«

This stuff is sweeeeeeeeeet.

Ok I have a potentially stupid question so be forewarned...

I am going to do some painting of emulsion on canvas and mask off some
parts of it and then expose it. My question has to do with exposing
without an enlarger. I sold all my enlargers a few years back but I
do happen to have a nice old Kodak Slide projector.

So what i'm thinking is....Use the slide projector to expose the
emulsion (or even regular rc paper as a test). The slides are scala
200x and others. This is strictly experimental so there are no output
"requirements".

That'll work, right? I'd just have to get my exposure timing down due
to the immense strength of the projector bulb...eh?





Cheers,
-sd
http://www.zoom.sh

On 10/10/2003 10:20 AM Some Dude spake thus:

> This stuff is sweeeeeeeeeet.
>
> Ok I have a potentially stupid question so be forewarned...
>
> I am going to do some painting of emulsion on canvas and mask off some
> parts of it and then expose it. My question has to do with exposing
> without an enlarger. I sold all my enlargers a few years back but I
> do happen to have a nice old Kodak Slide projector.
>
> So what i'm thinking is....Use the slide projector to expose the
> emulsion (or even regular rc paper as a test). The slides are scala
> 200x and others. This is strictly experimental so there are no output
> "requirements".
>
> That'll work, right? I'd just have to get my exposure timing down due
> to the immense strength of the projector bulb...eh?

You could rig up an aperture on the slide projector lens to reduce the light
(and also increase your depth of field). All you'd need would be an opaque
disk with a hole in the center.

I wouldn't know where on the lens to put this, though: on front? behind?
Someone else here more knowledgable about optics could surely tell you that.

Or maybe you could substitute a dimmer bulb in the projector.


--
Call the American Teleservices Association at (317) 816-9336
and let them know just how much you appreciate their "services".
Telephone # courtesy of Dave Barry (yes, that Dave Barry).
(Read all about it on Slashdot:
http://slashdot.org/articles/03/10/0...tid=186&tid=99)

Yeah I was thinking the dimmer bulb thing was a good idea. Or a dying
one or something.. The good thing about this projector (well,
maybe all projectors have this) is that it has different brightness
settings for the bulb.

I was also thinking of using (borrowing) one of those display
projectors (for computers)- those things allow you to change all sorts
of settings..luminance/brightness/contrast. And because you're
projecting a computer image you can do neat things like project
mirrored images/negative/etc



On Fri, 10 Oct 2003 11:18:05 -0700, David Nebenzahl
<(E-Mail Removed)> wrote:

>On 10/10/2003 10:20 AM Some Dude spake thus:
>
>> This stuff is sweeeeeeeeeet.
>>
>> Ok I have a potentially stupid question so be forewarned...
>>
>> I am going to do some painting of emulsion on canvas and mask off some
>> parts of it and then expose it. My question has to do with exposing
>> without an enlarger. I sold all my enlargers a few years back but I
>> do happen to have a nice old Kodak Slide projector.
>>
>> So what i'm thinking is....Use the slide projector to expose the
>> emulsion (or even regular rc paper as a test). The slides are scala
>> 200x and others. This is strictly experimental so there are no output
>> "requirements".
>>
>> That'll work, right? I'd just have to get my exposure timing down due
>> to the immense strength of the projector bulb...eh?
>
>You could rig up an aperture on the slide projector lens to reduce the light
>(and also increase your depth of field). All you'd need would be an opaque
>disk with a hole in the center.
>
>I wouldn't know where on the lens to put this, though: on front? behind?
>Someone else here more knowledgable about optics could surely tell you that.
>
>Or maybe you could substitute a dimmer bulb in the projector.

Cheers,
-sd
http://www.zoom.sh

On Fri, 10 Oct 2003 14:21:44 -0400, Some Dude <(E-Mail Removed)> wrote:

>Yeah I was thinking the dimmer bulb thing was a good idea. Or a dying
>one or something.. The good thing about this projector (well,
>maybe all projectors have this) is that it has different brightness
>settings for the bulb.
>
>I was also thinking of using (borrowing) one of those display
>projectors (for computers)- those things allow you to change all sorts
>of settings..luminance/brightness/contrast. And because you're
>projecting a computer image you can do neat things like project
>mirrored images/negative/etc
>
>
>
>On Fri, 10 Oct 2003 11:18:05 -0700, David Nebenzahl
><(E-Mail Removed)> wrote:
>
>>On 10/10/2003 10:20 AM Some Dude spake thus:
>>
>>> This stuff is sweeeeeeeeeet.
>>>
>>> Ok I have a potentially stupid question so be forewarned...
>>>
>>> I am going to do some painting of emulsion on canvas and mask off some
>>> parts of it and then expose it. My question has to do with exposing
>>> without an enlarger. I sold all my enlargers a few years back but I
>>> do happen to have a nice old Kodak Slide projector.
>>>
>>> So what i'm thinking is....Use the slide projector to expose the
>>> emulsion (or even regular rc paper as a test). The slides are scala
>>> 200x and others. This is strictly experimental so there are no output
>>> "requirements".
>>>
>>> That'll work, right? I'd just have to get my exposure timing down due
>>> to the immense strength of the projector bulb...eh?
>>
>>You could rig up an aperture on the slide projector lens to reduce the light
>>(and also increase your depth of field). All you'd need would be an opaque
>>disk with a hole in the center.
>>
>>I wouldn't know where on the lens to put this, though: on front? behind?
>>Someone else here more knowledgable about optics could surely tell you that.
>>
>>Or maybe you could substitute a dimmer bulb in the projector.

