B&W filter for projector?

garry71

garry71

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Garry
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It's a bit of a strange question, but here goes!

Is there a reversing filter which can be used to project B&W negs as positives, so I can have B&W slides?

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Cheers
Garry
 
I keep meaning to try cross-processing a roll of XP2 in E6 chemicals and see what the resulting slides look like... by repute they're a bit green, but I fancy a go...

For your existing neg's I think its down to re-shooting them, using a film copier - used to use Kodak Tech Pan (R.I.P.) film, but I suppose Ilford Pan F plus would do at a push
 
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To get black and white slides the best way is to use the DR5 Chrome process:

http://www.dr5.com/

Unlike the Kodak or Foma reversing kit that use re-exposure to light to reverse the image, the DR5 chrome process is entirely chemical and gives very fine grained positives. Unfortunately its only available at the one lab in the U.S linked above and is fairly expensive because of the postage. The black and white slides look very good as well blown up hugh on a screen.

You usually can't expose at quite box speed, so check what they say about each film type in the link below. Unfortunately some popular films such as Acros 100 don't work in the process for some reason.

http://www.dr5.com/blackandwhiteslide/filmreview.html

I've only used it once, for Tri-X 400 which I rated at 320 as they recommended. The slides came back very contrasty and looked underexposed, so I would shoot it at 250 or 200 and say you shot it at 320 as they ask what you rated it to as they need to know when processing.

I'll post a couple of examples later.

BTW, Rollei ATP or Adox CMS20 are great alternatives to Tech Pan apparently, although you have to dev them in Rollei Low Contrast developer and Adotech developer respectively or they are very high contrast and rated much faster.

I recently acquired 3 rolls of 35mm Tech Pan from 2004 that I am going to have a go with some time and dev in Rollei Low Contrast. First though I'm going to get some experience with developing during the summer.
 
Thanks for the replies.
I never thought of using a film copier, I know my dad had one years ago, I'll have to see if he's still got it.

It's a shame there isn't a DR5 service available in this country, wonder if it's worthwhile any labs here doing it under licence?
 
Its a unique lab, the photographer who developed the process is keeping it as a trade secret known only to the official DR5 lab. They had a unique processor made for it in Italy, so I imagine its a bit more complex than C-41 or E-6 even.

Heres an example of Tri-X 400 at 320 in DR5 Dev-1 (Neutral)

DR5_example.jpg


As you can see it is quite high contrast and looks underexposed, nearly all the pictures on the roll did.
 
I had this thought as well as i recently acquired a slide projector.

What i did was to take the shots normally on B&W neg and have it developed as such, then use a slide copier and some old mounts to expose the developed B&W neg to a B&W neg film, and have that developed as normal B&W neg film. To my surprise it actually works, you get B&W slides this way. It's a little long but it uses standard B&W development and you can pick the shots you want as slides.

The hardest part is getting the exposure right with the slide copier, i got a T2 mount copier and adapters for the film camera i was using to copy with and my DSLR, i took shots of the slides with the DSLR and judged them for exposure on the computer then used those settings to make the slides on the film camera, works very well this way.
 
You would have to experiment first as its only designed to be used with Foma R100 which it seems is actually no longer around although it depends on which website you look at as to whether that is true.

Ilford do a guide to reversing their B&W films using light:

http://www.ilfordphoto.com/applications/download.asp?n=1179&file=FINALPDF_Reversal_processing_Factsheet.pdf

You do need some separate raw chemicals such as potassium permanganate, these can be obtained from Silverprint:

http://www.silverprint.co.uk/ProductByGroup.asp?PrGrp=49

The DR5 process is worth it BTW if you have multiple rolls of film because the postage back to the UK is a flat rate that's enough for about 5 sets of slides from 5 films so if you send multiple rolls in then its much more economical. I would be careful using Tri-X 400 though as everyone I've found who's had it done in DR5 has had it come out like my ones, underexposed and contrasty.
 
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