70mm Film FUN up ahead

Jobo has a foot pump for this purpose, but it probably costs more than 7 dollars. :p
Talking about pumps, I've seen that the Mamiya back can be supplied with a suction bulb to create a vacuum inside, does anybody know the purpose of this? Contax made some cameras with vacuum backs to keep the film flat, but I do not know if this is the case here.
 
It sucks the film down really flat. I would get one if I were you. When doing aerial photography I think the film gets drawn outwards when you put the camera out the plane window. The pump helps with that.

Europanorama knows about this one
 
I've been thinking about how to accurately measure out fifteen feet of 70mm film in the dark.
Up to now my method has been to wrap the core until it is full. This is not too accurate.
Usually I end up with a shorter roll. I'll be posting something on this as soon as I try it out.
 
Maybe if you have a larger cylinder of some kind to spool it onto before wrapping it on the cartridge spool? If you know the circumference of the cylinder you could calculate the number of turns to get the correct length. You would have to have a physical mark on the cylinder to keep control of the turns.
When you say that you end up shorter than 15 feet with a full core, maybe that's just correct for the NDT reel?
 
So far I have pulled out a length of film in the dark, rolled it up, and repeated until the spool "seemed full". It's a total guess but it got me started shooting 70mm.

I have a formica work table in my darkroom, and I was thinking of taping down a three foot wooden yardstick I bought at Lowes. You would attach the spring clip to the 70mm film spool, and roll out three feet of film onto the table, and then wind it by hand (minimizing handling and scratching). Do this four more times in the dark and you've got fifteen feet. Being generous you can have sufficient leader. Scissors you keep in your back pocket so you can find them in the dark.

I load 35mm film cartridges with Eastman XX from a four hundred foot spool of film in the dark and I'm used to that. I call it the "TomA Method" because I learned this technique from him in his Youtube videos. You pull a "arms length" of film, stretching as far as you can, and that is about 36 exposures or so. Has worked for me for years. LOL

Soon I will need to load more cassettes so I can give this a try.

The NDT reels hold 13 feet according to NDT. Less than a roll of 120 in terms of length versus fifteen feet. Also Hasselblads stop running when you finish the length of 70mm film so shorter lengths are never a problem..
 
Kai-san said:
Maybe if you have a larger cylinder of some kind to spool it onto before wrapping it on the cartridge spool? If you know the circumference of the cylinder you could calculate the number of turns to get the correct length. You would have to have a physical mark on the cylinder to keep control of the turns.
When you say that you end up shorter than 15 feet with a full core, maybe that's just correct for the NDT reel?
Click to expand...


You could roll it onto the NDT reel and then cut it. Then wind it onto the film spool and into the cassette...............

You could even make a "loading stand" PVC pipe would work well (maybe)

Hmmmmmmmmm
 
I thought about rolling it onto the NDT reel, but I'm a bit worried about scratching the film with too much handling. I've been looking for a daylight loader for 70mm, but they are rarer than hens' teeth! But a sort of measurement stick or using your arm could work ok, the number of frames on the roll is not that important unless it's too long to fit into the development reel.
 
I inquired with Catlabs about converting the JOBO 20x24 print drum to fit 70mm. I will post their response here when I get it, to add to the info in this thread.
 
Nokton48 said:
I inquired with Catlabs about converting the JOBO 20x24 print drum to fit 70mm. I will post their response here when I get it, to add to the info in this thread.
Click to expand...

Dan,

I just won a JOBO 3013 on EBAY. Only $122.50 including shipping. My hope is that this can be a 2 fifteen foot daylight tank for me using my Nikor reels.

I'll update when I get physical delivery.

I too was thinking about converting a JOBO 20x24 tank (3063???) but the costs are not low. I took notice that cutting down and shortening the overall height is not an issue, and the only difficulty likely will be fitting the lid which might require grinding down these fluted internal ribbs which is only a minor difficulty.

The JOBO 3013 might be the perfect size. We'll see...

Cal
 
Nokton48 said:
I inquired with Catlabs about converting the JOBO 20x24 print drum to fit 70mm. I will post their response here when I get it, to add to the info in this thread.
Click to expand...

That's very good of you Dan, thanks! I did some calculations based on my Beseler 8x10 and 10x14 drums. If the ratio between paper size and diameter is the same with the Jobo 3063 there should be ample space for the NDT reel.
Cal, when you receive your 3013, please tell us what the diameter of that one is. Right now there are zero 3013's on ebay, only the more costly 3006.
 
Kai-san said:
That's very good of you Dan, thanks! I did some calculations based on my Beseler 8x10 and 10x14 drums. If the ratio between paper size and diameter is the same with the Jobo 3063 there should be ample space for the NDT reel.
Cal, when you receive your 3013, please tell us what the diameter of that one is. Right now there are zero 3013's on ebay, only the more costly 3006.
Click to expand...

Kai,

Will do. Also I'm kinda fully rigged. My Linhof Consultant tells me that the 3013 might be a bit too short for two full reels.

I'll let you know. $122.50 is a steal of a price. Includes shipping.

Cal
 
Here is the initial response from Catlabs:

Dan,
All jobo tanks are daylight tanks. If you want to plug the top for liquids, a #6 rubber stopper is all you need. Converting the lid is not easy, and we would suggest getting a new non cog lid unit from the factory as a special order (169$ extra), but that leads to various other issues, as you cannot use a foot pump to open the lid without the cog. I can check the diameter tomorrow, it is close to 30cm.
 
30 cm, that is close to 12 inches! I wonder if he got the conversion wrong? Looking at a picture of the 3063 it would mean that this tank is about 4 feet high!
 
My two Nikor fifteen foot reels are 6 3/4 inches in diameter and 3 inches tall. The Kindermann reel is the same size.

The JOBO 3013 I got for $122.50 includes shipping has an I.D. of 7 1/4, due to the fluting for retaining 5 4x5 films, and stands 8 11/16 inches tall without the cap/top.

Because the cap is conical in shape there is enough negative space in the cap to fit all three reels into the tank.

The I.D. of the fill in the lid requires a 1 1/16 inch stopper to use this JOBO 3013 as an inversion tank. Filled with three reels and water I estimate the total weight to be about 12 pounds. LOL.

In use I found that my stainlees steel Nikor non daylight tank will accomodate my two Nikor reels and can be used as a light safe for two loaded reels. I would pre-fill the JOBO with 4 liters of developer and avoid the long-long fill time by dunking the two reels.

It seems the third reel secures the bottom reels perfectly, as if designed, and the three reels when stacked center themselves.

I used 4 pieces of masking tape to locate where the lid is fully seated and sealed without reels, then I loaded the three reels and saw that the lid can be fully seated. The reels are held snugly and don't rattle of bang the sides when doing inversions. The tank I will use with 4 liters of developer for two loaded reels. The top reel will be used only as a spacer.

This tank was a remarkable deal. I once bid on a JOBO 3010 and got outbidded. The 3010 eventually had a high bid of $275.00.

Again I'm a lucky dude.

Cal
 
Thanks Cal, this tank sounds like it's the real deal! At 6 3/8" the NDT reels will fit nicely into the 3013. I have to keep my eyes open for one of these.
 
I have to consider rotational processing. Does anyone know at what rate RPM a JOBO Processor is programed for?

Thanks in advance.

The bottom of the tank has a barrel that centers reels. The conical taper of the lid likewise centers my reels. Three reels doing a rotory aggitation seems like a way to deal with less volume of liquids.

Cal
 
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