Sony a7 very strange issue...

Started Apr 17, 2014 | Discussions
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j0sh
j0sh Regular Member • Posts: 357
Sony a7 very strange issue...

Hi guys
I'm having a very strange problem with my sony a7.
Shooting with canon fd 24mm and nd filter in landscape mode I get a strange dark bar on the left of the picture. If I shoot in portrait mode everything is fine...
Without nd filter is all good...
I changed lens from 24mm to 35mm canon fd and have the same issue with the nd filter on...
If I rotate the filter the bar is always on the left... I can even see it in the preview.
Do you know what it could be?

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viking79
viking79 Forum Pro • Posts: 14,137
Re: Sony a7 very strange issue...

j0sh wrote:

Hi guys
I'm having a very strange problem with my sony a7.
Shooting with canon fd 24mm and nd filter in landscape mode I get a strange dark bar on the left of the picture. If I shoot in portrait mode everything is fine...
Without nd filter is all good...
I changed lens from 24mm to 35mm canon fd and have the same issue with the nd filter on...
If I rotate the filter the bar is always on the left... I can even see it in the preview.
Do you know what it could be?

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Sounds like something is obstructing the image.

The sensor is wider than it is tall (and the image is a circle) so if something blocks the left side in landscape, if you rotate it to the left in portrait it might no longer be blocking the image that hits the sensor.

Eric

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j0sh
j0sh OP Regular Member • Posts: 357
Re: Sony a7 very strange issue...

j0sh wrote:

Hi guys
I'm having a very strange problem with my sony a7.
Shooting with canon fd 24mm and nd filter in landscape mode I get a strange dark bar on the left of the picture. If I shoot in portrait mode everything is fine...
Without nd filter is all good...
I changed lens from 24mm to 35mm canon fd and have the same issue with the nd filter on...
If I rotate the filter the bar is always on the left... I can even see it in the preview.
Do you know what it could be?

-- hide signature --

Sounds like something is obstructing the image.

The sensor is wider than it is tall (and the image is a circle) so if something blocks the left side in landscape, if you rotate it to the left in portrait it might no longer be blocking the image that hits the sensor.

Eric

It's weird... I guess the issue is with the nd filter... Without it everything is fine...
--
Please check my pics on http://www.flickr.com/photos/giuseppemilo/

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j0sh
j0sh OP Regular Member • Posts: 357
Sample picture

Here is a sample

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D Cox Forum Pro • Posts: 14,099
Re: Sony a7 very strange issue...

I don't think it's a dark bar. I think it is some kind of flare that covers all of the image except the extreme left.

Does it vary according to what direction the camera is pointed ?

Look at the release catch on your lens adapter to see if light is leaking in there. If so, stick a bit of black paper on the inside of the adapter to block the leak.

demarren 123 Veteran Member • Posts: 3,616
Re: Sony a7 very strange issue...

j0sh wrote:

Hi guys
I'm having a very strange problem with my sony a7.
Shooting with canon fd 24mm and nd filter in landscape mode I get a strange dark bar on the left of the picture. If I shoot in portrait mode everything is fine...
Without nd filter is all good...
I changed lens from 24mm to 35mm canon fd and have the same issue with the nd filter on...
If I rotate the filter the bar is always on the left... I can even see it in the preview.
Do you know what it could be?

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I think you get the filter with the sky and the ground level.

to get better sky colour and better ground colour.

My Advice no filters.

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j0sh
j0sh OP Regular Member • Posts: 357
Re: Sony a7 very strange issue...

I don't think it's a dark bar. I think it is some kind of flare that covers all of the image except the extreme left.

Does it vary according to what direction the camera is pointed ?

Look at the release catch on your lens adapter to see if light is leaking in there. If so, stick a bit of black paper on the inside of the adapter to block the leak.

I tried that... With no luck. I posted a sample. The bar is always the same (form & size)
--
Please check my pics on http://www.flickr.com/photos/giuseppemilo/

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Nordstjernen
Nordstjernen Veteran Member • Posts: 6,876
Re: Sony a7 very strange issue...

j0sh wrote:

I changed lens from 24mm to 35mm canon fd and have the same issue with the nd filter on...
If I rotate the filter the bar is always on the left... I can even see it in the preview.
Do you know what it could be?

