Re: Polymer Photogravure blarchive
Yep--31 steps are 3 steps to a stop, 21 steps are two. Chris ----- Original Message Follows ----- From: Jon Lybrook <jon@terabear.com> To: zphoto@montana.net Cc: alt-photo-process-l@usask.ca Subject: Re: Polymer Photogravure blarchive Date: Mon, 02 Apr 2007 17:28:33 -0600 >Hey Chris, > >Forgive my ignorance...do Steps in a step wedge correlate >as Stops (as in F-stops)??? > >Thamks, >Jon > > > > > >zphoto@montana.net wrote: >> I agree, Jon. Clay, I am able to get at least 7 stops. >> Chris >> >> ----- Original Message Follows ----- >> From: Jon Lybrook <jon@terabear.com> >> To: alt-photo-process-l@usask.ca >> Subject: Re: Polymer Photogravure blarchive >> Date: Mon, 02 Apr 2007 15:48:12 -0600 >> >> >>> Heh...I thought I was the only one who did stuff like >>> that. ;-) >>> >>> I'm actually able to get 31 (+ white) distinct steps >>> with the KM73 plates using a custom screen. I should >>> probably post a scan of a printed step wedge to my >>> procedure sometime to prove it to the non-believers. >>> More is likely possible, but it's tough to know when to >>> draw the line. 31 seems to get me pretty much where I >>>want to be. >>> See >>> >http://www.terrabear.com/procedures/polymer_photogravure.html >>> >>> Best wishes, >>> Jon >>> >>> >>> wcharmon@wt.net wrote: >>> >>>> Oops. I thought that was off-list. Cryptic enough? >>>> >>>> >>>> >>>>> Thanks! I think that may be all I need to at least >>>>> give it a shot. It looks like the DR of the KM73 plate >>>>> is 11 steps, or 11*.15=1.65. That sounds consistent >>>>> with what I was doing last summer in a traditional >>>>> copper gravure workshop I took with Jon Goodman. In >>>>> that workshop, we >>> aimed for interpositives with highlights at 0.5 and >>> shadows >>>>> at 2.0 for a nice complete full range etch. Do you >>>>> like having some 'tooth' in your highlights? That is >>>>> one of the advantages we are finding for this >>>>> particular >>> approach: you can easily create a curve that puts some >>> ink >>>>> and texture even in the thinner areas of the inkjet >>>>> transparency. >>>>> >>>>> >>>>>> Just came across this archive of info on someone's >>>>>> website who was studying Polymer Photogravure. It >>>>>> appears to be something of a combined blog and >>>>>> archive, hence, blarchive. Didn't really examine >>>>>> the core >>> website too much, but this doc seems to be a nice >>> >>>>>> smattering of people's experiences with the KM73 >>>>>> plates , Solarplates, etc. >>>>>> >>>>>> >>> >http://www.lillil.com/pdf%20files/lillil_polymer&photogravure.pdf >>> >>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>>> >> >> Assistant Professor of Photography >> Photography Option Coordinator >> Montana State University >> College of Arts and Architecture >> Department of Media and Theatre Arts, Room 220 >> P.O. Box 173350 >> Bozeman, MT 59717-3350 >> Tel (406) 994 6219 >> CZAphotography.com >> >> >> > Assistant Professor of Photography Photography Option Coordinator Montana State University College of Arts and Architecture Department of Media and Theatre Arts, Room 220 P.O. Box 173350 Bozeman, MT 59717-3350 Tel (406) 994 6219 CZAphotography.com |