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a20010494
Joined: 15 Feb 2010
Posts: 396
Location: Perú.
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 Posted: Thu Jul 21, 2011 3:08 pm Post subject: Canon nFD 7.5 f5.6 diafragm? |
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a20010494 wrote:
Hi, i just got this lens and it has a weird -WEIRD- diafragm. It's like it's always closed but works when i switch it from 5.6-8-11-16-22. I feel the clicks too.
Is that normal? Will my baby be ok??
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Scheimpflug
Joined: 06 Feb 2010
Posts: 1888
Location: New Zealand / USA
Expire: 2011-11-18
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| Posted: Thu Jul 21, 2011 3:56 pm Post subject: |
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Scheimpflug wrote:
Does it have a rotating set of Waterhouse stops? My 12mm fisheye is built this way.
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Sigma DP1, Nikon D40 (hers  ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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a20010494
Joined: 15 Feb 2010
Posts: 396
Location: Perú.
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| Posted: Thu Jul 21, 2011 4:03 pm Post subject: |
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a20010494 wrote:
Dunno, it's the first time i've heard of the term. I'm checking in wikipedia, but there's no such thing. It's like the diafragm is in f8 all the time.
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Scheimpflug
Joined: 06 Feb 2010
Posts: 1888
Location: New Zealand / USA
Expire: 2011-11-18
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| Posted: Thu Jul 21, 2011 4:29 pm Post subject: |
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Scheimpflug wrote:
http://en.wikipedia.org/wiki/Waterhouse_stop
Basically, it is a hole drilled in a piece of metal, or in the case of the rotating type, a series of different size holes. You can then rotate the desired hole into place. Instead of an adjustable iris diaphragm, you just pick the desired size on the wheel. When you are between sizes, the view will go black, as the light path through the lens is blocked.
_________________
Sigma DP1, Nikon D40 (hers ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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