It could also have been a piece of dirt that prevented that part of the image from being fixed. After rinsing, when exposed to the light, it would have continued to develop. In some thirty years of darkroom work, I encountered a number of weird effects that were undoubtedly the results of bad chemistry or film imperfections. Lots of opportunity for things to go wrong.
On Oct 24, 2011, at 12:57 PM, Mark C wrote: > Thanks, Paul - In the case of HC-110 that would have to be a drop of liquid > concentrate, but that does sound like a likely explanation. > > Mark > > On 10/24/2011 7:12 AM, Paul Stenquist wrote: >> Hi Mark, >> I think a light leak that tight and tidy is unlikely. it would probably be >> more diffuse. I'd bet on something going wrong with the chemistry, perhaps a >> few grains of undissolved developer that stuck to the film but were >> eventually washed off. >> Paul >> On Oct 23, 2011, at 10:40 PM, Mark C wrote: >> >>> Oops - put the first link in twice. Here's the second: >>> >>> http://www.calarti.com/peso/2011-0434_tu2.jpg >>> >>> On 10/23/2011 10:38 PM, Mark C wrote: >>>> Submitted for your perusal... here's a photo I snapped a week ago in a >>>> state park near Augusta, Michigan. Notice the globular lights on the left >>>> side of the frame and what appears to be light shining towards the center >>>> of the frame: >>>> >>>> http://www.calarti.com/peso/2011-0435_tu.jpg >>>> >>>> Here's the frame taken immediately before that one: >>>> >>>> http://www.calarti.com/peso/2011-0435_tu.jpg >>>> >>>> Yeah - I drew the circle on the second one to show where the lights were >>>> on the first. At first I thought that this must be lens flare of some >>>> sort, but I'm certain the sun was behind me. The trail proceeds to the >>>> north and while it twists and turns a bit as it follows the edge of a >>>> sinkhole lake, it never strays more than from NW to NE. The shot was taken >>>> around 2 PM local time last Saturday, which I reckon to be about 11:30 >>>> true local time - which would put the sun in the south-southeast area. >>>> Behind the bushes that the light is emanating from is a big empty field - >>>> just soybean stubble for a couple hundred yards. >>>> >>>> Taken on an Mz-S with an FA 20-35 f4 zoom, #29 deep red filter, lens hood >>>> in place. No Photoshopping other than contrast and tone adjustments. The >>>> photo was shot on Neopan 400 pushed to ISO 16000 and developed in HC-110 >>>> Dil B. I checked the negatives and there are no developer / agitation >>>> marks. The lights are in the negative as areas of density. The area of >>>> density does extend beyond the frame, into the sockets on the film. This >>>> is the last frame on the role and there are no kinks or folds on it (or >>>> elsewhere on the roll...) >>>> >>>> I'm guessing a pin-hole light leak in my changing bag? Any one else ever >>>> get this sort of thing? >>>> >>>> Mark C. >>>> >>>> >>>> >>>> >>>> >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> PDML@pdml.net >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >> > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
