Regarding the Yashica Atoron film, is it due to uneven development?

[APL]

Hello everyone, I've recently been trying out some photos with a Yashica Atoron. I split a roll of 35mm FOMA Pan 200 film into two 9.3mm films and shot them in bright afternoon sunlight. The results were great, and I really like them. However, there's a small problem: a narrow strip with lower density appears at the edge of the film compared to other areas. I'm wondering if this is due to uneven development. So, I modified an old Paterson developing tank spool to process these negatives. This tank was originally designed for 35mm and 16mm film; I added grooves to the spool to allow it to process 9.3mm film. I usually use a semi-static development method: agitate for the first minute, then let it stand for the rest of the time. I use a Fuji Microfine at 20 degrees Celsius for 10 minutes. This works very well for developing 120 and 135 photos, but I'm having problems developing 9.3mm. This is the first time I've encountered this issue. I'm curious whether it's due to my modification of the spool causing difficulties in chemical flow, or if it's caused by my development technique. I welcome any discussion. Thanks

 

[koraks]

This result looks as if the developer didn't cover the entire reel. Ensure that the reel sits all the way at the bottom of the tank (also after agitating), and use a volume of developer that is guaranteed to cover the reel in its entirety. Using a more frequent agitation routine will also help reduce this problem (and avoid other possible problems).