Both my 4x5's have clear glass and Fresnel glass. What does the Fresnel glass do? I read somewhere that the Fresnel could be removed. Why would you remove the Fresnel glass?
Both my 4x5's have clear glass and Fresnel glass. What does the Fresnel glass do? I read somewhere that the Fresnel could be removed. Why would you remove the Fresnel glass?
The Fresnel 'lens' helps to distribute the light hitting the groundglass so that illumination of the ground glass is reasonable even. The Fresnel is a piece of glass, or plastic, engraved (right word?) with carefully spaced concentric rings. These rings act like a lens to bend the incoming light so that the rays are perpindular to the ground glass.
You can see the effect easily. Look at a brightly lit scene with the Fresnel in place, remove it and then look at the GG again, the difference should be readily apparent. Note: If you decide to remove the Fresnel, be sure to reinstall it in it's original position.
--P
Last edited by Preston; 2-Dec-2011 at 17:39. Reason: typo fixed
Preston-Columbia CA
"If you want nice fresh oats, you have to pay a fair price. If you can be satisfied with oats that have already been through the horse; that comes a little cheaper."
Stradibarrius,
Perhaps you missed it, but this was the subject of a very informative thread just a few days ago: http://www.largeformatphotography.in...hlight=fresnel
Arca-Swiss 8x10/4x5 | Mamiya 6x7 | Leica 35mm | Blackmagic Ultra HD Video
Sound Devices audio recorder, Schoeps & DPA mikes
Mac Studio/Eizo with Capture One, Final Cut, DaVinci Resolve, Logic
Thanks that clears it up for me.
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