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09-24-2009, 01:51 PM   #1
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Come. Look inside!

Today my work took me X-raying some automotive sensors. Whilst there I couldn't resist getting a couple of images some of the lenses I had in my bag.

So here they are --


A Pentax SMC A50mm f1.7 at 136kv & 90mA


A Pentax SMC FA28-70mm f4 AL also at 136kv & 90mA


and rolled 90 degrees

Thought y'all might be interested.

Cheerz MZ

09-24-2009, 02:06 PM   #2
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Very cool! Thanks for posting!
09-24-2009, 02:29 PM   #3
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Wow! Thanks!
09-24-2009, 02:34 PM   #4
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You know, the right lung look a bit hazy. We better start some antibiotics.

09-24-2009, 02:43 PM   #5
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SO it's true it's not just the front and back element inside that 50mm barrel... I've always doubted them
09-24-2009, 02:45 PM   #6
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Big rep for whoever engineers those things.
09-24-2009, 02:47 PM   #7
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Awesome!
Thanks for showing us.
09-24-2009, 02:56 PM   #8
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nice ones, just shame you didn't have more lenses with you
thanks for posting these

09-24-2009, 05:45 PM   #9
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QuoteOriginally posted by Nubi Quote
You know, the right lung look a bit hazy. We better start some antibiotics.
09-24-2009, 07:00 PM   #10
Voe
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Gotta love the thick lens elements of the A50mm f/1.7. Thanks for posting these. Whish you could do all the FA limiteds as well
09-24-2009, 07:52 PM   #11
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So cool to see them from this perspective!...:d
09-24-2009, 07:54 PM   #12
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I seriously suspect a case of swine flu here.
09-24-2009, 11:07 PM   #13
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Have you noticed there are two molded lenses in the 28-70mm, when rear element is darker, front one show very light density comparing the rear one, that shows they made up from very different glass/material.

I am sure rear one is made of regular glass we see as the back and front elements. But front one density is quiet low, looks like it is made of very light material almost like an acrylic. (shown with arrow)

Does anyone know what is made of? Thats interesting.
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09-24-2009, 11:15 PM   #14
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QuoteOriginally posted by cbaytan Quote
I am sure rear one is made of regular glass we see as the back and front elements. But front one density is quiet low, looks like it is made of very light material almost like an acrylic. (shown with arrow)

Does anyone know what is made of? Thats interesting.
that would most likely be a hybrid aspherical element. most mass produced modern lenses have them, some manufacturers in the bottom the barrel lenses use completely plastic ones, then there are plastic cemented onto a glass surface which are more effective (these are the hybrid aspheric), and then there are lenses that have glass moulded aspheric elements which are more expensive and more effective at correcting various aberrations and then lastly and most expensive is the ground aspheric which is when a glass blank is ground down to it's final shape by lapidary techniques employed by machines, then polished and multicoated and assembled into a lens.

the Pentax 31mm f/1.8 limited has a glass moulded aspherical element in it's optical formula

Last edited by Digitalis; 09-25-2009 at 08:10 AM.
09-25-2009, 02:45 AM   #15
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Cool!

Thanks for sharing!
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