Distortion on VC 35mm 2.5 11 lens

Sirius Glass

Subscriber
Joined
Jan 18, 2007
Messages
50,500
Location
Southern California
Format
Multi Format
The 38mm Zeiss Biogon [Hasselblad] and the 35mm f/2 Biogon ZM are the same design. Both are rectilinearly correct.
 
OP
OP

peter16

Member
Joined
Jun 24, 2011
Messages
106
Format
4x5 Format
in case it's useful to someone someday here's a comparison of the 35 skopar 2.5 and a summicron 35mm v4. Both at F 4, from an 8000 dpi drum scan.
I was mainly testing for resolution here, not distortion but if you look closely you can see the summicron has less barrel distortion.

Interestingly, when really pixel peeping on my resolution targets, the skopar out resolved the summicron at all apertures in the middle of the frame. Not by much but it won every time in a side by comparison. BUT as expected the summicron blows the doors off the skopar in the corners through F8, not even close...the second screenshot is from the upper right corner of the frame at 100%
 
Last edited:
OP
OP

peter16

Member
Joined
Jun 24, 2011
Messages
106
Format
4x5 Format
full image, and center crop showing middle left target
 
OP
OP

peter16

Member
Joined
Jun 24, 2011
Messages
106
Format
4x5 Format
a less scientific test using the same VC lens and a friends borrowed 35mm summicron Asph F2. curious if mods will take this down. some small rocks seem to evaporate on film version. However real test would be to make side by side full sized prints.
 

MattKing

Moderator
Moderator
Joined
Apr 24, 2005
Messages
53,726
Location
Delta, BC Canada
Format
Medium Format

darinwc

Subscriber
Joined
Dec 14, 2003
Messages
3,160
Location
Sacramento,
Format
Multi Format
You may also consider a summaron.
Here is a review:
https://kenrockwell.com/leica/35mm-f28.htm

I have no experience with that lens or the summicron. But experience does tell me that wide angle lenses are not their best wide open. So if using them stopped down to f4 for 5.6, why spent the extras money?
(I usually shoot at f16)
 
OP
OP

peter16

Member
Joined
Jun 24, 2011
Messages
106
Format
4x5 Format
MattKing said:
Why in the world would the Photrio mods take this down?
Click to expand...
my last post is comparing a drum scan of film with a 24mp digital file from the Leica M240 – thought this was maybe supposed to be all analog shop talk
 

MattKing

Moderator
Moderator
Joined
Apr 24, 2005
Messages
53,726
Location
Delta, BC Canada
Format
Medium Format
peter16 said:
my last post is comparing a drum scan of film with a 24mp digital file from the Leica M240 – thought this was maybe supposed to be all analog shop talk
Click to expand...
Just two ways of evaluating lens performance. Nothing particularly non-"APUG" about that.
Now if you were to stray into the digital image "capture" processes themselves - either scan or built into a camera - than you would have to pick the right areas of Photrio.
 
You must log in or register to reply here.
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…