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04-19-2011, 09:18 PM   #1
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is this haze?

i tried searching around for pictures of haze, but i was not successful in determining what this is.
i noticed my 50mm 1.4 was not as sharp as my 50mm 1.7 and happened to do the flashlight test. my 1.7 looked fantastic, but my 1.4 reflected a bit of what i think is probably a LOT of dust, but could be haze or maybe fugus?

i have a crop of the best shot i could get of it. then some with the light hitting it from different angles. looking at it head on, it looks pretty clear and i thought it was in perfect condition until i brought out an LED light...

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04-19-2011, 09:24 PM   #2
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whatever it is, it doesn't look like a good sign
04-19-2011, 09:50 PM   #3
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Separation.
04-19-2011, 10:41 PM   #4
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+1 separation

04-19-2011, 10:50 PM   #5
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+2 separation from the lens, as in you should part ways.
04-19-2011, 10:58 PM   #6
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It seems to be on the front element.
And the front element is not cemented (http://kmp.bdimitrov.de/lenses/primes/_optics/50f1.4-ii.jpg ) so it seems more like haze or fungus.

Anyway untill you find the answer you should not store it with your other lenses !
04-20-2011, 12:28 AM   #7
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i was looking at it from a few different angles and it definitely looks like its in there about 3 pieces of glass back. it seems to have a definite curvature to it and makes sense that it is separation

the diagram helps.

this lens has been in quarantine (about 20miles away on a shelf) since i discovered this as i didn't want to risk it. the rest of my lenses sit with silica gel. however, looking at pictures i've taken with it, even though it is slightly less sharp than my A 1.7, i do like the pictures it takes.
i guess i'll take a few more test shots and retire it unless it convinces me otherwise.

i've updated the serial database to reflect its condition.
thanks!
04-20-2011, 12:57 AM   #8
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Ok sorry for you

But if it's not affecting too much the quality of the pictures then you avoided the worst...

04-20-2011, 06:28 AM   #9
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separation, but it's surprising how bad a lens has to be before it becomes unusable. it may now be prone to more flare or softness but i bet it still takes good images in many cases. I have seen images shot with cracked front elements that looked good
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