Unexpected Summicron ASPH 35mm Vignetting at f/2.0 on Film

[wstotler]

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Hello!

 

I had some surprising and unexpected vignetting when I moved my 35mm Summicron ASPH from my M8 onto my M6TTL.

 

I was shooting at 1/60th of a second at f/2.0. Film speed was 200. (Incident light meter indicated this was an OK combo for this environment.) I removed the UV Cut filter prior to shooting.

 

Can someone comment if this is a normal amount of vignetting for the M6TTL, the Summicron ASPH at f/2.0, and film? (The "blown" highlights don't bother me much, BTW.)

 

I don't see this kind of vignetting with the M8, presumably because of the crop factor?

 

Thanks!

Will

 

P.S. I didn't see vignetting like this in my shots taken outdoors at f/5.6 with the Summicron/M6TTL combo.

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[nobbylon]

looks pretty much same as mine sometimes, I think it depends a bit on light source.

Mine doesn't vignet as much as my old ultron 35mm did though

[SoFi-Chaser]

I think, there are two reasons for this effect:

1st

You can't beat physics. at f/2 there still is some vignetting. but not as much as shown here. at f/5,6 you won't recognize it, only if you shoot against the blue sky or similar objects.

Did you shoot as well at f/5,6 in that room?

 

2nd

I see darker walls in the corner on the top. But in this room, there is no light there to be reflected to your lens. At the bottom of the images I can't see the vignetting as much as in the top. But if it was the lens, it should be there (or did you use flash?).

 

So I'm quite sure, your lens is still perfect an it's simply the light-cone of the lamps in the wall that causes this effect.

 

regards

 

Torsten

[wstotler]

Thanks for your response.

I think, there are two reasons for this effect:

1st <snip> Did you shoot as well at f/5,6 in that room?

 

No, I didn't. Not enough light. That would have been a good test.

 

 

But if it was the lens, it should be there (or did you use flash?)

 

No flash--just the light in the scene.

 

 

So I'm quite sure, your lens is still perfect an it's simply the light-cone of the lamps in the wall that causes this effect.

 

I figured the lens was OK but was surprised at the amount of vignetting--couldn't determine exactly *why* the conditions in this scene would provoke it so much. Thanks for your input.

 

Will

[wstotler]

looks pretty much same as mine sometimes, I think it depends a bit on light source.

Mine doesn't vignet as much as my old ultron 35mm did though

 

Thanks for the info.

Will

[christer]

why don't you shoot an evenly lit greyish surface? that will show you how much the lens vignets. the sample photos you show are not relevant as the picture area is not evenly lit.

[rob_x2004]

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It looks like dark corners and shadows and light fall off to me. The way you have the subjects arranged contributes.

 

I would have said there is probably some vignetting but them when I looked at the pattern of the second image you can see the dark increasing and decreasing entirely without consistency of vignetting. I wonder if there is any at all.

 

You have two point sources entirely within the frame and really I think the cron has handled these pretty well. I think also you have over exposed the frame by a long shot, and the film doesnt have the latitude to handle the exposure variation. Try one with wider range, even if it means going back to lower ISO. Theres no point burning faces out.

 

Back on topic, someone said shoot an even lit bit of card or a wall and stand teh curves on end in photoshop and you will see what the vignetting is. I am sure there is some. But I reckon it is hidden behind other stuff in this image.

[rob_x2004]

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[sbelyaev]

Mine does exactly the same..

[SoFi-Chaser]

[...]

I figured the lens was OK but was surprised at the amount of vignetting--couldn't determine exactly *why* the conditions in this scene would provoke it so much. Thanks for your input.

 

Will

Hi again,

 

this reminds me on some phenomena I've observed in several eclipses (german abreviation of solar eclipse is SoFi )

--> the human eye or better data-treatment behind (called brain) is faaaar better in handling contrasts and dynamic range than any film or actual sensor.

 

The wall looks OK, when you spot it in the viewfinder, but your film doesn't lie.

 

BTW: That's why you can never make a good image of the corona with one single shot (i.e. you need several and that costs time, you mostly haven't got - the moon doesn't wait but next year it's again over 6 minutes of totality:rolleyes:)

 

Hope that explains a little.

 

Best regards

 

Torsten

[tashley]

Hello!

 

I had some surprising and unexpected vignetting when I moved my 35mm Summicron ASPH from my M8 onto my M6TTL.

 

 

Hi Will,

 

Did you take off your IR filter? I have found that on some lenses, when I move from M8 to my MP I get a little vig from the filter.

 

Tim

[xjr]

Where is the vignetting except for uneven illumination and shadows ?

[rob_x2004]

There isnt any. Or it is buried beneath the shadows or the uneven light.

[aauckland]

I don't believe your lens is showing any noticable vignetting,

.....I simply see shadow area's created by the limited ceiling lighting.

 

Alan.