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Hello everybody,

I would like to know your opinion about the light "bubbles" you see in the picture below.

I took this shot a few months ago and developed it only recently. The film is Adotex CMS 20 II Pro. This is not the only picture of the roll showing "bubbles", which, however, in other shots appear with different sizes and in different positions. Given this and the fact that in all other rolls I've taken thereafter there is no trace of bubbles, I wonder whether they are not light leaks (likely due to pinholes in the curtains) but rather artefacts stemming from a wrong development. Or, in fact, are they tiny light leaks, which become only noticeable at long exposure times?

As you can see, the film is highly scratched too. It was my first experience with it, and I must admit I had some troubles when loading it into the reel. It kind of jammed. The are also "bands", which are likely due to an uneven development. Yet, I was careful during the first 30 sec. of agitation not to be too harsh, and so was I at each single inversion in the following minutes. Perhaps, the fact that the room temperature was of 26 Celsius degree didn't help (when developed in ADOTHECH IV at ISO 6, the solution must be at 20 degrees; I poured the developer in the tank at that temperature, but stop bath and more importantly the fixer were at room temperature). 

 

Is there anyone familiar with this film who can enlighten me a bit? Thanks a lot!

 

 

Best,

Nicola

 

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Edited by 4r36
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I've had the same spots on CMS20II using a Nikon so don't worry about your camera having pinholes.

I'm not at all sure what causes the bubbles, in my case they were all at the start of the film, and appeared on two films from the first batch of five I bought, and I've had two or three further batches and there hasn't been a problem. Nearly all my CMS20 films have been processed in Adotech IV and the technique follows the book, very gentle agitation, just a swish of the tank, perfect temperature, etc. so I'm putting it down to faulty film. So sorry I can't really help, only confirm that something strange is going on.

Edit - I started thinking about the scratch marks in your sky, so here is the third frame on my first roll of CMS20II

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and here is the next shot on the same roll

which shows none of the faults. After the first ten frames there are no problems on the roll at all.

Edited by 250swb
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  • 2 weeks later...
On 7/17/2022 at 4:41 PM, 250swb said:

 

I've had the same spots on CMS20II using a Nikon so don't worry about your camera having pinholes.

I'm not at all sure what causes the bubbles, in my case they were all at the start of the film, and appeared on two films from the first batch of five I bought, and I've had two or three further batches and there hasn't been a problem. Nearly all my CMS20 films have been processed in Adotech IV and the technique follows the book, very gentle agitation, just a swish of the tank, perfect temperature, etc. so I'm putting it down to faulty film. So sorry I can't really help, only confirm that something strange is going on.

Edit - I started thinking about the scratch marks in your sky, so here is the third frame on my first roll of CMS20II

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and here is the next shot on the same roll

which shows none of the faults. After the first ten frames there are no problems on the roll at all.

I see only now your reply, thanks a lot. I think you're right in saying that the problem lies in a faulty film. Mirko, the owner of Adotex, is active on Photrio, and, after basically excluding errors in the development process, he told me that they don't know what might have cause the bubbles. He also told me that the scratches are in fact dust particles, although he doesn't have an explanation of why they deposited just in the sky. Like in your case, I had clean shots, showing neither bubbles nor dust, on the same roll. For example the one below. 

I've shot another roll recently and I didn't have any problem except for a single frame, showing a little bubble. Hopefully, it was just an isolated fault! Thanks again ;)

 

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5 minutes ago, 4r36 said:

I see only now your reply, thanks a lot. I think you're right in saying that the problem lies in a faulty film. Mirko, the owner of Adotex, is active on Photrio, and, after basically excluding errors in the development process, he told me that they don't know what might have cause the bubbles. He also told me that the scratches are in fact dust particles, although he doesn't have an explanation of why they deposited just in the sky. Like in your case, I had clean shots, showing neither bubbles nor dust, on the same roll. For example the one below. 

I've shot another roll recently and I didn't have any problem except for a single frame, showing a little bubble. Hopefully, it was just an isolated fault! Thanks again ;)

 

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I think we both agree, with perfect shots next to shots full of dust and spots, it's almost like there is some contamination on the rollers as the film passes through the coating machine. I still haven't had the same problem with subsequent batches of CMS20II, so maybe it is sorted?

Edited by 250swb
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7 minutes ago, 250swb said:

I think we both agree, with perfect shots next to shots full of dust and spots, it's almost like there is some contamination on the rollers as the film passes through the coating machine. I still haven't had the same problem with subsequent batches of CMS20II, so maybe it is sorted?

I read again the conversation with Mirko. In fact, as regards the dust he limited himself to say "why it settled only in that part of the frame has yet to evaluated", but he didn't say a word about the bubbles. It could be that they sorted it out, indeed. If I recall correctly, I bought the faulty roll in the winter (and shot it in April)...

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