[pure-silver] Re: donut solution; enlarger lens problem
- From: "EJ Neilsen" <ej@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 11 May 2007 08:56:09 -0500
Shannon, Lens boards are not all created equal; some are flat, recessed, or
cone. Take the neg and place it in the carrier. Now remove the lens from the
board and with the enlarger on, raise and lower the lens so that the image
focuses on the easel. When the negative is focused try and get the lens
board to that spot with the dials and controls. If you can get it close,
you'll need to see if it is even with, below or above the stop. You may need
to get the lens into the body of the bellows area. I have all the other
email messages about your doughnut problem on my other computer and never
looked at them.
Does this older enlarger have condensers or a mixing box/diffusion?
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
Skype ejprinter
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of Bogdan Karasek
> Sent: Friday, May 11, 2007 8:15 AM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: donut solution; enlarger lens problem
>
> HI,
>
> If a glass negative carrier was being used, then wouldn't the *donut* be
> a Newtonian ring???? And isn't the solution to change the glass and
> install anti-Newtonian glass? Do both pieces of glass have to be
> anti-Newtonian or only one layer, top or bottom?
>
> Cheers,
> Bogdan
>
> Shannon Stoney wrote:
> > I solved the donut problem, but I don't think my messages about it got
> > to this list. If they did, please disregard. I was off the list for a
> > while, moving back to TN and changing addresses.
> >
> > Anyway it turned out that that glass negative carrier was the culprit. I
> > switched to another one, the 4x5 carrier, and the donut went away! So I
> > don't want to hear any more snide comments about the fifth rate plastic
> > camera I was using. ;-) I'll have you know that I bought that Holga
> > BRAND NEW!! (In fact it's about the only brand new thing I have.
> > Everything else is vintage. That's the future, folks. Soon we'll be
> > buying vintage film and vintage paper, because they won't make stuff for
> > old fogies who insist on using film and light-sensitive paper.)
> >
> > I am wondering if maybe my mistake was to put the frosted piece of glass
> > on top. It could be that it goes on the bottom. I can't remember how it
> > was when I first looked at it. I took both pieces out to clean them with
> > Windex, and possibly I put them back in wrong.
> >
> > The enlarger and all its accessories came used from a lab in Houston and
> > a lot of the stuff had been altered or modified in some way, too. Does
> > anybody know how the glass should be? Why is there one piece of frosted
> > glass and one not frosted? Also there are two pieces of plain, much
> > heavier glass with the accessories, but they don't fit into the 8x10
> > carrier: they appear to be a jerry-rigged solution to something.
> >
> > In the process of trying to get to the bottom of this problem, I ran
> > into yet another problem. I had bought a used 300mm enlarging lens from
> > a guy and had it mounted in a lensboard for this Devere 108 enlarger, so
> > I could enlarge 8x10 negatives. I got it out yesterday to see if that
> > would solve the problem, thinking the problem might be the enlarging
> > lens. But I could never get it to focus! I put the baseboard way down
> > and way up, and there was no sweet spot. I moved the head up and down:
> > no dice. I guess there could be something wrong with this lens too.
> > It's always something!! One odd thing was that as I opened and closed
> > the aperture on the lens, the image shrank and expanded. Weird.
> >
> > --shannon
> >
> >
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> >
>
> --
> ________________________________________________________________
> Bogdan Karasek
> Montréal, Québec bogdan@xxxxxxxxxxxxxxx
> Canada www.bogdanphoto.com
>
> "I photograph my reality"
> ________________________________________________________________
>
>
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