Anyone Heard the Omega D5V-XL Enlarger?

 > I believe this is an unnecessary concern. Working at a smaller
aperture would extend the exposure to the point the percentage of
overall energy reaching the paper from the combination of up- and
down-glow would be small enough to be called insignificant.

did you consider cases when need to split a whole exposure in to five
or more splits?<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

On Sat, 16 Apr 2005 14:43:42 -0400, Lloyd Erlick <Lloyd at @the-wire. dot com> wrote:

 >apr1605 from Lloyd Erlick,
 >
 >I believe this is an unnecessary concern. Working at a smaller
 >aperture would extend the exposure to the point the percentage of
 >overall energy reaching the paper from the combination of up- and
 >down-glow would be small enough to be called insignificant.
 >
 >regards,
 >--le

  As I stated earlier I never actually ran into a problem caused by this
characteristic because I keep my times longer than 10 seconds. I usually target 15
seconds. The final effect is that the print (which is a very slow media anyway) does not
shift colors to any significant degree as far as I can tell. And I've probably printed
thousands more color prints than most.

JD - <a style='text-decoration: underline;' href="http://www.puresilver.org" target="_blank">www.puresilver.org</a><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

On 16 Apr 2005 20:28:11 -0700, "narke" <steven.TakeThisOut@lczmsoft.com> wrote:

  >> I believe this is an unnecessary concern. Working at a smaller
 >aperture would extend the exposure to the point the percentage of
 >overall energy reaching the paper from the combination of up- and
 >down-glow would be small enough to be called insignificant.
 >
 >did you consider cases when need to split a whole exposure in to five
 >or more splits?


apr1705 from Lloyd Erlick,

A five exposure cumulative exposure would most likely not be ten
seconds overall. When I do that sort of thing I do not want any one of
the five segments to be as short as ten seconds. Therefore, for any
given exposure or partial exposure, the ratio of "up- and down-glow"
to the exposure itself remains insignificantly low.

Even if it were significant, it would simply be part of the overall
exposure, and therefore it would be taken into account by the process
of doing test strips and test prints until one arrives at the
'correct' exposure.

These problems-in-advance are kind of like discussing how to tie
shoelaces. So much easier to put on the skates and see how it goes. No
doubt your ankles will wobble for a while and you'll fall on the ice,
but you'll be in a situation where your own intelligence will take
over and make corrections over time.

regards,
--le
________________________________
Lloyd Erlick Portraits, Toronto.
voice: 416-686-0326
email: portrait.TakeThisOut@heylloyd.com
net: <a style='text-decoration: underline;' href="http://www.heylloyd.com" target="_blank">www.heylloyd.com</a>
________________________________
--<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

"Ken Hart" <kwhart.RemoveThis@aec.nu> writes:

 > Assuming an enlarger without a shutter, such as the OP's Omega
 > D5V-VL, wouldn't this "up-glow" and "down-glow" (cute terminology!)
 > cause a color problem? As the lamp is coming up (or going down),
 > wouldn't it go thru various shades of yellow/red until it gets to
 > operating temp? With my Omega D2V (using a "household-style" lamp:
 > PH112? with no noticeable up/down-glow), my exposures for 11x14 on
 > Kodak Endura paper typically run 10sec +/-. If the glow lasts a
 > second or more, that's possibly 10% or more of the exposure.

More like 1%, the spectrum heads into the red/IR real fast! Your
eye can see it OK, but it makes very little difference to the exposure.
Doing many cycles for dodging etc is another matter if your
exposure is lots of short times.

--
Paul Repacholi 1 Crescent Rd.,
+61 (0 9257-1001 Kalamunda.
West Australia 6076
comp.os.vms,- The Older, Grumpier Slashdot
Raw, Cooked or Well-done, it's all half baked.
EPIC, The Architecture of the future, always has been, always will be.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

"Lloyd Erlick" <Lloyd at @the-wire. dot com> wrote in message
news:nfo461d1npc3in5933ai1sg98sd9e3rf7v@4ax.com...
 > A five exposure cumulative exposure would most likely not be ten
 > seconds overall. [...]

