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11-17-2013, 06:24 AM   #1
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smc DA lens diagrams

Somewhere on a pentax website there is a brochure called Lenses and Accessories.
On page 28-29 there are some nice drawings of the lens layout i the DA lenses.

I have uploaded the drawings for easier access here: Pentax smc DA lens construction from pentax brochure - Imgur

Some of the elements are brown, green or blue. I think blue means ED and green aspherical.
There are brown elements in the 55mm and 18-55mm - anyone knows what they are?

I like these kind of schematics. Are there similar collections of drawings for other lens series?

11-17-2013, 07:12 AM   #2
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Nice, especially the downloaded versions, which are nice and big. Thanks
11-17-2013, 09:09 AM   #3
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Quite funny how 16-50, 17-70 and 18-135 all have basically the same complex setup.
11-17-2013, 09:32 AM   #4
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QuoteOriginally posted by olepap Quote
Are there similar collections of drawings for other lens series?
Bojidar Dimitrov has quite a comprehensive collection
(click on the "Optical Formula" link
in the write-up for each individual lens):

Pentax K-Mount Lenses and Lens Accessories

11-17-2013, 11:46 AM   #5
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QuoteOriginally posted by lytrytyr Quote
Bojidar Dimitrov has quite a comprehensive collection
(click on the "Optical Formula" link
in the write-up for each individual lens):

Pentax K-Mount Lenses and Lens Accessories

Thank you. I had never noticed those links before.
And whitemetal.com has alot of m42 lens diagrams.

I also noticed how similar the wide angle zooms are compared to the telephoto zooms. I thought longer focal lengths were simpler, and therefore would look more like each other.
06-07-2016, 12:24 AM   #6
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QuoteOriginally posted by olepap Quote
Somewhere on a pentax website there is a brochure called Lenses and Accessories.
On page 28-29 there are some nice drawings of the lens layout i the DA lenses.

I have uploaded the drawings for easier access here: Pentax smc DA lens construction from pentax brochure - Imgur

Some of the elements are brown, green or blue. I think blue means ED and green aspherical.
There are brown elements in the 55mm and 18-55mm - anyone knows what they are?

I like these kind of schematics. Are there similar collections of drawings for other lens series?
On the DA* 55mm diagram in the Pentaxforums database the element is yellow not brown. It is Extraordinary low dispersion glass.

Unfortunately, the color scheme is used inconsistently by Pentax (Ricoh) and varies from publication to publication.
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