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06-01-2009, 02:37 PM   #1
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M 50mm f/1.7 issue

Hello all,

So I noticed this the other day when I was snapping with the M50 f/1.7 on. I assume this has to do with reflections in the lens , but perhaps not. Has anyone seen this reverse, inverted image before?

please tell me I can fix it with a hood or something

Thanks for all replys

~T





06-01-2009, 09:26 PM   #2
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Some of my first shots with the camera and kit lens were at night, and I had some streetlight reflections like that. The Zenitar FE would sometimes have a flare spot, but I haven't had anything that looks that bad since my first shots.

A hood won't help because the light source is in the frame. Obviously the lighting conditions are challenging. I'm not sure whether the lens should have been able to do better or not.
06-02-2009, 08:43 AM   #3
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Do you use UV filter? They often produce effect exactly like that.
M 50/1.7 is quite a good lens and has SMC coating.
06-03-2009, 12:30 PM   #4
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Original Poster
Yeah I figured a hood wood do squat because the lamp was in the frame. I did have a UV filter on though so I'll do some tests later when I get home from work.

Thanks for the replies
~T

06-03-2009, 01:25 PM   #5
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ytterbium is on the right track. It's probably the filter. The clue is that the flare is actually that lamp upside down. That's not to say that you can't get internal lens flare when a light source is included in the frame, but normally that'll show up in the shape of the aperture and will be repeated several times, based on how many elements your lens is made from.
06-03-2009, 02:02 PM   #6
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This is the reason I don't use UV filters most of the time. I've seen them cause single mirror image ghosts before like this. Luminous Landscape has a nice article about it (I'm at work or I'd take the time to find it, you can use google though).
06-04-2009, 11:56 AM   #7
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Yeah just did a quick and dirty test with the 50mm. First is with DIA UV filter, and second without. I have only more faith in the SMC coating now.

Still worry when i don't have that filter on though...



06-05-2009, 05:34 PM   #8
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I had to take the UV filter off my M50 for night pics...

I fould it created wicked ghosting reflections...



That problem disappeared when I removed the UV filter.

Pat

06-05-2009, 06:19 PM   #9
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What are the blue lights above the tower ladder, towards the trees? Kind of looks like the reflection of the reflexite trim off the firefighters gear that is climbing the ladder. Is that what you were referring to about the reflections?
06-05-2009, 06:59 PM   #10
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Capt ... Yup, they are the reflections of my flash off the helmet and bunkers reflexite strips. Once I took the UV filter off I never had that reflection problem again.

I knew his problem was the UV filter right away when I saw the blue reflection of the light on his dog.

Shiestmiester ... If you worry about the lens surface, get a hood on it to protect the glass.

Pat
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