What Lloyd asserts is absolutely correct. Five, two-second exposures is not
the same as a single 10-second exposure. _That's_ why the prudent printer
does many test strips, including tests of the multiple-exposure areas -
exposed in multiple steps.

That said, I have no problems with my D5 and color head. Yet. But I would
much rather have a condenser setup, and to that end I'm still looking.
Finding a clean one is difficult.

Oh - to the OP - just a reminder that there is a High/Low switch on the
head. If your exposures are too long, check it out.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

TWO years ago that was a great price, now, without lenses, it sounds high.
I suspect he sold off the lenses and more shippable items on eBay and now
wants to unload what he has left.

--
darkroommike

----------
"narke" <steven.DeleteThis@lczmsoft.com> wrote in message
news:1113291494.401705.109650@l41g2000cwc.googlegroups.com...
 > yestoday, I went to see the enlarger. the seller ask about ttl $510.00
 > for the following items:
 >
 > 1, D5-XL Super Chromega Dichroic Enlarger
 > 2, CHROMEGATROL (with build-in timer of x0.1 second)
 > 3, 35mm Negative Carrier
 > 4, 120 Negative Carrier
 > 5, Lens mount, lens plates
 >
 > After check, I found it seemed work fine. And, it can mount a Rodagon
 > 50mm lens no problem. Because I have merly little experience in
 > enlarger, so I want to ask following questions:
 >
 > 1, What about the price? Is it worth?
 > 2, What else should I check before I decide to buy?
 > 3, I found after the power was turned off by the timer, the light of
 > the bulb however was not immediately extinquished, it quenched in a
 > gradual way and last about one second. Is it normal for a enlarger?
 >
 > Thanks in advance.
 >
 > -
 > narke
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

The Super Dichroic illumination SYSTEM is diffusion, the lamp shines into a
mixing box and then through a diffusion plate that illuminates the negative.

--
darkroommike

----------
"narke" <steven.RemoveThis@lczmsoft.com> wrote in message
news:1113380659.301320.295010@f14g2000cwb.googlegroups.com...
 > John wrote,
 >
<font color=green>  > > See <a style='text-decoration: underline;' href="http://www.replacementlightbulbs.com/lampELC.htm.</font" target="_blank">http://www.replacementlightbulbs.com/lampELC.htm.</font</a>>
 >
 > The two ELC lamps on the page are diffuser type lamps or condenser type
 > lamps ? I think the 'D5V-XL Super Chromega Dichroic' use diffuser type
 > lamp.
 >
  > > Again, it's not that critical if you have a long enough exposure. The
 > only time I thought it _may_ have been an issue was when printing 5X7's
 > at around 5 seconds.
 >
 > Consider the case that I would split a total 2n seconds exposure into
 > units of each of 2 seconds exposure. In the case, I am afraid the
 > gradually quench will be multipled by n times. So I want to get
 > information from D5** users, does the lamp on their gear work as this
 > gradually quench way? If so, I will be easy and go to shop. If not,
 > can anyone draw me a clue that explains the phenomena I encounted, then
 > I will decide if or not to buy.
 >
 > Thanks for your reply.
 >
 > -
 > narke
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

Middleman? That explain why he is asking so much, he needs to make his
money...keep looking.

--
darkroommike

----------
"narke" <steven.DeleteThis@lczmsoft.com> wrote in message
news:1113398590.215233.324280@z14g2000cwz.googlegroups.com...
 > J.Scheimpflug wrote,
 >
  > > No it does not. There is something wrong with the system you are
 > looking at.
 >
 > Supposing there is really a problem, however, where the problem most
 > likely come from? I believe there is no other causes except the lamp
 > itself. Is my guess right?
 >
 > Next time I want to replace the lamp and check again ( the current lamp
 > is a ELC 250W 24v), anyone know how to replace the lamp for the model?
 > the seller does not know how to because the guy is a middleman.
 >
 > -
 > narke
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

Many short exposures do equal one equivalent long one,
except when they don't.

