jano
Evil Bokeh
When delving into digital photography a couple years ago, one of the first items brought to my attention was "Chromatic Abberation" or CA or purple fringing. A problem that plagues the poor lenses and sensors of digital P&S camera.
I understand in extreme circumstances, this issue can appear on any and all lenses.
However.. I've noticed quite a bit of CA with my G 45, even in circumstances where you wouldn't expect to see it. I've attached an example (please ignore the $, I'm testing vuescan).. and I'm confused as to why.. in fact, I'm even more confused about the coloring in the sky (white towards the horizon). The was was behind me at an angle (it was about 2pm, november, so the sun wasn't very high). I've actually got two 45's (one is my dad's), and both exhibit this behavior.
I don't typically pixel peep, but I've been scanning a couple rolls from a while back and noticed this trait.
Does film choice have anything to do with this, too? This was shot on kodak's E100VS. Or maybe it's the digital conversion that causes this? I want to check the slide out on a light table + loupe, but I don't have a loupe yet.
Thanks for your time
Jano
edit: whoops, the attachment
I understand in extreme circumstances, this issue can appear on any and all lenses.
However.. I've noticed quite a bit of CA with my G 45, even in circumstances where you wouldn't expect to see it. I've attached an example (please ignore the $, I'm testing vuescan).. and I'm confused as to why.. in fact, I'm even more confused about the coloring in the sky (white towards the horizon). The was was behind me at an angle (it was about 2pm, november, so the sun wasn't very high). I've actually got two 45's (one is my dad's), and both exhibit this behavior.
I don't typically pixel peep, but I've been scanning a couple rolls from a while back and noticed this trait.
Does film choice have anything to do with this, too? This was shot on kodak's E100VS. Or maybe it's the digital conversion that causes this? I want to check the slide out on a light table + loupe, but I don't have a loupe yet.
Thanks for your time
Jano
edit: whoops, the attachment
Last edited:
yossarian
Well-known
Jano, the sky looks as I would expect--near the horizon you're cutting through a much more dense layer of air, so this is more a factor of atmospheric haze.
As for the 45, I would NEVER trust a digital interpretation of a shot to gauge lens
quality. You could be seeing artifacts or it could be your screen producing the apparent coloration. For a loupe, begin with using the lens itself on the slides.
A 45 will give you about 6 to 6.5x magnification, which is not enough for critical
examination. I have a Peak 22x which has served me well, and they can be had
for about $45 or so.
Based upon everthing I've read (I don't own this lens), the 45 should have among the lowest levels of both forms of chromatic aberration.
Fred
As for the 45, I would NEVER trust a digital interpretation of a shot to gauge lens
quality. You could be seeing artifacts or it could be your screen producing the apparent coloration. For a loupe, begin with using the lens itself on the slides.
A 45 will give you about 6 to 6.5x magnification, which is not enough for critical
examination. I have a Peak 22x which has served me well, and they can be had
for about $45 or so.
Based upon everthing I've read (I don't own this lens), the 45 should have among the lowest levels of both forms of chromatic aberration.
Fred