Author Topic: Sigma 105mm F2.8 EX DG Macro Flare Problem (Read 5397 times)

ruigsantos · « **on:** March 20, 2012, 07:11 »

Hi,

I have a Sigma 105mm F2.8 EX DG Macro (the old, non OS, version) and I noticed that sometimes I get a magenta halo on the centre of the image. It doesn’t happen when I use natural light. It usually happens when I’m doing macro photography, with a softbox at 45º from the subject, on a white background. Is this a common problem with this lens? Is it prone to backlight flaring or is it damaged?

I’m attaching 2 examples, straight from the camera. The magenta halo and lose of detail is noticeable on the centre of the image. f/11.

traveler1116 · « **Reply #1 on:** March 20, 2012, 08:56 »

Are you using the lens hood?

ruigsantos · « **Reply #2 on:** March 20, 2012, 09:10 »

Quote from: traveler1116 on March 20, 2012, 08:56

Are you using the lens hood?

I am. And on that lens, the front glass is very much inside the barrel so that can't be it.

luissantos84 · « **Reply #3 on:** March 20, 2012, 09:18 »

its light, too much light entering the lens/sensor, place the softboxes further away, I used to have this kind of issue, one time was really too much light other was the lens itself dirty like sweating (inside, not the front glass)

ruigsantos · « **Reply #4 on:** March 20, 2012, 09:28 »

Quote from: luissantos84 on March 20, 2012, 09:18

its light, too much light entering the lens/sensor

But how can that be? Both images even look a bit underexposed or is it just my eyes?

luissantos84 · « **Reply #5 on:** March 20, 2012, 10:03 »

Quote from: ruigsantos on March 20, 2012, 09:28

Quote from: luissantos84 on March 20, 2012, 09:18
its light, too much light entering the lens/sensor

But how can that be? Both images even look a bit underexposed or is it just my eyes?

no you are right.. they are under.. I never used the sigma 105mm but I had the same issue and it was the lens inside "sweating".. the weird fact here is that it works well with natural lighting.. so gotta be the strobes, the light from them..

ruigsantos · « **Reply #6 on:** March 20, 2012, 10:09 »

Quote from: luissantos84 on March 20, 2012, 10:03

I had the same issue and it was the lens inside "sweating".. the weird fact here is that it works well with natural lighting.. so gotta be the strobes, the light from them..

I will examine the inside of the lens closely to see if I can find anything strange...