What kind of ND-filter, and how is it mounted on the lens? What about other tan Canon lenses and the actual adapter?

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j0sh
j0sh OP Regular Member • Posts: 357
Re: Sony a7 very strange issue...

j0sh wrote:

I changed lens from 24mm to 35mm canon fd and have the same issue with the nd filter on...
If I rotate the filter the bar is always on the left... I can even see it in the preview.
Do you know what it could be?

What kind of ND-filter, and how is it mounted on the lens? What about other tan Canon lenses and the actual adapter?

The filter is a 52mm Hoya 10 stops it is screwed on the lens
I need to try the 28-70 kit lens with nd filter but I'm away right now.

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ProfHankD
ProfHankD Veteran Member • Posts: 3,995
Faulty ND filter?

j0sh wrote:

Here is a sample

Yeah, that's strange alright.

My guess would be that the ND filter is some type of sandwich using gel filters and the gel has shifted slightly or been bleached over time and exposure to light. If so, this should be visible inspecting the ND filter directly. This almost looks like a badly-made homemade ND filter constructed using a piece of exposed film... not that I'd ever do that (again).  

The other possibility would be a loose mask in the light path (e.g., inside an adapter), but that seems less likely given that you say it only happens with the ND filter.

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j0sh
j0sh OP Regular Member • Posts: 357
Re: Faulty ND filter?

j0sh wrote:

Here is a sample

Yeah, that's strange alright.

My guess would be that the ND filter is some type of sandwich using gel filters and the gel has shifted slightly or been bleached over time and exposure to light. If so, this should be visible inspecting the ND filter directly. This almost looks like a badly-made homemade ND filter constructed using a piece of exposed film... not that I'd ever do that (again).  

The other possibility would be a loose mask in the light path (e.g., inside an adapter), but that seems less likely given that you say it only happens with the ND filter.

Yeah and just in landscape mode O_o
No issues in portrait mode...
--
Please check my pics on http://www.flickr.com/photos/giuseppemilo/

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martindesu
martindesu Senior Member • Posts: 1,245
Re: Faulty ND filter?

Photo of the setup?

Weird indeed!

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Nordstjernen
Nordstjernen Veteran Member • Posts: 6,876
Re: Sony a7 very strange issue...

j0sh wrote:

The filter is a 52mm Hoya 10 stops it is screwed on the lens
I need to try the 28-70 kit lens with nd filter but I'm away right now.

What surprises me is the sharp edge at the bottom, fading a bit towards the top of the frame. Seems like something is going on close to the sensor rather than in front of the lens.

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Zeisschen
Zeisschen Regular Member • Posts: 196
shutter?

Nordstjernen wrote:

j0sh wrote:

The filter is a 52mm Hoya 10 stops it is screwed on the lens
I need to try the 28-70 kit lens with nd filter but I'm away right now.

What surprises me is the sharp edge at the bottom, fading a bit towards the top of the frame. Seems like something is going on close to the sensor rather than in front of the lens.

I think the same. I mean if it happens in portrait but not landscape it has to be something mechanical. Maybe the shutter is still a bit there with the long eposure times? Maybe it's a mechanical shutter problem.

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D Cox Forum Pro • Posts: 14,099
Re: Sony a7 very strange issue...

j0sh wrote:

I don't think it's a dark bar. I think it is some kind of flare that covers all of the image except the extreme left.

Does it vary according to what direction the camera is pointed ?

Look at the release catch on your lens adapter to see if light is leaking in there. If so, stick a bit of black paper on the inside of the adapter to block the leak.

I tried that... With no luck. I posted a sample. The bar is always the same (form & size)

Well, just try wrapping a dark cloth around both the adapter and the lens mount of the camera. It could possibly be the famous light leak around the lens mount -- which again is said to be worst at the position of the release catch (the one on the camera).

The more I look at it the more it looks like a light leak.

Here is a light leak from an adapter. The subject is a very dark (badly underexposed) 35mm slide that I was digitising.

And here without the leak.

D Cox Forum Pro • Posts: 14,099
Re: shutter?

