From: edwin m (email suppressed)
Date: Thu Oct 14 2010 - 05:00:30 PDT
it's because the height of the lower part of the light trap (the bit that's on the top part of the spindle) is determined by how the spindle is set up. so by only attaching part, or by setting it up for s8, you can make the distance between the top & bottom of the light trap larger by about half an inch. obviously this doesn't actually guarantee fogging & they're perfectly usable set up that way, it's just one more variable that means you might end up with fogged film. just as likely that it's the camera, or the conditions you wind onto the spool, or loads of other stuff, but ben seemed to think it was the lomo & it is quite a well-known problem.
personally i've never had it happen either, but i know folks who have
edwin
To: email suppressed
Date: Thu, 14 Oct 2010 07:35:47 -0400
From: email suppressed
Subject: Re: [Frameworks] The Russian LOMO Tank Light Leak.
I don't understand this, because the light trap is at the top of the spindle, so it shouldn't make any difference how full the tank is below the light trap. If light is getting in, it will fog some of the film regardless of how full the tank is, surely?
I processed about thirty feet of 16mm in the bottom spiral the other day and there wasn't a hint of fogging. I've also processed single rolls of Super 8 on the bottom spiral without any problems. Either there's something wrong with the light trap or it's damaged or something, or else it's a camera fault.
Many Bolexes have very small light leaks that are only revealed when shooting timelapse, or when the film sits in the chamber for a while between shots. In my experience this usually results in a horizontal bluish stripe on individual frames, or sometimes a vertical bar of light on one side of the frame.
Nicky Hamlyn.
-----Original Message-----
From: edwin m <email suppressed>
To: email suppressed
Sent: Thu, 14 Oct 2010 11:57
Subject: Re: [Frameworks] The Russian LOMO Tank Light Leak.
it's quite a common problem i think. it's caused by the light trap at the top (where the central column passes through) - unless you're talking about something altogether different.
the tanks are designed to take s8, 16, 35, but because those films all have different widths, there are ways of setting it up that allow light to pass through the light trap. with 35 it's never a problem, but with 16mm it's always best to load both parts of the spool (so 2x50ft or 2x100ft processing in the same tank, depending what size yours is). doing that, you can't get any leak unless it's a faulty tank. for s8, you absolutely have to do two at a time, & even then there *could* be a leak, though i've never had one.
if you have to process single spools, you can do it in subdued light like amanda advised, or you can put something in the base of the tank that holds the spool up higher, as long as it won't move and damage your film. remember that doing either of these needs the same amount of chemistry as a double spool (so that the film remains submerged), but also that the higher volume of chemistry means it'll get depleted slower, so can go further.
hope that's useful, sorry if i've just misunderstood the problem
edwin
From: email suppressed
To: email suppressed
Date: Wed, 13 Oct 2010 20:59:46 -0300
Subject: Re: [Frameworks] The Russian LOMO Tank Light Leak.
I actually did have this problem with one lomo tank once, and I've used several. When I was in Rotterdam, there were several lomo tanks and there was one particular tank that had a light leak at the opening... the little round thing at the base of the handle in the centre didn"t have a tall enough lip.
solution: i would process in subdued light (but not total darkness)... and whenever i wasn't pouring chemicals, i laid a black towel over top of it (black towel doubled up on itself).... and that did the trick.
of course i was using really low iso films... but this was the solution. turn the lights on low, and grab a black towell!
adc
Le 13-Oct-10 à 5:45 PM, email suppressed a écrit :
I have never had light leak problems with a LOMO, having done several thousand feet over the years without a hint of fogging etc. Have you tried filling the hole?(!)
If you've been using a Bolex, it's more likely to be that, specifically if you've been shooting single frames / time-lapse,
Nicky Hamlyn.
On 13 Oct 2010, at 21:21, ben russell wrote:
Hand-Processers,
Have any of you run into a problem with light leaks when using the Russian LOMO spiral tank to do B/W reversal film processing? There's a small hole in the turning knob of the LOMO, and some recent processing issues make me think that it may be the source. Any tips or tricks would be appreciated.
Yes,
BR
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