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Diagram scans: Hoya 80-200mm f4, Sirius 28-70mm f3.5-4.5
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PostPosted: Thu Nov 04, 2021 11:11 pm    Post subject: Diagram scans: Hoya 80-200mm f4, Sirius 28-70mm f3.5-4.5 Reply with quote

A handful of third-party lens manuals I got in a bundle also had their lens diagrams listed within, and they're not always/often online. Just forgot this subforum existed. Should be of interest/curiosity to a few people!

Hoya 80-200mm f4:



If I could hazard a guess, identical to the Tokina RMC / SZ820 80-200mm f/4, seen in the top right here: https://www.pentaxforums.com/userreviews/data/78/large/TokinaBrochure_0004-1k.jpg

(The last element's curvature and spacing is a giveaway)

Sirius 28-70mm f3.5-4.5:



PostPosted: Tue Nov 16, 2021 7:03 am    Post subject: Re: Diagram scans: Hoya 80-200mm f4, Sirius 28-70mm f3.5-4.5 Reply with quote

eggplant wrote:
. . .
Should be of interest/curiosity to a few people!


Definitely. In fact, the Sirius 28-70mm appears to be the same lens as my Sears branded copy. And my Sears has internal haze which I've been thinking about cleaning.
If I do clean it, this diagram will be helpful.