Developing Error?

Southdowns

Southdowns

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Mark
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This is a 100% crop from a roll of 120 Neopan 100 Acros, the first one I've developed myself. It's from the sky area; what might be causing the black specs? They're on a lot of the shots.

20140622-135342.jpg by MarkBerry1963, on Flickr
 
Black specs are clear specs on the negative. To have them so evenly spread is rather strange.
the nearest to this that I have seen was caused by bubbles.
 
Thanks Terry. I can't see how it could be bubbles, but I guess anything's possible. It is on only one of the two films I developed, so there's hope!

Does anyone else have any ideas?
 
H'mm only a guess as it would seem the neg is covered in pin holes i.e. bits on the film not reacting to light........maybe something wrong with the emulsion on the plastic film base.
 
That is possible. The film with the issue was of unknown origin, while the one that was OK was new.
 
It's generally a good idea to limit the possiblilty of errors when you first try dev'ing at home. You really want to work with in-date film, exposed in a camera with accurate shutter speeds, with a fully functional accurate built in lightmeter or a tested and calibrated hand-held lightmeter, fresh chemicals made up to the correct ratios, at the correct temperature and dev'd for the right amount of time.

At least if you do all of these things you have a better chance of getting correctly processed negs, as soon as you start adding unknown variables like outdated film or chems you're asking for trouble.

Of course once you're happy processing your own stuff you can start experimenting but while you're learning make life easy for yourself and control as much as you can.

BTW I think Brian @excalibur2 may have a point and you may just have a dodgy roll of film.
 
I had similar marks on a 120 film in my Mamiya C220. Traced it down to flock from the flap that is raised to change lenses. Southdowns did not say what camera he was using but dust from something moving inside could be attracted by static to the film.
 
Thanks Nick and David. Yes I agree with keeping it all known at first; it's just that the film was given to me. I don't know that it was out of date (I didn't think to check!), just that I don't know it's life prior to receiving it :). Everything else was brand spanking new and done to the book, and apart from the specs, it went pretty well I think. I'll post some shots up separately.

David it was a Mamiya 645 :)
 
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