Whatever you do, I love your enthusiasm for an adventure.

I know I missed your postings of late. The recent past has been the
Scarpitti volleyball on the beach fest. Welcome back.



>
>Cheers,
>-sd
>http://www.zoom.sh

Robert Vervoordt, MFA

"David Nebenzahl" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On 10/10/2003 10:20 AM Some Dude spake thus:
>
> > This stuff is sweeeeeeeeeet.
> >
> > Ok I have a potentially stupid question so be forewarned...
> >
> > I am going to do some painting of emulsion on canvas and mask off some
> > parts of it and then expose it. My question has to do with exposing
> > without an enlarger. I sold all my enlargers a few years back but I
> > do happen to have a nice old Kodak Slide projector.
> >
> > So what i'm thinking is....Use the slide projector to expose the
> > emulsion (or even regular rc paper as a test). The slides are scala
> > 200x and others. This is strictly experimental so there are no output
> > "requirements".
> >
> > That'll work, right? I'd just have to get my exposure timing down due
> > to the immense strength of the projector bulb...eh?
>
> You could rig up an aperture on the slide projector lens to reduce the
light
> (and also increase your depth of field). All you'd need would be an opaque
> disk with a hole in the center.
>
> I wouldn't know where on the lens to put this, though: on front? behind?
> Someone else here more knowledgable about optics could surely tell you
that.

IIRC, that would be called a "Waterhouse stop" ? (useless trivia not really
important to the issue at hand)

My concern with this project would be (a) if the enlarger focuses at the
distance/size you want to use; and (b) keeping everything lined up square
away, perpendicular, plumb, and parallel. Experimenting would answer all
this.

Ken

> From: Robert Vervoordt <(E-Mail Removed)>
> Organization: PenTeleData http://www.ptd.net
> Reply-To: (E-Mail Removed)
> Newsgroups: rec.photo.darkroom
> Date: Fri, 10 Oct 2003 21:38:17 GMT
> Subject: Re: Ahh, liquid emulsion. And some other questions.
>
> On Fri, 10 Oct 2003 14:21:44 -0400, Some Dude <(E-Mail Removed)> wrote:
>
>> Yeah I was thinking the dimmer bulb thing was a good idea. Or a dying
>> one or something.. The good thing about this projector (well,
>> maybe all projectors have this) is that it has different brightness
>> settings for the bulb.
>>
>> I was also thinking of using (borrowing) one of those display
>> projectors (for computers)- those things allow you to change all sorts
>> of settings..luminance/brightness/contrast. And because you're
>> projecting a computer image you can do neat things like project
>> mirrored images/negative/etc
>>
>>
>>
>> On Fri, 10 Oct 2003 11:18:05 -0700, David Nebenzahl
>> <(E-Mail Removed)> wrote:
>>
>>> On 10/10/2003 10:20 AM Some Dude spake thus:
>>>
>>>> This stuff is sweeeeeeeeeet.
>>>>
>>>> Ok I have a potentially stupid question so be forewarned...
>>>>
>>>> I am going to do some painting of emulsion on canvas and mask off some
>>>> parts of it and then expose it. My question has to do with exposing
>>>> without an enlarger. I sold all my enlargers a few years back but I
>>>> do happen to have a nice old Kodak Slide projector.
>>>>
>>>> So what i'm thinking is....Use the slide projector to expose the
>>>> emulsion (or even regular rc paper as a test). The slides are scala
>>>> 200x and others. This is strictly experimental so there are no output
>>>> "requirements".
>>>>
>>>> That'll work, right? I'd just have to get my exposure timing down due
>>>> to the immense strength of the projector bulb...eh?
>>>
>>> You could rig up an aperture on the slide projector lens to reduce the light
>>> (and also increase your depth of field). All you'd need would be an opaque
>>> disk with a hole in the center.
>>>
>>> I wouldn't know where on the lens to put this, though: on front? behind?
>>> Someone else here more knowledgable about optics could surely tell you that.
>>>
>>> Or maybe you could substitute a dimmer bulb in the projector.
>
> Whatever you do, I love your enthusiasm for an adventure.
>
> I know I missed your postings of late. The recent past has been the
> Scarpitti volleyball on the beach fest. Welcome back.

It takes two to play volleyball. If there were no other players, that troll
would go away.