Zeisschen wrote:

Nordstjernen wrote:

j0sh wrote:

The filter is a 52mm Hoya 10 stops it is screwed on the lens
I need to try the 28-70 kit lens with nd filter but I'm away right now.

What surprises me is the sharp edge at the bottom, fading a bit towards the top of the frame. Seems like something is going on close to the sensor rather than in front of the lens.

I think the same. I mean if it happens in portrait but not landscape it has to be something mechanical. Maybe the shutter is still a bit there with the long eposure times? Maybe it's a mechanical shutter problem.

Assuming it is a light leak, then the point where the light is getting in may be in shadow in portrait mode.

ProfHankD
ProfHankD Veteran Member • Posts: 3,995
If it is a light leak...

j0sh wrote:

Yeah and just in landscape mode O_o
No issues in portrait mode...

I saw that you had said that; a bad gel filter is still a possibility by either shifting or getting internal reflections within the filter assembly.

I see folks suggesting a light leak, and that's possible too. If it's a light leak in your lens adapter, the reason it would be showing only with the ND filter is simply that without the ND filter, the leak isn't bright enough to show over the image -- but it would really always be there. Test for this by trying a shot with a lens cap on. If it's a light leak, you'll get an image of the leak by itself with an opaque lens cap on....

Of course, the reason you might not see a light leak with the camera rotated would be that the leak is blocked by you hand, a shift in the play in the adapter, etc.

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j0sh
j0sh OP Regular Member • Posts: 357
Re: If it is a light leak...

ProfHankD wrote:

j0sh wrote:

Yeah and just in landscape mode O_o
No issues in portrait mode...

I saw that you had said that; a bad gel filter is still a possibility by either shifting or getting internal reflections within the filter assembly.

I see folks suggesting a light leak, and that's possible too. If it's a light leak in your lens adapter, the reason it would be showing only with the ND filter is simply that without the ND filter, the leak isn't bright enough to show over the image -- but it would really always be there. Test for this by trying a shot with a lens cap on. If it's a light leak, you'll get an image of the leak by itself with an opaque lens cap on....

Of course, the reason you might not see a light leak with the camera rotated would be that the leak is blocked by you hand, a shift in the play in the adapter, etc.

I guess you're right. I tried to cover the lens with a scarf and the leak was gone... so it has to be the fotodiox adapter or the famous sony's leak issue

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j0sh
j0sh OP Regular Member • Posts: 357
Re: Sony a7 very strange issue...

D Cox wrote:

j0sh wrote:

I don't think it's a dark bar. I think it is some kind of flare that covers all of the image except the extreme left.

Does it vary according to what direction the camera is pointed ?

Look at the release catch on your lens adapter to see if light is leaking in there. If so, stick a bit of black paper on the inside of the adapter to block the leak.

I tried that... With no luck. I posted a sample. The bar is always the same (form & size)

Well, just try wrapping a dark cloth around both the adapter and the lens mount of the camera. It could possibly be the famous light leak around the lens mount -- which again is said to be worst at the position of the release catch (the one on the camera).

The more I look at it the more it looks like a light leak.

Here is a light leak from an adapter. The subject is a very dark (badly underexposed) 35mm slide that I was digitising.

And here without the leak.

You're right.. I tried with a scarf on the lens and the leak was gone... it has to be an issue with the adapter OR the camera... I'll try with the kit lens next week.

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j0sh
j0sh OP Regular Member • Posts: 357
Re: shutter?

D Cox wrote:

Zeisschen wrote:

Nordstjernen wrote:

j0sh wrote:

The filter is a 52mm Hoya 10 stops it is screwed on the lens
I need to try the 28-70 kit lens with nd filter but I'm away right now.

What surprises me is the sharp edge at the bottom, fading a bit towards the top of the frame. Seems like something is going on close to the sensor rather than in front of the lens.

I think the same. I mean if it happens in portrait but not landscape it has to be something mechanical. Maybe the shutter is still a bit there with the long eposure times? Maybe it's a mechanical shutter problem.

Assuming it is a light leak, then the point where the light is getting in may be in shadow in portrait mode.

I tried covering the lens with a scarf and the leak was gone...

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