What causes this ?

[srtiwari]

Just getting into testing film/developer combos. On a few, using 120, I get a narrow band of different density, on one or both sides, as you see in this crop (both edges showing). It doesn't always happen either, and never on 35mm.
I thought incomplete filling of the developing tank would be obvious, but on both edges ? Or is it the agitation etc. ?
I am hoping someone else knows what this is...
Subhash

 

[payasam]

Fresh developer?

 

[srtiwari]

Mukul,
I usually mix just before developing. But I am curious- why just on the edges, while the (liquid) developer sloshes about everywhere in the tank. Either the top, or the bottom, of the tank (but not both) would have been easier to understand...
Subhash

 

[HuubL]

What camera did you use? Shutter curtains or central shutter? If it's curtains than perhaps uneven running? OTOH, when I open the photo at higher magnification, the effect seems gone. Are you sure it hasn't something to do with the lightfall on the water?

 

[titrisol]

120? depending on the brand and the way you load/unload some light may have leaked thorugh the edges, thus making those marks

 

[srtiwari]

Rolleiflex 3.5F (Recently CLA'd)
Efke R100 (in Rodinal 1:50, I think)

I do try to maintain the correct, and consistent temperatures.

Here is another unevenly developed frame- note the darker looking zone in the sky.
Subhash

 

[HuubL]

The last one is different. That's the opposite effect with a darker band. The first one had lighter areas. It may have something to do with development. Too frequent inversion? Too dilute developer/fixer?

 

[srtiwari]

The last one is different. That's the opposite effect with a darker band. The first one had lighter areas. It may have something to do with development. Too frequent inversion? Too dilute developer/fixer?

It seems the same to me, in the sense that the edges (varying width ?) are lighter than the middle.

 

[f/stopblues]

Is it visible on the negative? I get very similar results when I scan my 120 frames on a flatbed scanner. It comes from the negative not lying flat. Just a thought!

Of course, if it is visible on the neg then ignore this post

 

[nikon_sam]

120? depending on the brand and the way you load/unload some light may have leaked thorugh the edges, thus making those marks

I can agree with this on the first shot...you need to keep the film/paper tight on the reel while changing rolls to prevent light leaks...even the slightest amount of slack could allow light to get to the film...

 

[nikon_sam]

The last one is different. That's the opposite effect with a darker band. The first one had lighter areas. It may have something to do with development. Too frequent inversion? Too dilute developer/fixer?

And I can agree with this on the second shot...I see this at times on some shots I've taken...this happens more so with bright skies...I read that I may need to agitate a bit more to prevent the developer from exhausting (in large bright areas) while developing...my two cents...

 

[kaiyen]

if you're getting bands of differing development on the edges, it's almost always due to insufficient breakup of flow during agitation, I've found. Not an issue of not enough agitation, but the type of agitation. You can spin the tank, for instance, and get all kinds of development movement, but it's just spinning horizontally and you might not get even disruption of flow. You could just invert, and that usually works, but sometimes you don't quite get enough movement, either.

I rotate as I invert. If you're using a steel tank, make sure that you have enough space so that the developer has room to actually move around in the tank. If it's too full then it's not going to get much break-up in the flow.

 

[drewbarb]

I'd like to see the negatives before I try to diagnose this. I suspect you are getting light leaks from the paper not being tight enough, but it's a tough to call to make effectively just seeing a sample scan. It could be processing marks, but again, without seeing your methods, it's tough to call. Any experienced photographer could watch your process, look at your results, and tell you what the cause is, but it's tough to get the right answer online. From my experience with reading these threads, you are likely to get a whole range of ideas, from the likely to the hair-brained. Can you show a scan of your whole piece of film, shown as a negative and with the edges, so we can see how it all looks?

 

[srtiwari]

I'd like to see the negatives before I try to diagnose this.

Here it is. Ignore the Right/Left orientation issue (My Bad), but ALL the frames are from the same roll. In the second picture, No bands are seen, and in the multiple pelican frame, there are little "rivulets" running down mid-frame- I do NOT believe these are reflections of the mangroves.
Does this help ?
BTW, thanks for all your efforts.:bang:

 

[Chriscrawfordphoto]

if you're getting bands of differing development on the edges, it's almost always due to insufficient breakup of flow during agitation, I've found. Not an issue of not enough agitation, but the type of agitation. You can spin the tank, for instance, and get all kinds of development movement, but it's just spinning horizontally and you might not get even disruption of flow. You could just invert, and that usually works, but sometimes you don't quite get enough movement, either.

I rotate as I invert. If you're using a steel tank, make sure that you have enough space so that the developer has room to actually move around in the tank. If it's too full then it's not going to get much break-up in the flow.

You were the only one to diagnose it right. I have had the same problem, and using more vigorous movements during agitation fixed it. It is not light leaks or bad shutter.

 

[CuS]

Its thh film

Its thh film

Efke roll film (I have used 127) will edge fog really easily of you don't handle the rolls in very subdued light. Just be careful.

Rolleiflex 3.5F (Recently CLA'd)
Efke R100 (in Rodinal 1:50, I think)

I do try to maintain the correct, and consistent temperatures.

Here is another unevenly developed frame- note the darker looking zone in the sky.
Subhash