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Some Hasselblad/Zeiss lenses in Jim Kasson's screening test

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Erik Kaffehr

Erik Kaffehr

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Hi,

Jim Kasson has developed a procedure for screening lenses described here:

Lens screening testing - the last word

Note: the best way to navigate this set of pages is to use the "Articles" section in the right-hand panel. It has links to all the pages and their titles. For the last few years, I have followed Internet discussions related to lens screening. By screening, I mean the process that a photographer...
blog.kasson.com blog.kasson.com

I have done that test on my P45+ with the Distagon 60/3.5CF:



Check full size image, below.
Check full size image, below.





Extreme corners and at 30 mm.
Extreme corners and at 30 mm.





Planar 100/3.5 CF



Check full size image, below.
Check full size image, below.



219509b0202242e395c5a822a070136d.jpg.png

I think both lenses seem to be quite OK. What is your take?

Best regards

Erik





--
Erik Kaffehr
Website: http://echophoto.dnsalias.net
Magic uses to disappear in controlled experiments…
Gallery: http://echophoto.smugmug.com
Articles: http://echophoto.dnsalias.net/ekr/index.php/photoarticles
 
Erik Kaffehr said:
Hi,

Jim Kasson has developed a procedure for screening lenses described here:

https://blog.kasson.com/lens-screening-testing/

I have done that test on my P45+ with the Distagon 60/3.5CF:

Check full size image, below.
Check full size image, below.

Extreme corners and at 30 mm.
Extreme corners and at 30 mm.

Planar 100/3.5 CF

Check full size image, below.
Check full size image, below.

219509b0202242e395c5a822a070136d.jpg.png

I think both lenses seem to be quite OK. What is your take?
Click to expand...
I think you have two well-assembled lenses. Are you OK with the corner astigmatism in the Planar? I would be. One axis falls off faster than the curves say it should, but it is radially symmetric. Both were wide open, I presume. Can I have the raws?

I din't provide distance curve for that size sensor. I'm assuming you used the 33x44mm curves and backed up a bit further?

Jim

--
http://blog.kasson.com
 
Last edited:
JimKasson said:
Erik Kaffehr said:
Hi,

Jim Kasson has developed a procedure for screening lenses described here:

https://blog.kasson.com/lens-screening-testing/

I have done that test on my P45+ with the Distagon 60/3.5CF:

Check full size image, below.
Check full size image, below.

Extreme corners and at 30 mm.
Extreme corners and at 30 mm.

Planar 100/3.5 CF

Check full size image, below.
Check full size image, below.

219509b0202242e395c5a822a070136d.jpg.png

I think both lenses seem to be quite OK. What is your take?
Click to expand...
I think you have two well-assembled lenses. Are you OK with the corner astigmatism in the Planar? I would be.

Jim

--
http://blog.kasson.com
Click to expand...
Hi Jim,

I am quite happy. I actually feel the Distagon performs a bit better than expected.

Just a small anecdote. Pierre, who happens to be my best friend worked at Hasselblad for a few years. So, he actually built his own camera.

Working at Hasselblad, he had access to all lenses. So before he left Hasselblad he went trough all his slides/negatives and found that the Distagon 60/3.5 and the 120/5,6 macro were the lenses that yielded most great images for him.

I look at the MTF data before buying and that may give a certain bias.

Best regards

Erik

--
Erik Kaffehr
Website: http://echophoto.dnsalias.net
Magic uses to disappear in controlled experiments…
Gallery: http://echophoto.smugmug.com
Articles: http://echophoto.dnsalias.net/ekr/index.php/photoarticles
 
Erik Kaffehr said:
Erik Kaffehr said:
J
Erik Kaffehr said:
Check full size image, below.
Check full size image, below.
Click to expand...
Click to expand...
Click to expand...
By the way, in my instructions, I'm pretty sure I suggest white balancing the center image, and applying that WB to all the others.

Checking... Yes, I do:

Loading…

blog.kasson.com

That will make it easier for you to compare lenses photographed in different circumstances, as long as those circumstances are consistent with the test instructions.

Jim

--
http://blog.kasson.com
 
Last edited:
JimKasson said:
Erik Kaffehr said:
JimKasson said:
J
JimKasson said:
Check full size image, below.
Check full size image, below.
Click to expand...
Click to expand...
Click to expand...
By the way, in my instructions, I'm pretty sure I suggest white balancing the center image, and applying that WB to all the others.

Checking... Yes, I do:

https://blog.kasson.com/lens-screening-testing/test-instructions-postproduction/

That will make it easier for you to compare lenses photographed in different circumstances, as long as those circumstances are consistent with the test instructions.

Jim

--
http://blog.kasson.com
Click to expand...
Much appreciated!

Erik

--
Erik Kaffehr
Website: http://echophoto.dnsalias.net
Magic uses to disappear in controlled experiments…
Gallery: http://echophoto.smugmug.com
Articles: http://echophoto.dnsalias.net/ekr/index.php/photoarticles
 
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