Efke IR820

[Fotohuis]

Here is a comparison between the Rollei IR820/400 and the MacoIR820C:

http://www.fotohuisrovo.nl/documentatie ... IR-400.pdf
and
http://www.fotohuisrovo.nl/documentatie/IR820c.pdf

and the 1:1 practical results under THE SAME circumstances:
http://www.moersch-photochemie.de/

Galerie (=gallery) --> Vergleiche --> Filme

Now you can see the differences between a film sensitized till 750nm and then have a fast drop in sensitivity and a film almost straight going to 820nm.
I am very interested how the new Rollei IR850 will be specified. As Rollei/Maco has much experience in the manufacturing (by Efke in the past) of I.R. films on their specifications this IR850 based on APX100 (Agfa) emulsion could be very interesting.

On the other hand a film sensitized till 750nm ( and then have a fast drop) can be loaded and unloaded in subdue light and is usable with cameras with IR LED auto transport.
It's just what you're seaching for.

[Wirehead]

Well, there's a pretty big difference between the two from what I can see. Yes, there's wood effect in both shots, but it's more intense in the top one (assuming that's the IR820c).

I suspect a carefully formulated IR850 could best IR820c. Consider Konica 750, which, because of the valley in IR sensitivity at the green range, was able to get IR effects with just a red filter.

[ADOX Fotoimpex]

Dear Robert,

this is an interesting post you make.
Could you (and your afiliate MACO) please explain what you mean by FOTOKEMIKA misusing a MACO patent in the production of the IR film ?
This is a serious statement you are making there which could affect all our businesses.

I would very much welcome if you could indicate the patent registration number or anything else that can possibly proof your statement.

The IR 820 is a standard ADOX KB 21 emulsion (Fotokemika bought these patents in the 1970ies, I guess there is no doubt about this) which just gets sensitized after remelting prior to coating with a sensitizing dye from a large and well reputed supplier of chemical products.

I am really curious when do you think MACO bought the rights to the emulsioning technology from Fotokemika or the rights to the sensitizer which is available off the shelve. The supplier then would have to immediately withdraw the sensitizer from the market and/or Fotokemika would have to stop making any 100 speed film.

Thanks for clarifying this at your earliest convinience.

Best regards,

Mirko

[foolscape]

I guess next somebody will be talking about restarting production of Konica 750 or something.

T'was a sad day when I heard that Konica had stopped production of this film. I'm shot hundreds os rolls of it in 120. Most of my best-selling images are done on it. I have 3 rolls remaining in my fridge, awaiting the summer's heat.

Ah, to create, perchance to dream. If only someone would announce production of this film...

--Gary

[Fotohuis]

The whole story is in detail explained by Rollei/Maco in this tread by Mr. Junghans (marketing manager):
http://www.aphog.de/forum/viewtopic.php ... bb1bb104a0

No need for further comments on this Efke I.R. film.

[Keith Tapscott.]

The whole story is in detail explained by Rollei/Maco in this tread by Mr. Junghans (marketing manager):
http://www.aphog.de/forum/viewtopic.php ... bb1bb104a0

No need for further comments on this Efke I.R. film.

It would be interesting to read this translated into English.

[Wirehead]

I read it through babblefish and couldn't figure out what the big deal is. The impression the translation gave me was that the IR recipe was Efke's recipe all along.

But then again, I'm reading a rough machine translation. I speak American real goodly I does, and that's about it.

[Fotohuis]

>> I read it through babblefish and couldn't figure out what the big deal is. <<

Same to me. But I am sure Mr. Junghans from Rollei/Maco can give you all necessary info for the Rollei/Maco products and the detailed product information of their previous Maco IR820C film, made by Efke on Maco receipture and specifications.

junghans@mahn.net

Enjoy your I.R. photography, whatever type of film you're using!

[ADOX Fotoimpex]

I don´t want to translate all of Maco´s statement but they have now clarified the situation in a satisfactory way.

Apparently "translation mistakes" have been made when above statements like "misusing a patent" or "violating a patent" were posted.

De facto Maco does not own any rights to the efke emulsions rather they had a marketing agreement with Fotokemika in the 90ies which was abandoned in 2002 when they decided to switch their production to Germany.

Current Fotokemika films are now beeing produced legally with Fotokemikas own technology and thus may be sold and resold all over the world by Fotokemikas trade partners like Fotoimpex (Europe) or Freestyle (USA) without any legal obligations.

Best regards,

Mirko