Avantra help

[Quark]

First time poster!
Hi all,
hope everything is well. The main trouble i have is that the expsoure is fine on 100% but when you get down to 5% it comes out at 3 and maybe even 2.5,would this be the curves on the laser?
thanks

[born2print]

Originally Posted by Quark

First time poster!
Hi all,
hope everything is well. The main trouble i have is that the expsoure is fine on 100% but when you get down to 5% it comes out at 3 and maybe even 2.5,would this be the curves on the laser?
thanks

Um, Interresting user name!
I would start my answer with the fact that if you're getting within 2% on a 21 step curve, you're within industry accepted standard....
We used to run all 3 of our Agfa imagesetters linear, no Xcurve was ever needed, as long as we kept the Dmax (exposure level measurement on film for maximum density) between.....
um... I think 4.8 - 5.2 Dmax.
We ran Agfa film, FYI.

[rejamesuk]

even your perfecct 100% is 4.5 - 5% off

[Quark]

Thanks for the help Guys its been a great comfort really,i was hoping it would be acceptable to have a varyence like that.Just one more quickie,the vaccumm pump,is it possible to adjust the strength yoursef? any good housekeeping tips for the avantra?
All the best

[born2print]

Originally Posted by Quark

Thanks for the help Guys its been a great comfort really,i was hoping it would be acceptable to have a varyence like that.Just one more quickie,the vaccumm pump,is it possible to adjust the strength yoursef? any good housekeeping tips for the avantra?
All the best

Tackycloth is nice for the drum, shouldn't need to adjust vaccum. Film cleaner w/ cheesecloth for the spinning mirror (I used to need to clean the Avantra 44 mirror very often to keep dmax and linearization stable)

[oxburger]

the only thing I can advise is to keep your plastic gears lubricated to keep them from wearing out. We used a really thick petroleum based oil/grease (similar to vaseline).