[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Rollei] More OT Jobo advice

Only repeating claim made by Jobo.


At 10:31 AM 5/6/2003 -0700, you wrote:

>On Monday, May 5, 2003, at 05:25  PM, David Seifert wrote:
>>  Temperature control +/- .2 degree vs. .1 degree (matters for C-41 color)
>Just a comment-- I don't know of any commonly available thermometers that 
>indicate 0.1 degree gradations.  My JOBO thermometer is calibrated in 0.2, 
>and is at least 1.0 degree off from my Paterson, Kodak, or Frigidaire 
>mercury thermometers.  So verifying the accuracy of temp control is an 
>exercise in frustration.  C-41 development time is
>commonly 3m 15sec, so rigid temp control doesn't have much meaning for 
>single processing runs.  Although, it definitely is desireable on 
>day-to-day or week-to-week turn-off/ turn-on repeatability.  I'm just a 
>little skeptical that such tight tolerance is actually achieved in these 
>machines.  And I'm also skeptical of the dire warnings about the need for 
>such tight control.  Nice to have maybe, for critical commercial work, but 
>for run of the mill amateur happiness, "no worries, mate".  I try to keep 
>within 0.5 degree, so don't try to pin that 2 or 3 degree slop on me :-)

Best Regards,

David Seifert