Elmarit 2.8/28, streaks in film

[m.c.fitz]

<p>I have an Elmarit 2.8/28 lens, which on a couple of recent rolls of film has shown some strange streaks. It isn't the camera, an M6, because my other lenses don't have this problem, and the 28 was used on a second M6 and the same problem occurred.<br>

It doesn't happen consistently, however, on all frames of the film, but mainly when outside under very bright, strong light.<br>

Here are some examples of what is happening:<br>

<img src="/photo/17746059" alt="" /></p>

<p><img src="/photo/17746060" alt="" /><br>

<br />This hasn't occurred on all 36 exposures, nor has it happened on all shots taken under bright sunlight. It is always on the same side, which corresponds to the place where there is a bit cut out of the sun shade on the 28. This makes me wonder if it is some sort of strange flare. <br>

Film used is Ilford Delta 100, developed in Xtol, 1+1 dilution. And is isn't surge marks from the developping, either, that I know.<br>

Any ideas as to what this might be due to? I searched the data base here to try and discover if this problem has been discussed, but it doesn't seem to have been. In fact, I came across several threads where people said the Elmarit 28mm is not prone to flare.<br>

Thanks.</p>

<div></div>

[Robin Smith]

<p>Doesn't look like the lens to me. Looks like uneven development or drying marks or some such.</p>

[Gus Lazzari]

<p>Lenses don't cause streaks, <strong>especially high quality</strong> ones.</p>

<p>Even without seeing other sample images/negs, I'd still point to <strong>scanning</strong> or the developing process.<br /> I'll add that if one does have the strip of negatives/proof sheet, a closer inspection will probably show the "strange streaks" across the frame etc..<br /> (The sky is usually more uniform then the rest of the image area, which better reveals subtle issues)</p>

[JDMvW]

<p>Maybe insufficient agitation in the developing, but whatever, I'm pretty sure it's not the lens.<br>

Maybe just shows up more on the more inclusive wide-angle shots with more sky.</p>

[john_shriver]

<p>Was the shutter speed possibly 1/1000? It looks like the shutter is capping, with the slot getting so narrow at one end of the frame that the roughness of the shutter curtains makes a significant fraction of the slit width.</p>

[mukul_dube]

<p>Not likely to be "some sort of strange flare" -- dark rather than light.</p>

[baisao]

<p>I've seen marks like this with exhausted fixer, not enough fixing, or with not enough rinsing. I could never prove it but I think that too much final rinse solution could cause some streaking. <br>

If your fresh fixer claims to work at a specific time on a traditional B&W film you will have to increase that time by a third for T-grain, Sigma-grain, Delta-grain films. So if your fresh fixer says 4 minutes of fixing, you will need to increase that to 6 minutes of fixing for those modern emulsions.</p>

<p>HTH</p>

 

[m.c.fitz]

<p>Many thanks for all the replies.</p>

<p>Just to address a few suggestions that were made: the streaks are only on some of the negatives, not all of them.</p>

<p>They are definitely on the negs, and were not caused by the scanner. They show up on the contact sheet printed in the darkroom, and on the work prints also made there.</p>

<p>Using a loupe and a light box, I've inspected the negatives and the streaks do not extend all the way across the frame.</p>

<p>I do not believe the chemistry or development and agitation are the cause. As I mentioned, only some of the negatives on the roll show this problem, not all of them. And the other film that was in the tank when this was developed is fine. The fix was fresh, and I adapt the time as required for the film type.</p>

<p>And a friend to whom I loaned the 28 experienced the same problem with his M6. Different camera, different photographer, same problem, and again, only on some of his negatives.</p>

<p><strong>John Shriver</strong>, thank you for your suggestion, which I more or less grasp. Could you explain a bit more what would be involved in such a thing as you described? The shutter speed could indeed have been 1/1000s, I don't recall.</p>

<p>At any rate I'll be pleased to rule out a problem with the lens.</p>

<p>Thank you again, gentlemen, for taking the time to consider the problem and reply.</p>

[Gus Lazzari]

<blockquote>

<p>"same problem with his M6. Different camera, different photographer, same problem," <em><strong>m.c. f.</strong></em></p>

</blockquote>

<p>This isn't logical. (One must revisit <strong>the facts</strong>)<br /> Lenses are round, so it can't (especially quality ones) make <strong>straight line</strong> exposure variations.<br /> <br /> I do acknowledge that two separate M6 cameras can have the <strong>very common</strong> <em>curtain-travel-times</em> balance issue. (Needs to be checked by a <strong>3 sensor</strong> shutter speed tester)<br /> <br /> That said, I too considered this possible high speed shutter issue, but absent the <strong>massive</strong> exposure falloff present in that symptom, I ruled it out. <br /> Now, the upper right corner does have a dark area, but this exhibits classic wide-angle <strong>optical</strong> lens vignetting, so this fact contributed in ruling out a gradient shutter issue...</p>