neil poulsen
1-May-2016, 14:36
I just received and have been experimenting with a Sinar, framed fresnel lens on a Norma, 4x5 camera. I've observed the following:
o The framed fresnel doesn't fasten to the Norma back. It appears to vertically rest against the ground glass. Once one presses it against the ground glass, perhaps a faint suction between the frenel and ground glass helps to keep it in place. It seems like it ought to fasten, though? :confused:
o The framed fresnel definitely brightens the image, and makes it easier to compose the image, but it's a little blurry. While one could focus using a loupe with the fresnel in place, it's much easier to focus without the fresnel.
Is any of this different using a Sinar F back? For example, do the Sinar, framed fresnel lenses fasten to a Sinar F back? (Seems like it ought to fasten?) Is the image through the fresnel lens any better on a Sinar F?
o The framed fresnel doesn't fasten to the Norma back. It appears to vertically rest against the ground glass. Once one presses it against the ground glass, perhaps a faint suction between the frenel and ground glass helps to keep it in place. It seems like it ought to fasten, though? :confused:
o The framed fresnel definitely brightens the image, and makes it easier to compose the image, but it's a little blurry. While one could focus using a loupe with the fresnel in place, it's much easier to focus without the fresnel.
Is any of this different using a Sinar F back? For example, do the Sinar, framed fresnel lenses fasten to a Sinar F back? (Seems like it ought to fasten?) Is the image through the fresnel lens any better on a Sinar F?