The negatives are showing up as positives on my screen. I presume they are supposed to be negatives and not a positive process right? They are not prints, right?
You have only included the frame markings in the first post, but if they are still developed adequately on subsequent images, then that rules out film-coating and processing issues.
Do you have any anti-reflective material coming loose in the mirror box?
Sorry yes the scans are positive scans. So there is a white fog on the frame edges negatives that seems to indicate either not getting light or not getting development. As the film edges are developed that leaves me looking at in-camera problems.
I opened the shutter and looked inside the camera and I really can't see any problems. It looks great in there, nothing appears to be blocking the frame.
The two times it has happened have been with a very cold camera. So I'm racking my brain to think what could be happening, maybe sticking shutter or loose film or...?
I don't know if that camera has a bellows, but if it does, check it. It looks to me like it's out of focus like its in front of the film plane some how.
I noticed that too that there seem to be focus issues and I'm not normally that bad with focusing. It's not a bellows camera but this does support the theory that, in the extreme cold, the film is not winding properly (it has a motor drive) and buckling out so that the centre is out of focus and the sides are not getting any light.
Originally Posted by kreeger
Have put two rolls through the camera now, indoors using identical development and no issues.
I think I have the answer for you (or am pretty sure), as I have had the same problem. I also use the 645n2, and I see from the first negative that you used the 45mm lens. This has the petal shaped lens hood, and I am sure that you have put it on slightly wonky. If you don't match up the white dot on the lens, and the white dot on the hood and rotate clockwise so as the word "Pentax" is on top, your hood will not be on straight. If you take a look at your lens hood you will see my thinking behind this, as the dark areas on your image mimic the dips either side of the petals on your lens hood. Could it be stray light entering the lens?, or the hood obscuring the image area? All I know is that by making sure that my hood is on straight I have not had the problem return.
I could be wrong in your case, but ask yourself when you retested the camera if you used the same lens, or correctly fitted your lens hood, if fitted at all. It is easily done.
I hope this helps.
All the best
Well now... That would certainly be a simple explanation wouldn't it? I did have the hood on the camera and I have never really paid attention to lining up the white dot. I'm going to test this theory out but this could be it....
I hope it's the answer for you, as I know how frustrating these problems can be, and how tedious further testing will be for you. If I get time tomorrow I will dig out a negative with the same problem and scan it to post here.
Cheers and good luck
Originally Posted by adelorenzo
Impressive—I can't wait to hear a confirmation of the suggestion. Feels like getting towards the end of a whodunit!
Originally Posted by adelorenzo
Please find attached a few contact sheets along with a few images from the contact sheets that sort of tell the story of why I came to the conclusion that both yourself and I have suffered from the same issues with the Pentax 645n2 fitted with the 45mm lens with Petal Lens Hood. It is worth noting that these negatives were made in 2003, and I was very new to photography and the darkroom, and also the Pentax was a new toy to me. These negatives were only the 15th roll on-wards of film that had gone through the camera. I was very confused :eek: when I developed my film as to what could have been the problem, so will explain how I came to the conclusion that the issue was the Petal Lens Hood and nothing to do with my development routine.
If you look at the first two contact sheets you will notice that not all of the images suffer from the issue, that is because the images that don't were made with the 150mm lens, and all of the images with the issue were made with the 45mm lens complete with Petal Hood, which points to an issue with that particular lens.
On the third contact sheet shown, all of the images were made with the 45mm lens with Petal Hood, but while exposing this roll of film I noticed that the lens hood was fitted incorrectly, so put this right, which as I have mentioned before, is done by lining the white dot on the lens with the white dot on the hood and turning clockwise so that the word "Pentax" sits on top of the hood. You will see that by doing so the next two images made, which are the two on the top of the right hand column of the contact sheet, are without issue.
From studying these contact sheets I sort of came to the conclusion that by not having the Petal lens hood fitted correctly, along with a harsh side light, these issues would arise, though if you look at the river image that I have attached, scanned from one of the contact sheets, that is not strictly true, as there was no side light on this particular occasion.
Since making these images, when using the 45mm lens with Petal Hood I always double check that the hood is fitted correctly, and if there is a harsh side light I use my hand to cast a shadow over the glass, and I have never had the issue since, some nine years later, so must be doing something right!
I have also attached some images made from those contact sheets to prove that a silk purse can be made from a sows ear :) (IMO)
Attachment 61170 Attachment 61171 Attachment 61172 Attachment 61173 Attachment 61174 Attachment 61175
I hope this helps.