I considered the Calumet LED unit before I purchased the Aristo VCL4500. I like the idea of LEDs, but the ergonomics of the controller did not appeal to me. For each colour LED bank (green and blue) there is a value from 0 to 99 and you go from one value to another by increments of one (one push of a button). So if you had a mid contrast value set for a basic exposure and then wanted, say, green only for some burning, you might have to do a lot of button pressing to get the other tube to zero. The unit as described to me had no switch for "green only" and "blue only". All other 2-tube units have that.
John ============== mail1 wrote:
Calumet sells a ZoneVI VC head with LEDs. http://huws.org.uk/ Huws has really spent a lot of time with LEDs Also DE VERE is in the game. http://de-vere.com/products.htm This can get real expensive real fast.Jonathan Ayers-----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Don Sweet Sent: Wednesday, February 04, 2009 2:06 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: No More Below the Lens Polymax Filter Kits? High intensity LEDs covering the bluer parts of the specturm have been on the market for the last 10 years or more. I wonder why they cannot provide an easy substitute for enlarger lamps; they are apparently stable, with very low power consumption and virtually heat generation, and last for ages. A switchable bank of mixed frequency LEDs would seem to be a natural match for VC paper. Has his been done, or do LEDs present some fiendish design problem in this context? Don Sweet----- Original Message ----- From: "mail1" <mail1@xxxxxxxxxxxxxxxxx>To: <pure-silver@xxxxxxxxxxxxx> Sent: Thursday, February 05, 2009 10:34 AM Subject: [pure-silver] Re: No More Below the Lens Polymax Filter Kits?There are three versions of Zone VI VC heads. The first version used separate large transformers, and Variac controls for each tube. This VCheadis very bright with short exposure times producing a paper ES 1.43, Grade0to ES .60 Grade 5. (ISO 100 equals ES 1.0) I use this unit with a Metrolux Timer that adjusts for lamp output accurately. Using large transforms produces high output from the tubes. The second version used smaller transformers and electronic circuits to control output. I suspect you might have this version. This design could have issues with output and control. Generation 3 uses LED light sources unfortunately I have not had an opportunity to use this model. I also use the Aristo VCL4500. My unit has adjustments for both the green and blue lamps producing a paper ES 1.40 Grade 0 to ES.40 Grade 5. The Aristo tubes use colored glass that filters the frequency to a narrow spectrum where as the first generation of Zone VI uses internal phosphor coating only there for the frequency of light is a broader spectrum. This broad spectrum reacts differently, and appears brighter to our vision. I also use a durst 138 Condenser enlarger with Ilford filters the filters produce range from ES 1.38 to ES .37 Changing the voltage on the bulb does create subtle differences. I use a Metrolux timer with a Variac to control the voltage of the bulb. I really like the Durst although I find itsometimedifficult to produce ideal negatives for a condenser enlarger hence the reason for having the cold light systems. Low pressure mercury vapor lights have a narrow non uniform spectralenergyoutput. Photographic paper is optimized for the use of filteredincandescentlight which has a very different spectral energy distribution. This difference does show up in subtle ways. Jonathan Ayers [mail1@xxxxxxxxxxxxxxxxx] -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of john stockdale Sent: Wednesday, February 04, 2009 3:42 AM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: No More Below the Lens Polymax Filter Kits? Eric, I have a Zone VI VC head that I don't want, but I wouldn't recommend it for various reasons. I can give you details if you're interested. Regards, John ===================== Eric Nelson wrote:Thanks John I'm already on the lookout and have added aristo and zone vi to my saved searches on ebay. I'll have a chat w/Kodak tomorrow and see what the story is on the filters. Eric ------------------------------------------------------------------------ *From:* john stockdale <j.sto@xxxxxxxxxxx> *To:* pure-silver@xxxxxxxxxxxxx *Sent:* Tuesday, February 3, 2009 11:59:18 PM *Subject:* [pure-silver] Re: No More Below the Lens Polymax Filter Kits? The Aristo VCL4500 with an RH Designs Stop Clock Vario is a sweet, if expensive, solution. John Eric Nelson wrote:Man, and the list here was just touching on this subject recentlytoo. So I did my online searches and have come up empty handed from Freestyle to Adorama to B&H to ebay.Now /that's/ sad. At least the filters are still available and Ican cut them down for the holders which I still have. Ilford's filters stink as I've been using them a month or so. The contrast jumps dramatically between 1/2 grades and exposure is nowhere near similar from one filter to the next using /*their*/ frakkin' paper. Maybe I just "owe myself" a VC head and be done with it.Sigh.=============================================================================================================To unsubscribe from this list, go to www.freelists.org <//www.freelists.org> and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there. No virus found in this incoming message. Checked by AVG. Version: 7.5.552 / Virus Database: 270.10.17/1934 - Release Date: 2/4/2009 8:24 AM No virus found in this outgoing message. Checked by AVG. Version: 7.5.552 / Virus Database: 270.10.17/1934 - Release Date: 2/4/2009 8:24 AM============================================================================ =================================To unsubscribe from this list, go to www.freelists.org and logon to youraccount (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there. ============================================================================ ================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there. No virus found in this incoming message.Checked by AVG. Version: 7.5.552 / Virus Database: 270.10.17/1934 - Release Date: 2/4/20098:24 AMNo virus found in this outgoing message.Checked by AVG. Version: 7.5.552 / Virus Database: 270.10.17/1934 - Release Date: 2/4/20098:24 AM============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.
============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.
