weird reflections

[creb]

Advertisement (gone after registration)

recently I had the chance to try a ZEISS BIOGON 2.8/21 and a DISTAGON 4/18.

 

can anybode explain the the strange reflections/colors, e.g, above the number plate? it's not restricted to a particular surface, as shown by the fence behind the car.

 

 

christoph

[Advertisement]

The Leica Q3 is available for pre-order at B&H Photo Video and Adorama

[luigi bertolotti]

I saw similar effects in some focusing test shot... colored fringes in thin contrasted strips... but only with exaggerate "enlarging" : I don't think is related to a specific lens, but to DNG file processing (I saw differences in the phenomenon using C1, LR 1.1, LR 1.4); how did you obtain the above pics ? DNG ? JPG ?

This is an example... supercrop (400%) of a focus test chart, 320 ISO, DNG LR.

[ATTACH]88895[/ATTACH]

[creb]

I saw similar effects in some focusing test shot... colored fringes in thin contrasted strips... but only with exaggerate "enlarging" : I don't think is related to a specific lens, but to DNG file processing (I saw differences in the phenomenon using C1, LR 1.1, LR 1.4); how did you obtain the above pics ? DNG ? JPG ?

 

thank you, luigi - you are right, it's the raw processing. i used aperture - and i get the same weird result using C1. i don't get it if i use ACR or Raw Developer 1.7.

 

best,

christoph

[35mmSummicron]

What you are seeing is Colour Moire.

 

C1 does a really good job at controlling moire and colour noise in general compared to other raw processors, however sometimes you will still end up with it in your images.

 

There are some photoshop techniques to reduce/remove this depending on how much time you wish to spend on post-processing.

 

 

/a

[creb]

What you are seeing is Colour Moire./a

 

i know what causes moire when i try tro produce images of certain textures/fabrics but what's the cause of this kind of effect? and is there an explanation why it's that pronounced in the few images i have taken with this particular lens on the m8?

 

christoph

[jaapv]

Luigi's shot is different, that looks more like Chromatic Aberration. What you see on yours, is that the effect is in very-high contrast areas like chrome edges. That indicates sensor blooming. The multicoloured effect is probably a chromatic error of the lens.

All sensors exhibit sensor blooming at specific high contrasts and typically on chrome. The high frequency response (aka microcontrast) of a specific lens can worsen or lessen the effect. Some raw developers compensate better than others. You might try C4. Or try the fringe removal sliders in ACR (although those are rather lame).