"Some Dude" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> This stuff is sweeeeeeeeeet.
>
> Ok I have a potentially stupid question so be forewarned...
>
> I am going to do some painting of emulsion on canvas and mask off some
> parts of it and then expose it. My question has to do with exposing
> without an enlarger. I sold all my enlargers a few years back but I
> do happen to have a nice old Kodak Slide projector.
>
> So what i'm thinking is....Use the slide projector to expose the
> emulsion (or even regular rc paper as a test). The slides are scala
> 200x and others. This is strictly experimental so there are no output
> "requirements".
>
> That'll work, right? I'd just have to get my exposure timing down due
> to the immense strength of the projector bulb...eh?
>
>
>
>
>
> Cheers,
> -sd
> http://www.zoom.sh

Most slide projectors allow you to remove the lens easily. I wonder if
making a Waterhouse stop (just a sheet or board with a hole in it for the
aperture) and placing behind the lens would work to reduce the light level.

A regular dimmer switch might work as well. If you are planning to do this
very often perhaps buying a dimmer and mounting it in a project box along
with an electrical outlet to plug your projector in and an a/c cord to plug
the box into the wall.would be a good investment.

Sherman
http://www.dunnamphoto.com

Great responses. Thanks.

I'm going to try several different ideas today and will report back...


On Sat, 11 Oct 2003 15:16:34 GMT, "Sherman"
<(E-Mail Removed)> wrote:

>"Some Dude" <(E-Mail Removed)> wrote in message
>news:(E-Mail Removed).. .
>> This stuff is sweeeeeeeeeet.
>>
>> Ok I have a potentially stupid question so be forewarned...
>>
>> I am going to do some painting of emulsion on canvas and mask off some
>> parts of it and then expose it. My question has to do with exposing
>> without an enlarger. I sold all my enlargers a few years back but I
>> do happen to have a nice old Kodak Slide projector.
>>
>> So what i'm thinking is....Use the slide projector to expose the
>> emulsion (or even regular rc paper as a test). The slides are scala
>> 200x and others. This is strictly experimental so there are no output
>> "requirements".
>>
>> That'll work, right? I'd just have to get my exposure timing down due
>> to the immense strength of the projector bulb...eh?
>>
>>
>>
>>
>>
>> Cheers,
>> -sd
>> http://www.zoom.sh
>
>Most slide projectors allow you to remove the lens easily. I wonder if
>making a Waterhouse stop (just a sheet or board with a hole in it for the
>aperture) and placing behind the lens would work to reduce the light level.
>
>A regular dimmer switch might work as well. If you are planning to do this
>very often perhaps buying a dimmer and mounting it in a project box along
>with an electrical outlet to plug your projector in and an a/c cord to plug
>the box into the wall.would be a good investment.
>
>Sherman
>http://www.dunnamphoto.com
>
>

On 10/11/2003 8:16 AM Sherman spake thus:

> A regular dimmer switch might work as well. If you are planning to do this
> very often perhaps buying a dimmer and mounting it in a project box along
> with an electrical outlet to plug your projector in and an a/c cord to plug
> the box into the wall.would be a good investment.

Don't try using a dimmer if the projector has a fan; dimmers only work with
AC/DC-type loads, not with AC-only motors. Might not hurt anything, but it
could cause the motor to not work, leading to overheating of either bulb or
possibly the slide/film.


--
Call the American Teleservices Association at (317) 816-9336
and let them know just how much you appreciate their "services".
Telephone # courtesy of Dave Barry (yes, that Dave Barry).
(Read all about it on Slashdot:
http://slashdot.org/articles/03/10/0...tid=186&tid=99)

Good point.

I did my tests and they came out just peachy.

I took a few EIR slides and exposed them for about (about) 1/60 or
about 1/30 (who knows, I flipped the projector light off and on as
fast as I could)

I got a few very nice negative prints out of the slide.

Next test was removing the carousel and inserting a BW negative into
the chamber. Got that "mostly" aligned and did that for about the
same exposure time. Came out just fine, albeit a little bit
overdeveloped (my bad).

Next was getting a 5x7 thin, stretched canvas and mounting in front of
the rc paper. about 1/2" sec. (so the light reflected through the
canvas, dispersing it to all hell and then exposing to the paper
behind it). I also did this in front of the lens but that was no good
(no focus).



Came out....weiiiiiiiiiiiiiiiiird

The idea I had was to basically affix the rc paper onto the canvas and
then expose through it. Focusing would be a bitch otherwise (or,
impossible). Pretty cool.



So yeah- pretty successful testing day



On Sat, 11 Oct 2003 11:26:20 -0700, David Nebenzahl
<(E-Mail Removed)> wrote:

>On 10/11/2003 8:16 AM Sherman spake thus:
>
>> A regular dimmer switch might work as well. If you are planning to do this
>> very often perhaps buying a dimmer and mounting it in a project box along
>> with an electrical outlet to plug your projector in and an a/c cord to plug
>> the box into the wall.would be a good investment.
>
>Don't try using a dimmer if the projector has a fan; dimmers only work with
>AC/DC-type loads, not with AC-only motors. Might not hurt anything, but it
>could cause the motor to not work, leading to overheating of either bulb or
>possibly the slide/film.