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Leaf Credo 40 vs. 60 with symmetrical wide angles

gebseng

Member
Hey everyone,

For the last 7 years, I've been using the Leaf Credo (33x44mm CCD) with the Schneider Kreuznach Apo-Digitar 5.6/28mm XL. An almost perfect lens, but (due to its symmetrical design) with lots of hard-to correct (via LLC) magenta cast when shifted more than 10mm.

Since I wont't be able to afford the wide angle friendly IQ4 150 back for the foreseeable future (but hey, they started with € 35.000, and I'm seeing offers for 20.000 with buyback of my Credo 40 now), I'm thinking of getting a used Leaf Credo 60 or Phase One IQ 160 or 260 (with the 40x54 sensor) and using the SK Apo-digitar 5.6/35mm XL instead, which I already own.

Do you think that would improve the magenta cast situation, or would it mostly stay the same?

Thanks, geb
 

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Alkibiades

Active member
yes, all Dalsa 60 MP backs works perfect with the schneider 28 xl. But dont use 80 MP or 100 MP backs, to color cast will be too strong.
 

kinglang

Member
No,I can tell you with certainty that on the back of a 60 million CCD such as IQ160, if it moves more than 10mm, even if the magenta color cast has been done by LCC, the loss of the blue color channel cannot be corrected.
 

Alkibiades

Active member
wrong, the 60 MP Dalsa has the same pixeldestiny as the P45 but is bigger. both backs has no problems with 28xl becouse of their design.
the color cast can be remove fully. this was written by some guys years ago, with examples. this is not my opinon these are facts.
 

gebseng

Member
Thanks Kinglan, this is really helpful!

Since the LLC shows hard vignetting at the upper corners, I estimate this to be a 18mm or 19mm shift. (90mm image circle, 40x54mm sensor). Actually, the amount of magenta shift does not frighten me too much, compared to what I'm used to from the SK 28mm and the Credo 40 44x33mm sensor. So I guess these sensors must be different after all? Taking into consideration that, with the bigger sensor, I would mostly be using the SK 35mm instead of the 28mm as my "standard" lens for architecture, it would probably be even less severe.

thanks again,

Gebhard
Screenshot 2021-02-21 at 10.46.35.png
 
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Alkibiades

Active member
Thanks Kinglan, this is really helpful!

Since the LLC shows hard vignetting at the upper corners, I estimate this to be a 18mm or 19mm shift. (90mm image circle, 40x54mm sensor). Actually, the amount of magenta shift does not frighten me too much, compared to what I'm used to from the SK 28mm and the Credo 40 44x33mm sensor. So I guess these sensors must be different after all? Taking into consideration that, with the bigger sensor, I would mostly be using the SK 35mm instead of the 28mm as my "standard" lens for architecture, it would probably be even less severe.

thanks again,

Gebhard
View attachment 182198
indeed this shot is fully confusing, it is clearry out of the image circle of that lens- the vigniting is clear to see. You cant use a less out of their possibilities and say this dont work!
28 xl as the 35 xl has 90 mm imege circle.
on my 35xl 17 mm movements are possible on the big sensor . similar should be possible with all lenses with 90 mm image circle, more or little less.
but the corner sharpness decrease afcource, so if you get 12 mm movements with sharp corners you should be very happy- more is simply not possible with very wide lenses.
anyway the combination 28xl and 60 MP backs is well known and used so we dont need new alternative truth.
 
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