"Lightproofedness" of plastic cassettes for bulk loading

I've used lot of 'em. A cassette is only as good as the brightness of the light you load the camera in. Should be good enough. Don't load film while standing on the beach in July at high noon.

 

I use them all the time - no problems, even loading under the Florida sun at noon in July (actually , not quite true - I do try to shade the open camera with my body at least)

 

I have plastic cassettes I have used for many years and never had a problem, unless the cap came off. I use a tape label and be sure the end comes onto the end cap. As said above, still best to load in shade.

 

I don't like the plastic cassettes. I have had the end come loose and ruin film.

 

I've had better luck with plastic than with the metal and actually prefer them. The caps seem LESS likely to come off to me, requiring a twist not just a straight drop to pop off.

 

The plastic ones I have are the threaded screw-in type. I imagine they are safer than the friction top. I have never had mine come off

pentaxuser

 

They will be light-tight, however being plastic they may generate static electricity and attract dust. This I know as fact. Metal ones if you must use re-loadable

 

The only plastic ones I've used are the screw on type, and I preferred them for that reason. But they also seemed to deform less than the metal ones which can easily warp and become un-light tight (while the plastic are, well, more plastic and seem less prone to warping.) I have also dropped the metal ones on the spool and had the cap pop right off, which has never happened when I've dropped the plastic ones.

Disclaimer - my experience with metal film cartridges dates from the 1980s and was pretty brief before a friend recommended the plastic, which I was happier with and have used ever since. It's quite possible today's metal ones are better. I don't use much of either anymore as the savings from bulk loading are much less than they used to be. I do load some Arista branded Tri-X though, partly because I like shorter loads than 36x for the stuff I usually use it for.

I have never had any problem with static or dust with the plastic. I can see it as a possibility but it seems a stretch to me in practice. I blow out the felt with canned air and keep them in sealed bags when not in use.

 

I like the plastic ones best but be forewarned: On the cap that screws in, there is a tiny 'arm' of plastic that fits perfectly over the felt. Make sure that it does because you can screw the cap on where that arm will be 180 degrees away from the felt. I once got a Russian plastic cassette that did not have this arm, though. I did not trust it to effectively block all light. - David Lyga

 

I guess all plastic cartridges with that "arm" originate from the same manufacturer: AP
At least the ones I saw all looked the same.

 

Perhaps, AgX, but I do not know why the Russian ones did not have that important arm, whose purpose is to block light at the most vulnerable point where the film exits the cassette. - David Lyga

 

Aside of very old cassettes, type 135 metal cassettes (single- and multi-use) do not have that arm either. The idea was that plush protruding at the short side would seal the slit.
So when starting from the standard type 135 cassette when designing a reusable plastic version with twist cap, one would not necessarily consider an arm.

I shall have a look at those soviet cassettes.

 

Correct, ApX, the plush felt sticking out from the sides of metal cassettes is the baffle that the 'arm' on plastic cassettes provides. When you screw a cap onto a cassette, on the other hand, the 'sticking out' of felt becomes impossible to have; thus, the 'arm'. - David Lyga

 

Whether a cap is screwd on or clipped on, the interference with the plush should be the same.

But over time a number of type 135 cassettes have been designed, all varying from each other.

 

They do seem to unscrew with little effort. To make myself feel better, I put a little blue painter's tape on so that a edge of the tape covers the edge of the cap. It gives me something to make note on as well.

 

I use a mini Avery pressure sensitive label for same purpose.

The spool in the OP first post is not the original pattern it is from a factory crimped cassette, it is more difficult to secure the film to this type, less area to stick to.

Otherwise it should be ok.

 

+1

I've used them for more then a decade now, no problems.

 

I've been using the plastic cassettes successfully since around 1990. No problems with light leakage.

One small issue I've found is that after taping the film to the spindle, the slot between the light traps on the cassette can be a bit difficult to locate at times and the cassettes are a bit tricky to stretch open a couple of mm to locate the slot and slide over the film.

I still have about 50 Ilford cassettes from the late 80's - early 90's which are a delight to load. The modern metal cassettes are very light guage metal and I have occasionally damaged them when attempting to press on the end caps. The very edge of the cassette body can bend and distort when pressing on the end cap.