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I am torn between Planar 50/1.7 and Pancolar 50/1.8
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PostPosted: Thu Apr 30, 2009 7:32 pm    Post subject: Got it today. Reply with quote
Got the Pancolar today and the glass is yellowed (damn thorium) with two big dust inside...

BUT..

I couldn't resist Zeissy 3D. Laughing

Many thanks for your feedbacks.

Last edited by WallyJr74 on Thu Jul 30, 2009 4:53 pm; edited 1 time in total


PostPosted: Thu Apr 30, 2009 7:43 pm    Post subject: Reply with quote
Great capture Smile

Of course you can use the sun to de-yellow the lens.
I don't think the dust will effect images 99% of the time.


PostPosted: Fri May 01, 2009 3:31 am    Post subject: Reply with quote
Maybe...maybe not. I don't know why but I find the yellow colour very appealing. Cool





PostPosted: Fri May 01, 2009 8:40 am    Post subject: Reply with quote
I agree with you Walli. In this case the yellowing gives a good feeling to the photos.

The first one is lovely, perfect DOF and I love the comical/funny pose.

The second one is excellent portrait, again.

The third picture is technically perfect but your wife needs to work a bit on her posing skills Wink


PostPosted: Mon Aug 10, 2009 3:10 am    Post subject: Reply with quote
F16SUNSHINE wrote:
Great capture Smile

Of course you can use the sun to de-yellow the lens.
I don't think the dust will effect images 99% of the time.


Hi, could you share how to de-yellow the lens under the sun? Thanks in advance. Smile


PostPosted: Mon Aug 10, 2009 4:30 am    Post subject: Reply with quote
pentaxme wrote:

Hi, could you share how to de-yellow the lens under the sun? Thanks in advance. Smile


Hi Pentaxme, welcome to the forum!

how to de-yellow under the sun?
well, simply expose it to the strong equatorial sun of Singapore and watch that no tropical rain catches it Wink

I believe that really is all there is to it: expose it to sun with the caps off


PostPosted: Mon Aug 10, 2009 6:48 am    Post subject: Reply with quote
kuuan wrote:
pentaxme wrote:

Hi, could you share how to de-yellow the lens under the sun? Thanks in advance. Smile


Hi Pentaxme, welcome to the forum!

how to de-yellow under the sun?
well, simply expose it to the strong equatorial sun of Singapore and watch that no tropical rain catches it Wink

I believe that really is all there is to it: expose it to sun with the caps off


Ugh, that could easily cause fire with concentrated sun rays focused to a single point. Usually, it is recommended to carefully wrap the lens into aluminum foil, leaving *only* the rear element exposed. Then put it under the sun, pointing the rear element to the sun (it's the rear one that yellows).

This way, you'll avoid excessive heating of the lens (you don't want that - or you can get all kinds of problems from stuck aperture blades to oil evaporating inside the lens and condensing onto the internal lens elements).

I did just that, and two weeks under the sun (about an hour a day) were enough to decrease the yellowing to a very faint level.


PostPosted: Mon Aug 10, 2009 7:20 am    Post subject: Reply with quote
Embarassed thank you for the correction aoleg!
( I have the impression that my Tak 50/1.4 de-yellowed quite a bit simply by shooting a lot with it! Very Happy )


PostPosted: Mon Aug 10, 2009 2:34 pm    Post subject: Reply with quote
Thank you very much Smile

Hope I won't get a chance to do this.

aoleg wrote:
kuuan wrote:
pentaxme wrote:

Hi, could you share how to de-yellow the lens under the sun? Thanks in advance. Smile


Hi Pentaxme, welcome to the forum!

how to de-yellow under the sun?
well, simply expose it to the strong equatorial sun of Singapore and watch that no tropical rain catches it Wink

I believe that really is all there is to it: expose it to sun with the caps off


Ugh, that could easily cause fire with concentrated sun rays focused to a single point. Usually, it is recommended to carefully wrap the lens into aluminum foil, leaving *only* the rear element exposed. Then put it under the sun, pointing the rear element to the sun (it's the rear one that yellows).

This way, you'll avoid excessive heating of the lens (you don't want that - or you can get all kinds of problems from stuck aperture blades to oil evaporating inside the lens and condensing onto the internal lens elements).

I did just that, and two weeks under the sun (about an hour a day) were enough to decrease the yellowing to a very faint level.
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