[pure-silver] Re: Maco film

On 15-Jul-2006 Christina Z. Anderson wrote:
> Hi all,
> 
> I mentioned Maco IR820C film a while back seeming to be the same as the new 
> Maco/Rollei 820C film and someone said it was not.  Could that someone tell 
> me how it is different?
>

The films are different.  The names are "Rollei Infrared" and "Maco IR 820c". 
While both show a spectral response ending at about 820 nm in the IR, the
spectral response curves shown in the datasheets are very different.  The new
Rollei curve has a response that falls rapidly above about 725 nm, while the
Maco film has a fairly flat response to 800 nm.  I've used the Maco film and
had good IR effects, such as white vegation using a B+W 092 filter.  I haven't
tried the new Rollei film yet.

Some other discussions with links to the datasheets:
http://www.largeformatphotography.info/forum/showthread.php?t=17673 and
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00Gwn7
 
> Also, yesterday I developed a roll of the old Maco film in pyro at 75 
> degrees and find that the old film is soooo soft at anything higher than 68 
> degree development that the emulsion is easily melted off.  Is the new film 
> this soft?  Luckily I only snotted off one negative at the beginning of the 
> roll...
> 

I've developed the Maco IR film at temperatures above 70 deg F.  The emulsion
did not melt off.  It is definitely more prone to scratching than most "modern"
films and requires more care in handling.

--Michael
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