Re: about 70 mm back

["David M. Young" <david@xxxxxxxxxxxxx>]

At 09:58 AM 12/23/98 +0800, you wrote:=20
>>>>
> I am planning to bid for a Hasselblad 70 mm back on ebay in order to take HIE in medium camera.
> Do I also need canisters?  How does it work? =20
>  =20
> I understand that we can buy HIE in 70 mm format in bulk roll.  Should we load it into canister in advance ?
> Could any body explain to me how to load HIE in 70 mm back?  Also, I need information of where (price?) to buy HIE bulk rolls.  Please note my location is in Taiwan, I am going to USA next month.=20
> =20
> Any reply will be highly appreciated!!
>   =20
> Samuel
<<<<

Samuel,=20
I've been shooting 70mm HIE in a Bronica for a while now with good success, so I hope I can be of some help.  First of all, make sure you can develop and print the film!!  Most labs won't take the stuff, so you'll have to search one out or develop it yourself!  You may find a lab that'll do it in a dip-n-dunk processor if you cut no longer than 2.5 foot lengths (same as 120 film), and if you do it yourself you'll need the appropriate size reels. Jobo makes 70mm reels that hold 5 or 15 foot lengths, there are a few others out there that make 15 foot reels.  The canisters hold a maximum of 15 feet, but you can always load it with less.=20

The only way you can get 70mm HIE is in bulk rolls that are 150 feet in length. If you ask someone for 70mm HIE they won't be able to find it in the Kodak catalogs, it's listed as "Aerographic 2424" and in the Aerial Film section of the catalog.  Most any Kodak supplier should be able to order it for you and the price should be around $200-$250 (us$).  Most dealers DO NOT carry it in stock, and delivery from Kodak can be a few days to several weeks depending on where you order it from and where you hit it in Kodak's production cycle.=20

Yes, you will need canisters, and unlike 35mm the film feeds from one canister into an empty one... so you'll need to leave yourself an empty can when you pre-load them.  The cans have snap-tops and are reusable. Many people say you can buy used cans and I've seen some on e-bay occasionally for about $5, but I personally order mine new from B&H for about $35 each...  people may balk at that price, but the used cans I've seen all have deteriorated felt that's either gummy or dry and flaky.  I just can't see why people pay all that money for the film and processing and go to the hassle of hand-loading the canisters, then go cheap on a can that could ruin the whole effort. YMMV.  Either way, keep an eye on that felt and replace it or the canister when it starts to go bad.

As I said, you'll want to load 15 feet or less into the canister, so you'll need a darkroom or a changing tent (most changing bags are to small to do it without smudging the film).  If you use a tent, make sure it's IR-tight... Photoflex's tent, for example, is not IR proof; I use one called a "Shadow Box".  Oh, and like 35mm HIE, the canisters are not IR-tight so you'll need something to hold the loaded canisters.

>From there on it's a lot like handling 35mm HIE.  You'll need to load and unload the back in a changing bag, etc...  I suggest you read all the 70mm articles on WJ's Photo Homepage at http://www.a1.nl/phomepag/markerink/mainpage.htm, especially the one called "How to cope with Kodak Infrared HIE 70mm, by Jim Henderson: 70mm FAQ".  They were really helpful to me when I started shooting 70mm.=20

Cheers and good luck
D.


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