Can someone explain 70mm film please?

[StoneNYC]

Richards of Hulls, film process sink lines, nitrogen burst systems.. God save the Queen!

http://www.richards.uk.com

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I'm confuse this does not look like a round daylight loading tank the size of one 70mm spiral, I thought that's what hulls had?


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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[StoneNYC]

There are many reasons that 120 and 220 were very popular formats for professional photographers but 70mm was not. 70mm was successful for applications that absolutely required a large number of exposures i.e. 70 and had the extensive engineering support necessary to keep it running. Examples are NASA/military/scientific applications and mass portrature.

120/220 is far better suited to satisfy the needs of photographers. Photograpers have an enormous number of variables to deal with when preparing for shoots and making photographs. 70mm adds unneeded complexity. Mechcanically the magazines are not robust. They require a great deal of attention if they are to be reused and daylight loaded. NASA used modified mags that were darkroom loaded by qualified technicians.

120/220 has the advantage of film that is factory spooled in a clean humidity controlled environment that is momentarily exposed to the environment when reaches the exposing film plane. Camera interface and film processing problems are very rare.

70mm has many opportunities for problems unless the equipment and materials are carefully maintained and used.

Bob

I'm learning this the hard way...


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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[snaggs]

I'm confuse this does not look like a round daylight loading tank the size of one 70mm spiral, I thought that's what hulls had?


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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I gave you a link to there website, dig around! They sell hundreds of things. I'm thinking their tank is this;



Though they may have a round one. I'll wait till they all get back to me.

Daniel.

 

[StoneNYC]

I gave you a link to there website, dig around! They sell hundreds of things. I'm thinking their tank is this;

View attachment 60417

Though they may have a round one. I'll wait till they all get back to me.

Daniel.

Square wastes too much developer, my "tank" us EXACTLY the right size, the spiral reel fits snugly in the round tank and I can measure exactly 1/2 gallon if developer into it to cover the film. I would expect an official 70mm daylight tank to be the same considering how much developer is used per spool.


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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[MattKing]

Square wastes too much developer, my "tank" us EXACTLY the right size, the spiral reel fits snugly in the round tank and I can measure exactly 1/2 gallon if developer into it to cover the film. I would expect an official 70mm daylight tank to be the same considering how much developer is used per spool.


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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If you find yourself frequently concerned with wasting developer, you should seriously investigate incorporating a replenishment routine into your workflow.

 

[StoneNYC]

If you find yourself frequently concerned with wasting developer, you should seriously investigate incorporating a replenishment routine into your workflow.

I would if I understood how it worked, I never understood replenishment, isn't it just the same stuff as the regular developer? Or is it different somehow?


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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[MattKing]

I would if I understood how it worked, I never understood replenishment, isn't it just the same stuff as the regular developer? Or is it different somehow?


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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Depends on the developer.

If you use X-Tol, the developer is it's own replenisher.

You mix up 5 litres of developer from the package, and then divide it into at least two containers - a working solution container that is at least as large as your largest developing tank and then one or more containers for the rest - it will be used for replenishment.

Each time you develop film, while the film is being developed, you put 70 ml of the replenisher into your working solution container for each 80 square inches of film being developed (a standard 120 or 135-36 roll of film is equivalent to 80 square inches). Then when the development is finished, you pour the developer back into the working solution container. There will be some excess, which you discard.

The developer activity will vary slightly at first, but once it stabilizes, it gives results that many consider better than one-shot.

Over time, you may wish to experiment with slightly more or slightly less replenishment. And if you use unusually sized films (like 70 mm) you will need to calculate how many square inches of film are involved and adjust the replenishment amount accordingly.

Once you use up the balance of the 5 litre package, you just mix the next one, and use all of it for replenishing.

One 5 litre package will provide replenisher for about 70 rolls. Thus, this is best suited to those who shoot 70 or more rolls each 6 months.

 

[polyglot]

Dead Link Removed, using Xtol as the example.

 

[Sirius Glass]

What he said. That is what I have used for years.

