Nex-7: Never noticed this before

Started May 11, 2012 | Discussions
eths
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Nex-7: Never noticed this before
May 11, 2012

While going through some pictures from my last vacation and fooling around with the 4.1 RC2 (Mac) version of LightRoom, I noticed vertical stripes in the sky above a cross in the B/W version of a picture. In the (almost totally) unprocessed original the stripes are not immediately visible.

Here two 1:1 crops illustrating the effect:

It looks like the Nex-7 sensor has some minor weaknesses after all.

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headofdestiny
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Re: Nex-7: Never noticed this before
In reply to eths, May 11, 2012

I don't believe that this is a sensor issue, but, rather, because you are using the first curtain electronic shutter at 1/4000. That's usually the cause of this phenomena. The manual mentions that issues can come up when using high shutter speeds and the electronic shutter. You should be fine if you set "FRONT CURTAIN SHUTTER" to OFF.

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eths
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Re: Nex-7: Never noticed this before
In reply to headofdestiny, May 11, 2012

Good point - This could easily be the explanation.

Sometimes I have it on and sometimes I don't. I have no idea if it was on or off at the time.

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ulfie
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Re: Nex-7: Never noticed this before
In reply to eths, May 11, 2012

Looks like subtle images of the Rapture above the crucifix.

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V1V1D
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Re: Nex-7: Never noticed this before
In reply to headofdestiny, May 12, 2012

headofdestiny wrote:

I don't believe that this is a sensor issue, but, rather, because you are using the first curtain electronic shutter at 1/4000. That's usually the cause of this phenomena. The manual mentions that issues can come up when using high shutter speeds and the electronic shutter. You should be fine if you set "FRONT CURTAIN SHUTTER" to OFF.

Would this apply to fast shutter speeds only? I never really fully understood the front curtain setting. Is it best to toggle at different speeds or is on or off the best all around setting?

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headofdestiny
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Re: Nex-7: Never noticed this before
In reply to V1V1D, May 12, 2012

V1V1D wrote:

headofdestiny wrote:

I don't believe that this is a sensor issue, but, rather, because you are using the first curtain electronic shutter at 1/4000. That's usually the cause of this phenomena. The manual mentions that issues can come up when using high shutter speeds and the electronic shutter. You should be fine if you set "FRONT CURTAIN SHUTTER" to OFF.

Would this apply to fast shutter speeds only? I never really fully understood the front curtain setting. Is it best to toggle at different speeds or is on or off the best all around setting?

This happens only at higher shutter speeds, but I don't know where the cutoff is, and the conditions vary. I never turn of my front curtain shutter, and I've never had this problem, myself.

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DezM
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Re: Nex-7: Never noticed this before
In reply to headofdestiny, May 12, 2012

headofdestiny wrote:

This happens only at higher shutter speeds, but I don't know where the cutoff is, and the conditions vary. I never turn of my front curtain shutter, and I've never had this problem, myself.

Same here
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El Matadurr
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Re: Nex-7: Never noticed this before
In reply to DezM, May 12, 2012

Ditto to that, since it is only visible in certain situations (sky on a bright day usually), I just always leave it on and don't worry about it. If I have some critical shot that I need to save, the blur brush in LR can get rid of the line. Though I have never had it show up, yet.

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DezM wrote:

headofdestiny wrote:

This happens only at higher shutter speeds, but I don't know where the cutoff is, and the conditions vary. I never turn of my front curtain shutter, and I've never had this problem, myself.

Same here
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flint-hill
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Do you recall the lens and approximate aperture?
In reply to eths, May 12, 2012

This is an interesting observation. And the effect has a familiar look to me though I can't recall the context in which I've seen it. It will come to me, probably.

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eths
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Re: Do you recall the lens and approximate aperture?
In reply to flint-hill, May 12, 2012

Sorry, I don't.

But I'll risk a wild guess based on the RAW file: Nikon Nikkor 28mm/f2.8 AIS at f4.

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eths
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Re: Nex-7: Never noticed this before
In reply to V1V1D, May 12, 2012

The only time I've seen problems in the past was with the Novoflex 600mm/f8.

One side of the picture is (sometimes) darker than the other if using the electronic first shutter with this long lens.

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nzmacro
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Re: Nex-7: Never noticed this before
In reply to eths, May 12, 2012

eths wrote:

While going through some pictures from my last vacation and fooling around with the 4.1 RC2 (Mac) version of LightRoom, I noticed vertical stripes in the sky above a cross in the B/W version of a picture. In the (almost totally) unprocessed original the stripes are not immediately visible.

Here two 1:1 crops illustrating the effect:

It looks like the Nex-7 sensor has some minor weaknesses after all.

Very interesting.

I have a few shots of exactly that blue with birds shots and about the same ratio. I'll convert a few and let you know.

All the best, very interesting.

Danny.
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nzmacro
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Different results
In reply to eths, May 12, 2012

I have first curtain set and lens at F/4.5. MF lens though, so might not be comparable.

From RAW. In LR4 and darkened the blue slightly, cropped around 100%, then converted in LR4 to B/W with the high contrast pre-set.

With those setting I didn't get any bands. I wonder if its the conversion or other settings. Interesting for sure. Would love to know what causes that.

All the best.

Danny.
...........................
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http://www.macrophotos.com/g2macro

Worry about the image that comes out of the box, rather than the box itself.

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headofdestiny
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Re: Different results
In reply to nzmacro, May 12, 2012

nzmacro wrote:

I have first curtain set and lens at F/4.5. MF lens though, so might not be comparable.

From RAW. In LR4 and darkened the blue slightly, cropped around 100%, then converted in LR4 to B/W with the high contrast pre-set.

With those setting I didn't get any bands. I wonder if its the conversion or other settings. Interesting for sure. Would love to know what causes that.

All the best.

Danny.
...........................
http://www.birdsinaction.com

http://www.macrophotos.com/g2macro

Worry about the image that comes out of the box, rather than the box itself.

I believe it is the 1/4000 shutter speed that is the cause with the OP's pic.

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nzmacro
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Ahh of course. Samples at 1/4000th
In reply to headofdestiny, May 13, 2012

headofdestiny wrote:

I believe it is the 1/4000 shutter speed that is the cause with the OP's pic.

Yes of course, sorry about that. took another look and ......

So same LR4 settings and these are higher shutter speeds. 1/3200th and 1/4000th. Fairly heavy crops.

All the best.

Danny.

...........................
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http://www.macrophotos.com/g2macro

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eths
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Re: Ahh of course. Samples at 1/4000th
In reply to nzmacro, May 13, 2012

Nice pics!

Interesting, that you don't have any vertical "bleeding". I've been looking through my library, and haven't found any further examples either, yet. It appears that this weakness needs exactly the right combination of factors to become recognizable.

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