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Old 03-23-2012   #26
rlouzan
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Rear element, Rollei 3.5F
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Old 03-23-2012   #27
JPD
J. Patric DahlÚn
 
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Riouzan, that's the antireflection coating. Is the front element purplish?

The Planar on my 3,5F has the warm coating on the front element and the rear element has a purplish coating.

Here you can see a 2,8F with the warm coating on the front element:
http://johnsrolleionlypage.homestead...e_1._large.JPG

And this has the purplish coating:
http://johnsrolleionlypage.homestead...iew_no_cap.jpg

This was before multicoating, so the explanation may be that the warm and cold coatings would cancel each other out.
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Old 03-24-2012   #28
rlouzan
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Hi JPD,

Taking lens SN 2.986.XXX:

*Front element exhibits both a magenta and orange multi coating 'of sorts'.
*Rear element is orange-yellow, similar to the color cast of a radioactive Summicron, could be lens coating ...

However, this still doesn't explain why the rear element is completely flat, not even close to the lens cut shown in #15.

Regards,
Robert
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FS: Hand Made Leather Camera Wrist Straps
http://www.rangefinderforum.com/phot...a-wrist-straps



Quote:
Originally Posted by JPD View Post
Riouzan, that's the antireflection coating. Is the front element purplish?

The Planar on my 3,5F has the warm coating on the front element and the rear element has a purplish coating.

Here you can see a 2,8F with the warm coating on the front element:
http://johnsrolleionlypage.homestead...e_1._large.JPG

And this has the purplish coating:
http://johnsrolleionlypage.homestead...iew_no_cap.jpg

This was before multicoating, so the explanation may be that the warm and cold coatings would cancel each other out.
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Old 03-24-2012   #29
JPD
J. Patric DahlÚn
 
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Quote:
Originally Posted by rlouzan View Post
Hi JPD,

Taking lens SN 2.986.XXX:

*Front element exhibits both a magenta and orange multi coating 'of sorts'.
*Rear element is orange-yellow, similar to the color cast of a radioactive Summicron, could be lens coating ...

However, this still doesn't explain why the rear element is completely flat, not even close to the lens cut shown in #15.
The rear element is less curved than the front element, but the reason to why it looks flat is the angle you're looking from. You can't look at it from the side when it's deep inside the camera, and it will probably also feel flat if you touch it with a finger (don't, that's unecessary!). You can cut a ca 2 cm piece of thick paper and hold it with a pair of tweezers against the lens surface and see that it's not exactly flat.

I took a picture of mine, and it does look "flat", but you can see the reflections from my lightsource that they bend a little.

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Old 03-25-2012   #30
rlouzan
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JPD,

You've convinced me!
I wonder if they changed the lens coating at some point.

Regards,
Robert
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http://www.rangefinderforum.com/phot...a-wrist-straps
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