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exposure unit lighting info

 
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Old October 20th, 2012 Oct 20, 2012 8:00:14 PM -   #1 (permalink)
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Default exposure unit lighting info

sup guys, was wondering if anyone have info or know about exposure times, how to know how much time will it take to burn an image on a home made exposure box, with 6 daylights t8s, 32w?...
 
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Old October 20th, 2012 Oct 20, 2012 8:39:34 PM -   #2 (permalink)
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Default Re: exposure unit lighting info

This will vary greatly by emulsion type and brand. Day light bulbs take about double the time as unfiltered black lights. So if you emulsion list a starting basis for unfiltered black lights add 35%-50% time to that.
 
Old October 20th, 2012 Oct 20, 2012 8:52:41 PM -   #3 (permalink)
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Default Re: exposure unit lighting info

I have the WBP emulsion from ryonet, it says 6500k about 30secs or so and 5000k 60secs.. with my 250w halide it takes 23mins...
 
 
Old October 20th, 2012 Oct 20, 2012 9:00:28 PM -   #4 (permalink)
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Default Re: exposure unit lighting info

If the halide is not specifically for exposure it doesn't put out enough of the correct spectrum.

The WBP exposes with unfiltered blacklight at 4-5 min. So at 6" with daylight bulbs I would start at 7-9 min.
 
Old October 20th, 2012 Oct 20, 2012 9:06:04 PM -   #5 (permalink)
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Default Re: exposure unit lighting info

ok sounds good,ill try that, the halide, i had it at 12" from the screen and it will burn at 23mins,i decide to change the lighting because the heat of the light was making my transperancy useless after it was burn, too much heat.. it was also giving shadows..
 
Old October 20th, 2012 Oct 20, 2012 9:10:56 PM -   #6 (permalink)
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Default Re: exposure unit lighting info

with a exposure box,the closer your image its to the light, the less time it takes to burn on the screen or thats not how it works?
 
Old October 20th, 2012 Oct 20, 2012 9:23:55 PM -   #7 (permalink)
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Default Re: exposure unit lighting info

Florescent lights need to be at 6"or less or it will take forever to expose a screen. The weak light source needs to be close.
 
Old October 20th, 2012 Oct 20, 2012 9:47:58 PM -   #8 (permalink)
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Default Re: exposure unit lighting info

ok good, wasnt sure about that,my lights would be about 3-4" away from the screen...
 
Old October 21st, 2012 Oct 21, 2012 9:35:20 AM -   #9 (permalink)
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Default Re: exposure unit lighting info

since now the image will be closer to the light, the image will need to be the darker it can be or dont matter,before i been burning image with like a dark grey color,not sure why it wont print 100% black, image its black in corel,but when i go to print preview it looks dark grey and thats how it prints it..
 
Old October 21st, 2012 Oct 21, 2012 10:07:25 AM -   #10 (permalink)
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Default Re: exposure unit lighting info

Convert image to CMYK you more than likely have a grayscale. Then change color to 100CMYK print in photo and preium photo glossy paper and you should print plenty dark
 
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Old October 21st, 2012 Oct 21, 2012 10:16:39 AM -   #11 (permalink)
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Default Re: exposure unit lighting info

Ann ok, i don't have the settings set for premium glossy paper, only regular paper, I have a Epson 7510..
 
Old October 21st, 2012 Oct 21, 2012 10:19:13 AM -   #12 (permalink)
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Default Re: exposure unit lighting info

Yes you should. Click the arrow and you may have to scroll up or down. All epson printers have premium photo glossy as an option.
 
Old October 21st, 2012 Oct 21, 2012 10:22:57 AM -   #13 (permalink)
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Default Re: exposure unit lighting info

Yea I see it now, I just got this printer last night so it's way different from my old hp
If I have 2 layers on my image, when I print,it should print each layer or I gotta do each layer separate?
 






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