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Photo Forum / Film Photography / Darkroom / October 2004Jobo LPL 7700 Contrast Settings?
Hi Folks, I am using a Jobo LPL 7700 enlarger to produce black and white prints on variable contrast paper. I am trying to find a chart that will tell me what I have to dial in to the colour wheels to produce different grades/contrast of prints on variable contrast paper? Does anyone know what these are, or does anyone know where I can download a PDF detailing them or something? Thanks, Andrew McCall > Hi Folks, > [quoted text clipped - 7 lines] > Does anyone know what these are, or does anyone know where I can > download a PDF detailing them or something? It depends on the paper you're using. The paper makers usually give a guide in thier documents. For single filter use more magenta equals more contrast. More yellow equals less. Nick >>Hi Folks, >> [quoted text clipped - 13 lines] > > Nick More complicated than that, there are apparently at least two different color filtration scales; you need to be sure while scale your filters use and get a chart that matches (it should be easy; IIRC, one scale runs 0-100, the other 0-140).  SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. > More complicated than that, there are apparently at least two different > color filtration scales; you need to be sure while scale your filters > use and get a chart that matches (it should be easy; IIRC, one scale > runs 0-100, the other 0-140). At least three I think. The Kodak [Omega,Beseler,Devere etc] the Durst [Durst and some other European ones] and I think a third one. The problem isn't the numbers but thy actually mean different things. Of course I don't remember what at the moment. OTOH more yellow will always give softer. More magenta harder. That's why you can just get a green and a blue filter for spilt filtering. Nick > I am using a Jobo LPL 7700 enlarger to produce black and white prints on > variable contrast paper........ > Does anyone know what these are, or does anyone know where I can > download a PDF detailing them or something? There is a few settings for various enlargers on this pdf: http://www.ilford.com/html/us_english/pdf/Cont.pdf Linked from this page,which has mucho info: http://www.ilford.com/html/us_english/bw.html Jobo enlargers are recommended to use the settings the same as kodak according to that.Have a read and it'll give you a few clues. Alan. SignatureTo reply by e-mail, change the ' + ' to 'plus'. http://www.dvatc.co.uk - Off-road cycling in the North Midlands. > > I am using a Jobo LPL 7700 enlarger to produce black and white prints on > > variable contrast paper........ [quoted text clipped - 7 lines] > according to that.Have a read and it'll give you a few clues. > Alan. Thanks for this information - this was exactly what I was looking for! Am I correct in reading that for Ilford paper, Ilford recommed that the following settings be used with my Jobo/LPL enlarger: Multigrade Settings ========== ========= 00 162Y/0M 0 90Y/0M 1/2 78Y/5M 1 68Y/10M 1 1/2 49Y/23M 2 41Y/32M 2 1/2 32Y/42M 3 23Y/56M 3 1/2 15Y/75M 4 6Y/102M 4 1/2 0Y/150M 5 0Y/0M Thanks, Andrew McCall > "A.Lee" <alan@darkroom.+.com> wrote in message news:... >> >> > I am using a Jobo LPL 7700 enlarger to produce black and white prints on >> > variable contrast paper........ >> There is a few settings for various enlargers on this pdf: >> http://www.ilford.com/html/us_english/pdf/Cont.pdf > Am I correct in reading that for Ilford paper, Ilford recommed that > the following settings be used with my Jobo/LPL enlarger: That seems about right according to the pdf.There is another table before that with valuse for just the use of magenta or yellow, but it says that exposure times are more consistent between grades if you use a mixture of M and Y. Obviously you'll have to test it out as these are the optimum settings, and you enlarger may be slightly out - the voltage may be higher/lower, or the bulb may be getting old (they go yellow as they age). Alan. SignatureTo reply by e-mail, change the ' + ' to 'plus'. http://www.dvatc.co.uk - Off-road cycling in the North Midlands. > Am I correct in reading that for Ilford paper, Ilford recommed that > the following settings be used with my Jobo/LPL enlarger: [quoted text clipped - 14 lines] > 4 1/2 0Y/150M > 5 0Y/0M Seems something wrong in the last line; for Grade 5, I wouldn't expect removal of all magenta filter; rather, I'd expect it to be set near its maximum, similar to the yellow setting for grade 00. Or perhaps they're saying that enlarger doesn't have enough magenta density available to get to Grade 5... SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. > Hi Folks, > > I am using a Jobo LPL 7700 enlarger to produce black and white prints on > variable contrast paper. Bad idea. Stop doing that this instant! Use a condenser machine for B&W. > I am trying to find a chart that will tell me what I have to dial in to > the colour wheels to produce different grades/contrast of prints on [quoted text clipped - 6 lines] > > Andrew McCall > > Hi Folks, > > > > I am using a Jobo LPL 7700 enlarger to produce black and white prints on > > variable contrast paper. > > Bad idea. Stop doing that this instant! Use a condenser machine for B&W. I would love to use the correct equipment all the time - but at the moment a Jobo/LPL 7700 is all I have! What sort of condenser machine would you recommend? Thanks, Andrew McCall > I would love to use the correct equipment all the time - but at the > moment a Jobo/LPL 7700 is all I have! > > What sort of condenser machine would you recommend? Andrew, he's a troll. Don't listen to him, and don't respond to him -- we're hoping he'll eventually starve. There's no good reason not to use your LPL -- while it might not be the best enlarger on the market, it has the advantage that you already have it and don't have a lay out more money to get it, and if you have a color head, it should do anything you want to do with an enlarger that doesn't involve tiny negatives (those work best with condensers or even point-source light, because they require so much enlargement as to emphasize light scattering from a diffused light source, including color heads). SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. > > I would love to use the correct equipment all the time - but at the > > moment a Jobo/LPL 7700 is all I have! [quoted text clipped - 12 lines] > emphasize light scattering from a diffused light source, including color > heads). Hay Donald Just curious, what do you mean by tiny? 35mm; <35mm; <APS (I think it's called APS); <instamatic; something else? I once worked w/ an old fart that called 4x5 "minature". Now I'm an old fart. Thanks, John >>There's no good reason not to use your LPL -- while it might not be the >>best enlarger on the market, it has the advantage that you already have [quoted text clipped - 11 lines] > old fart. > Thanks, John I was referring to 35 mm half frame and smaller, where the combination of small negative area and required large magnification lead to long exposures; anything that increases the light level at the negative (as a condenser does, when focused for the small mask) helps shorten exposures. I think about those things because I have a couple Minolta 16 cameras; the negative is a bit less than 1/4 of the 35 mm frame (actually, the last couple models used a larger mask and were exactly 1/4 frame, 12x18 mm). SignatureThe challenge to the photographer is to command the medium, to use whatever current equipment and technology furthers his creative objectives, without sacrificing the ability to make his own decisions. -- Ansel Adams Donald Qualls, aka The Silent Observer http://silent1.home.netcom.com Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. > > > Hi Folks, > > > [quoted text clipped - 7 lines] > > What sort of condenser machine would you recommend? Any. Just get the condenser head for this enlarger. > Thanks, > > Andrew McCall |
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