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#11
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Mamiya TLR lens hood / filter suggestions - avoiding vignetting
Paul Friday wrote:
I have a spreadsheet (or the formula) for calculating the dimensions for making your own hood out of black paper, if it is useful. Put in the diameter of the lens, the angle of view and the depth of the hood and it gives you the dimensions to draw with a pair of compasses. Cut out the arc of paper, roll and join the edges and you have a lens hood. For the geometrically inclined, it provides the dimensions of a frustrum or truncated cone. Is it as simple as a truncated cone with a minor diameter (if that is the term) the same diameter than the front lens element? Intuatively I would thought it would be more complicated that that. No reason, it is just that some of these simple things can get complicated, but, on reflection it makes sense. Pete -- http://www.petezilla.co.uk |
#12
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Mamiya TLR lens hood / filter suggestions - avoiding vignetting
Here's a website with a series of do-it-yourself leshoods as
pdf files. Just cut and glue. http://www.lenshoods.co.uk/ darkroommike Paul Friday wrote: In message , darkroommike writes I have 65, 80, 135 and 180 and use the 80 and 135 a lot. I have step up (down?) rings to use my 52mm Nikon filters on all my lenses and use a rubber lens hood on the taking lens. I have a spreadsheet (or the formula) for calculating the dimensions for making your own hood out of black paper, if it is useful. Put in the diameter of the lens, the angle of view and the depth of the hood and it gives you the dimensions to draw with a pair of compasses. Cut out the arc of paper, roll and join the edges and you have a lens hood. For the geometrically inclined, it provides the dimensions of a frustrum or truncated cone. |
#13
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Mamiya TLR lens hood / filter suggestions - avoiding vignetting
I've not felt the need to stack but then I shoot more MF in
the studio than outdoors. Since I am using 52mm filters it probably would not be an issue and the original Nikon 52mm polarizer has an oversize hood in two parts (HN-12). darkroommike Peter Chant wrote: darkroommike wrote: I have 65, 80, 135 and 180 and use the 80 and 135 a lot. I have step up (down?) rings to use my 52mm Nikon filters on all my lenses and use a rubber lens hood on the taking lens. Usefull know. Suspect from the www that the 65 is particularly trick wrt vignetting. Do you manage to stack filters? I'm thinking of maybe an orange and a polariser. If I shot more landscape and less in the studio a hood that shields both viewing and taking lenses would be required. Hmm, I've seen a picture of a hood that covers both lenses, its the size of the camera! Pete |
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