 

[StoneNYC]

Thanks guys! How do you calculate for time? Like if I only develop twice a month or something.


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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[polyglot]

Replenishment is really only useful if you're developing quite a bit more than that. For Xtol though, one would normally replenish one roll's worth from a 2L working solution after about 1-2 weeks of inactivity. But your process isn't going to be very well controlled with those big gaps being the norm rather than the exception.

If large-volume tanks are causing you wastage (i.e. quantity required for coverage is much greater than quantity required for capacity) then you might want to look at using more-highly-diluted developers. Too bad if you wanted silver-solvent (grain-smoothing) effects though.

 

[StoneNYC]

Replenishment is really only useful if you're developing quite a bit more than that. For Xtol though, one would normally replenish one roll's worth from a 2L working solution after about 1-2 weeks of inactivity. But your process isn't going to be very well controlled with those big gaps being the norm rather than the exception.

If large-volume tanks are causing you wastage (i.e. quantity required for coverage is much greater than quantity required for capacity) then you might want to look at using more-highly-diluted developers. Too bad if you wanted silver-solvent (grain-smoothing) effects though.

Well I do batch runs, I have found that time is more a factor than usage with Ilfsol 3 I can EASILY reuse it to process 4 rolls adding about 30 seconds to each run if I'm doing it all in the same day. Even though its supposedly a one shot developer.

I usually do about 10 rolls at a time. Once I hadn't processed for a while and discovered I not had enough extra developer to make a full new batch and I just guesstimated and used 2 MONTH old one shot developer that already had 5 rolls run through it, added about half the normal amount as "replenishment" and then halfway the 30 second increments and did 8 rolls with respectably usable results, I think I was at 15 minutes on the last one (this is a developer that is normally a 4 minute developer) so I'm open to replenishment as an option, but you're right I don't like diluting too much, so perhaps I'll just stick to spending money and getting good and more foreseeable results.

BTW I am not normally so careless, but the shots weren't super important and I was curious if I could "DO IT" especially on a one shot developer.


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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[polyglot]

Or you could use rotary development, very little volume is required. Jobos are $$ but you can get cheap roller-bases and run whatever tanks on them.

Drawback there is constant agitation of course, so shorter toe in general and reduced film speed in some devs.

 

[Sirius Glass]

Replenishment is really only useful if you're developing quite a bit more than that. ...

Actually I have used it for even lesser amounts and for longer time periods between and still got great results.

 

[polyglot]

Flickr 2405 group created! I have 300' and snaggs has 450' of it; I know there's a bunch of it out there 'cos the canuck on ebay we bought it from has sold 15,000' of it in the last year.

 

[StoneNYC]

Flickr 2405 group created! I have 300' and snaggs has 450' of it; I know there's a bunch of it out there 'cos the canuck on ebay we bought it from has sold 15,000' of it in the last year.

Why so specific?? why not just Aerial film... or Kodak Aerial film? lame... I don't have any double-x

 

[polyglot]

There's already an aerial film group and a double-X (5222) group but it excludes the aero double-X. Plenty of other film-specific groups out there for sharing techniques/results, just not for 2405 yet.

In other news, I now have a 70mm back attached to my RZ and have made a couple of 2405 tests by taping it into 4x5 holders & developing in a 3010. Now I just need one more cartridge to turn up in the post and I'll be able to actually shoot some properly.

 

[StoneNYC]

There's already an aerial film group and a double-X (5222) group but it excludes the aero double-X. Plenty of other film-specific groups out there for sharing techniques/results, just not for 2405 yet.

In other news, I now have a 70mm back attached to my RZ and have made a couple of 2405 tests by taping it into 4x5 holders & developing in a 3010. Now I just need one more cartridge to turn up in the post and I'll be able to actually shoot some properly.

I would send you one but I only have 5.

Go on ebay, spend $15 on one of the 15 foot rolls of Kodak Panatomic-X it comes WITH a roll PRE loaded with pan-x just shoot that first then re-use the roll.


~Stone

The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

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