram for virtually every K-mount lens Actually produced (excluding prototypes.e.g. M35/1.4)
I did not look at that separately. Thanks for the "heads up"

Found 11 so far. I had been there before but didn't realize the extra click to see the diagram (although some are very small).

10 of the 11 look promising. Thanks again.

Last edited by bclaff; 06-28-2020 at 09:17 PM.
06-28-2020, 08:11 PM   #4
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QuoteOriginally posted by bclaff Quote
I did not look at that separately. Thanks for the "heads up"
Neat project!

06-28-2020, 10:19 PM   #5
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If you are serious about this and you can show benefit to Pentax, ask Pentax. A good reason would be a written lens compendium. It would be difficult to identify who to approach, but that would be the best way for all.
06-29-2020, 01:01 PM   #6
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QuoteOriginally posted by bclaff Quote
Yes, I have already checked then database here at Pentax Forums

The following is a partial list is from a site that claims certain patents correspond to Pentax brand lenses.
Before accepting a patent as corresponding to a lens I match the patent optical prescription against the manufacturer lens construction diagram.
Clearly, to do that I need a diagram!

If you're curious to see some of the matches already available you can visit the PhotonsToPhotos Optical Bench Hub
(which in turn opens the Optical Bench with the selected lens.)

Here's my wish list:
SMC Pentax-Q O3 Fisheye 3.24mm f4.8
SMC Pentax-Q O4 Standard zoom 5-15mm f2.8-4.5 (8:7)
SMC Pentax-Q O1 Standard prime 8.5mm f1.9
SMC Pentax-DA 12-45mm f3.5-f4.5 APS-C
SMC Pentax 20mm f1.4
SMC Pentax 24mm or 28mm (8:7 or 9:8)
SMC Pentax 24mm or 28mm f1.4 (9:7)
SMC Pentax-F 35-105mm f4-5.6
SMC Pentax-M 35-135mm (12:9)
SMC Pentax-DA 35mm f4 (8:6)
SMC Pentax-A645 45mm f2.8
SMC Pentax-F 60mm f2.8 or f4 SOFT (4:2)
SMC Pentax-FA 100mm f2.8 (6:6 or 7:7)
SMC Pentax-A 100mm f2.8 macro (9:8, 8:7 or 7:6)
SMC Pentax-A 200 f4 (6:6)

Thanks!
I'm curious what criteria you used to come up with that list?
06-29-2020, 01:18 PM   #7
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QuoteOriginally posted by bclaff Quote
I did not look at that separately. Thanks for the "heads up"

Found 11 so far. I had been there before but didn't realize the extra click to see the diagram (although some are very small).

10 of the 11 look promising. Thanks again.
Sorry I forgot to mention that. Iíve spent a lot of time on that site over the years researching SMCP (K) lenses.

Glad you figured it out!
06-29-2020, 02:27 PM   #8
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QuoteOriginally posted by house Quote
I'm curious what criteria you used to come up with that list?
The site I'm looking at has a list of lenses with their supposed corresponding patent.
That's a list of those lenses for which I have no construction diagram and therefore cannot verify that the patent in fact corresponds to the lens.

06-30-2020, 09:29 AM   #9
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Murphy's Law

QuoteOriginally posted by monochrome Quote
Have you looked at K-Mount Page? Here for instance is their Lens Diagram for the FA24~90/3.5~4.5 AL IF (13-11). (GC=Ghostless Coating, mentioned, but not the official name). They should have a diagram for virtually every K-mount lens actually produced (excluding prototypes.e.g. M35/1.4)
It's interesting that you chose that example.
That's the first construction diagram I have had to repair (that gray "element" is messed up).

Here it is overlayed with the optical prescription from the patent (hard to see because the overlay is quite good):
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