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Julio916 October 20th, 2012 07:00 PM

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?...

sben763 October 20th, 2012 07:39 PM

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.

Julio916 October 20th, 2012 07:52 PM

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...

sben763 October 20th, 2012 08:00 PM

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.

Julio916 October 20th, 2012 08:06 PM

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..

Julio916 October 20th, 2012 08:10 PM

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?

sben763 October 20th, 2012 08:23 PM

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.

Julio916 October 20th, 2012 08:47 PM

Re: exposure unit lighting info
 
ok good, wasnt sure about that,my lights would be about 3-4" away from the screen...

Julio916 October 21st, 2012 08:35 AM

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..

sben763 October 21st, 2012 09:07 AM

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

Julio916 October 21st, 2012 09:16 AM

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..

sben763 October 21st, 2012 09:19 AM

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.

Julio916 October 21st, 2012 09:22 AM

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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