bluloo
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 p.1 #1 · Anyone else shooting a Samyang/Rokinon 135 have this issue? | |
So, I posted a previous thread in which I noted that my copy of the SY135 had a large, internal flare under certain lighting conditions, and was particularly noticeable when stopped down.
Being unable to resolve the issue (ruled out adapter reflection, light leaks etc), and that it appeared to be something internal to the lens, I returned it.
See pic 1, at bottom of post, for most egregious example of the flare on the first lens.
Given the otherwise excellent IQ and affordability of the lens, I decided to roll the dice and recently ordered the same lens from B&H (open box, as new), and set out to test it.
To my surprise, it has a similar, but much less noticeable flare under similar lighting conditions, when stopped down.
Examining the lens further, I noticed an internal haze or ring of some sort, and wondered if that might be reflecting/capturing light under certain conditions, when the lens was stopped down.
The blemish circled in blue, in the photos below.
It is visible with the naked eye, from multiple angles, and from the front and rear elements - though it seems to be more prominent, viewed from the rear.
I almost always shot the (first) lens wide open, where it's not noticeable, so it was likely present from the get go, but I never noticed. I also never checked for the same sort of internal blemish on the first copy.
My lens is Nikon mount, FWIW.
I wonder if others with the same lens (regardless of mount) might look to see if theirs has a similar blemish. I just find it odd that two different lenses would have a similar issue, and think it likely effects multiple lenses.
I've submitted an exchange request to B&H, and asked them to verify the replacement lens has no such blemish.
Comments, insights, and observations appreciated.
 Samyang 135 Internal Blemish by lareginl, on Flickr
 Samyang 135 Internal Blemish by lareginl, on Flickr
 Samyang 135 Internal Blemish by lareginl, on Flickr
 Samyang 135 Internal Blemish by lareginl, on Flickr
 Samyang 135 Internal Blemish by lareginl, on Flickr
Pic 1: Worst-case sample of internal flare, stopped down.
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That said, suppression of stray light is a weak spot in this otherwise awesome optic. Light within or outside the FX frame can easily generate excessive veiling glare, although I don't recall flaring or ghosts. In studio, I'm careful to flag the lights, and avoid white b/g if possible.