Test your own system. You will need a digital timer,
if you are using a Gralab all bets are off.

Use variable contrast paper with a 5+ filter.
Set the aperture etc. so a 20 second exposure
yields a mid grey with no negative.

Do the the test on a single sheet of paper: cover
half and make a 20 second exposure, cover the other
half and make 20 two second ones. Develop, cut the
center strip out and butt the two halves.

My experience.

o Incandescent light bulb: The two are the same. GE
212 (? or something) enlarger bulb, my own f-stop
timer, Beseler 45, Ilford MC IV, 5+ polymax filter.

o Aristo cold-light head warmed for 1/2 hour,
original tube. As above, with a Besler digital
timer. Nowhere close.

Cold light systems with compensating timers should
have no trouble. If a compensated timer system can't
pass the test then the timer isn't doing it's job.
If there is a problem it may be: 1) the photodiode
has a different spectral response from the paper - there
should be a cyan filter over it; 2) the system uses a
CDS cell that has a long 'memory'; 3) the timer is
bust/badly designed.

Timers that compensate for a cold-light's dead
time should do better than those that don't.

Shuttered systems should also do well. Pulsed
xenon is pretty linear (or it should
be if the power supply is well designed).

I have no experience with halogen light (slide
projector bulb) systems.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
To reply, remove spaces: n o lindan at ix . netcom . com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

"Nicholas O. Lindan" <see DeleteThis @sig.com> wrote in message
news:Nwz8e.11287$44.3366@newsread1.news.atl.earthlink.net...
 > Many short exposures do equal one equivalent long one,
 > except when they don't.

Come on, Nicholas - it's a matter of physics. Perhaps we should qualify the
case: multiple short exposures, for example 2 to 5 seconds each, not two
20-second exposures.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

1,
i went to the store and replace the lamp, the up/down glow still exist,
this make me believe that's not a problem of lamp.

however, after read posts from all of you, i now believe that the
difference will be easy to compensate when doing B&W. but, for color
works, will the glow cause any color-cast problem? i ask this since i
saw in the period of glow, the light looks red.

2,
i noticed the chasis scale going up to 100cm, for a 80mm lens, what's
the maximized print size on the baseboard can i get from 35mm negs?

-
narke


-
narke
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

"narke" <steven.RemoveThis@lczmsoft.com> wrote in message
news:1113788842.153157.265810@g14g2000cwa.googlegroups.com...

My friend, the enlarger is just plain overpriced, and besides I'm wondering
if the power unit isn't bad as well. You can do very well for $500. Feel
free to keep looking.
 >> Stay informed about: Anyone Heard the Omega D5V-XL Enlarger? 

On 4/17/2005 7:10 PM jjs spake thus:

 > "narke" <steven.RemoveThis@lczmsoft.com> wrote in message
 > news:1113788842.153157.265810@g14g2000cwa.googlegroups.com...
 >
 > My friend, the enlarger is just plain overpriced, and besides I'm wondering
 > if the power unit isn't bad as well. You can do very well for $500. Feel
 > free to keep looking.

"Power unit bad"? Come, now: he was complaining about the afterglow of the
bulb after it goes off. Perhaps you know of a "power unit" that can somehow
reach into the filament and instantly quench it at power-off? The
super-metaphysical model, perhaps? The Obiwan Kenobe model?

Obviously this has nothing to do with any aspect of the enlarger.

Just for kicks, does anyone know--or care to take an educated guess at--how
significant this afterglow effect really is? I mean, what is the actual rate
of decay of the light? How long does it take to reach a point where it is no
longer contributing to the exposure?

My (completely pulled out of my ass) guess is that this "problem" is
insignificant and can safely be ignored for all but the very shortest
exposures (say, 1-2 seconds). I'll bet if you graphed the light output at
turn-off, you'd see something like a downward hyperbolic curve where the light
level quickly approaches zero.


--
"I know I will go to hell, because I pardoned Richard Nixon."

- Former President Gerald Ford to his golf partners, as related by
the late Hunter S. Thompson<!-- ~MESSAGE_AFTER~ -->
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