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Calculating Exposure Time

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Old January 11th, 2010 Jan 11, 2010 1:35:38 PM -  
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Default Calculating Exposure Time

It's easy to determine the optimum exposure time for a system even if you don't have an exposure calculator such as the Stouffer strip. Commercial exposure calculators are neutral density filters that allow specific percentages of the light to pass through so that you get a...
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Old June 17th, 2012 Jun 17, 2012 2:20:48 AM -   #30 (permalink)
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Default Re: Calculating Exposure Time

I did another image for 7 minutes and the halftones were all there but the image wouldn't go through....
 
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Old June 17th, 2012 Jun 17, 2012 5:31:05 AM -   #31 (permalink)
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Default Re: Calculating Exposure Time

What type of exposure system are you using? How far is the image from the light source? What type of emulsion? What type of films are you printing on and are you using ink jet or toner based printer? Are your images on your films opaque, meaning can you see light coming through when you hold the film unto the light?
 
Old June 17th, 2012 Jun 17, 2012 1:39:36 PM -   #32 (permalink)
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Default Re: Calculating Exposure Time

Quote:
Originally Posted by dd2
What type of exposure system are you using? How far is the image from the light source? What type of emulsion? What type of films are you printing on and are you using ink jet or toner based printer? Are your images on your films opaque, meaning can you see light coming through when you hold the film unto the light?
I'm using a unit with about 8 or 9 bulbs 15watts facing up with a glass on top the glass is about 7-8 upwards. I'm using a murakami hv emulsion not required to mix and i just started using water proof film ink jet printer well before I was doubling or tripling the image now it seems more darker with the waterproof film so I used one...
 
Old June 17th, 2012 Jun 17, 2012 2:05:59 PM -   #33 (permalink)
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Default Re: Calculating Exposure Time

Are you using standard fluorescent bulbs or black light bulbs?
 
 
Old June 17th, 2012 Jun 17, 2012 7:41:41 PM -   #34 (permalink)
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Default Re: Calculating Exposure Time

Quote:
Originally Posted by dd2
Are you using standard fluorescent bulbs or black light bulbs?
I believe backlight bulbs
 
Old July 29th, 2012 Jul 29, 2012 4:56:54 PM -   #35 (permalink)
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Default Re: Calculating Exposure Time

Nice for us, thank you very much. This is a good forum community.
 
Old September 21st, 2012 Sep 21, 2012 7:53:42 AM -   #36 (permalink)
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Default Re: Calculating Exposure Time

Yeah thanks for this, I'm going to try it out as I can't find another solution to calculating my times.
 
Old November 5th, 2012 Nov 5, 2012 8:04:30 PM -   #37 (permalink)
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Default Re: Calculating Exposure Time

great information i am about to try this now. only question is how do you decide which one is the exposure time. for example 5,6,7 look pretty close which would would i use????
 
Old August 15th, 2013 Aug 15, 2013 2:33:48 AM -   #38 (permalink)
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Default Re: Calculating Exposure Time

If your positive is good you should have the exposure latitude to go for the longer exposure, if it's a bit iffy, laser printer type etc. you have less wriggle room.
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Old August 31st, 2015 Aug 31, 2015 9:04:14 PM -   #39 (permalink)
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Default Re: Calculating Exposure Time

This was my first attempt at coating a screen using ULANO QTX photopolymer emulsion.
- i didnt even degrease the screen but washed it THOROUGHLY!!!
(once again this was my test screen, so without degreaser was OK)

anyways, i had a ghetto foam (black sweater) under the screen and didnt even use a glass
(since i was only there for 3 minutes i figured id hold it down as best as possible.

now i marked my screen to 30 seconds, 45 sec., 1 min., 1min 15 sec..etc to 2minutes.
(PHOTOPOLYMER emulsion i read was fast acting and not recommended for SUN. Oh well, its all I had from a friend)

now i read its fast acting with the light process,

My results were pretty good.
the 30 seconds left out some stuff
compared to the 2minute mark.
the 2minute mark alot of the emulsion pretty much almost fell right out, leaving a beautiful exposed screen.
the 1min and 30 second to 30 second part..is pretty much "OK" but nahh,
the 2min and 15 second mark is where i want to be.

once again, using ulano qtx photopolymer emulsion.
at 4pm...the sun wasnt too crazy..which was why i was shocked at the good results..

thanks for this post.
 






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