PDA

View Full Version : Bulk film - estimating length

Nomad Z
06-08-2011, 10:00
I just got a Watson 66B bulk loader for a cheap price on eBay, and it turns out that there is film in it. I just loaded a foot or so into a tank, and I'm about to develop it, in the hope that there are some edge markings.

While it was in the changing bag, I took the lid off and measured the diameter of the roll of film - it's about 48-50mm (nearly 2 inches). Any suggestions on how much film this equates to? There was some space around the roll to get the fingers in a bit, so I'm guessing maybe half of a 100 foot roll.
Nomad Z
06-08-2011, 10:29
And the mystery film is....


...Jessops Pan 100S

My initial searches indicate that this is actually Agfa APX100. Off to do some more searching...
tj01
06-08-2011, 10:34
About 4 rolls
kully
06-08-2011, 10:57
Jessops 100S is (was) APX100.
nikon_sam
06-08-2011, 11:08
The roll spool measures at 1" so I'm guessing not that much...3-4 rolls of 36 exposures...
Nice that you didn't just open it up and expose it all...
Nomad Z
06-08-2011, 12:05
Just been crunching numbers, and I get a bit over 5 rolls. If it's 0.15mm thick, then, from 48mm to 25.4 is 76 layers. Totalling the circumferences of the layers, accounting for the reducing diameter of each, I get about 8.77m of film - 5.36 rolls assuming 1.64m per roll. If that's correct, then working outwards to get 30.5m takes another 108 layers, and gets to an outside diameter of about 80mm - does that sound right?

I'm glad it's APX100, assuming Rollei Retro 100 is also APX100 (because I rather like that). Yes, it was a good thing that I didn't open it up - I had noticed that there was some weight moving around inside, so just opened the loading door instead, and found the end of the film poking through. Not a bad deal for 99 pennies...
nikon_sam
06-08-2011, 12:15
^^^^Okay...I thought I was a bit obsessive with numbers and things but you have taken it to a new level...
Find five empty cassettes and just roll them...
Nomad Z
06-08-2011, 12:59
^^^^Okay...I thought I was a bit obsessive with numbers and things but you have taken it to a new level...

I do mechanical design, so numbers, particularly dimensions, are par for the course for me.


Find five empty cassettes and just roll them...

Don't have any. :) Planning an order to Maco Direct soon, so I'm thinking of getting 10 of the metal reusable ones (and maybe a bulk roll of Efke 25, since rolling that will actually save money).