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#11
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have i managed to buy a camera with two faulty lenses
David Nebenzahl wrote:
snip The AV-1 works as has been described for other cameras of this vintage: if you operate the f-top ring, the lens does *not* stop down. And it seems as if your lenses are working normally as well. I just checked my Canon FD lens (50mm), and when removed from the camera, the aperture seems to sit about halfway closed, not fully open. Of course, with the lens mounted on the camera, it should be fully open when viewing through it. What happens when you mount the lens on the camera? I just checked out a lens mounted on an old Canon AE-1 and, ta da, all you do is slide the stop down "thing", and then you can check if the iris operates at various f stops. Hopefully, the iris "leaves" or whatever they're called aren't sticking because the lenses were exposed to extreme heat that might cause the internal lens lubricant to get sticky. This happened with a Canon FD 135mm lens many years ago. I could see the lubricant on the leaves, but removing the lens from the camera and hitting the lens on the palm of my other hand would loosen the leaves. You may not have a big problem. FWIW Dick |
#12
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have i managed to buy a camera with two faulty lenses
"sean-sheehan" wrote in message ... have i managed to buy a camera with two faulty lenses or am i havin a blonde day i have an old canon and i was trying to see if my apperture was work on both 28 + 50 mm lenses and when i run through all the f stops the iris dosent move. is this just me being stupid do they only move when attached to the camera, hope someone can shed some light on this thanks, sean In most cameras, the iris is held open fully until just before the shutter trips, so you continue to get the brightest image possible through your viewfinder until the last possible moment. Then, just before the shutter trips, exposing the film to the image, the iris is stopped down to the pre-determined, "best exposure" aperture. |
#13
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have i managed to buy a camera with two faulty lenses
"sean-sheehan" wrote in message ... snip hey thanks yeah its too old for that its a canon av-1 with a canon fd 50mm lens and a canon 28mm lens i can see the iris and its not at maximum maybe around the 11 f-stop size on both lenses and as i spin the apperture round nothing happens on either just thought this was not right The Canon brand FD lenses came in two varieties: the earliest had a breechlock ring that turned to mount the lens. The later variety did not have a separate ring- the whole lens turned to rotate. In some early lenses, the pin sticking out the back of the lens at the bottom can be moved to one side and the aperature would stop down. In other (and later) lenses, the lens has to be mounted (or 'faked' into thinking it is mounted) to allow the stop-down pin to be active. Perhaps the best bet would be to mount the lens(es) on the camera, stop it down, set the shutter to a slow speed and fire the camera so that you can see the aperature stop down when looking at the front of the lens. It may be difficult with the 28mm as the sperature may be small to begin with. Does the camera have a stop-down or depth of field preview button/lever? This will answer your question. |
#14
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have i managed to buy a camera with two faulty lenses
On Thu, 02 Sep 2010 10:50:02 -0700, David Nebenzahl
wrote: Not true. Most (almost all?) non-electronic, mostly-mechanical cameras (35mm SLRs) use "wide-open" viewing, so the aperture doesn't close until the shutter is released. I was thinking of my Pentax 67 lenses, which have a separate preview lever built into the lens. |
#15
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have i managed to buy a camera with two faulty lenses
On Fri, 03 Sep 2010 03:04:15 -0400, rwalker
wrote: On Thu, 02 Sep 2010 10:50:02 -0700, David Nebenzahl wrote: Not true. Most (almost all?) non-electronic, mostly-mechanical cameras (35mm SLRs) use "wide-open" viewing, so the aperture doesn't close until the shutter is released. I was thinking of my Pentax 67 lenses, which have a separate preview lever built into the lens. Just checked the lenses for my old Nikon FG 20. On them, the iris opens and closes as youi adjust the F-stop without being attached to the camera. |
#16
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have i managed to buy a camera with two faulty lenses
On Thu, 2 Sep 2010 16:33:35 -0700, "Bill Graham" wrote:
: : "sean-sheehan" wrote in message : ... : : have i managed to buy a camera with two faulty lenses or am i havin a : blonde day i have an old canon and i was trying to see if my apperture : was work on both 28 + 50 mm lenses and when i run through all the f : stops the iris dosent move. is this just me being stupid do they only : move when attached to the camera, hope someone can shed some light on : this thanks, sean : : In most cameras, the iris is held open fully until just before the shutter : trips, so you continue to get the brightest image possible through your : viewfinder until the last possible moment. Then, just before the shutter : trips, exposing the film to the image, the iris is stopped down to the : pre-determined, "best exposure" aperture. Back in the early days of SLRs, there was a line of lenses (can't recall who made them) with a spring-loaded mechanical iris preset. The lens had a cocking lever and a cable release fitting. You cocked the iris open to frame the picture, then used a cable release to let it return to its preset position before firing the shutter. I remember seeing a picture of a cable release with two buttons and two cables: one for the iris and one for the shutter. You just had to remember which button to push first. Bob |
#17
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Quote:
http://en.wikipedia.org/wiki/Minolta_SR-T_101 I suggest you fit the lens to the empty camera and test fire on B setting or any slow shutter speed and observe the diaphragm closing according to each aperture chosen. |
#18
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have i managed to buy a camera with two faulty lenses
sean-sheehan wrote:
David Nebenzahl;889219 Wrote: On 9/2/2010 11:02 AM dickr2 spake thus: - David Nebenzahl wrote: snip- Most (almost all?) non-electronic, mostly-mechanical cameras (35mm SLRs) use "wide-open" viewing, so the aperture doesn't close until the shutter is released. Typical of this type of camera is my Minolta SRT-101, which can be used without a battery (only powers the meter, which the camera will work without). Twisting the aperture ring does nothing to stop down the iris, unless the depth-of-field preview button is pushed.- Yup, my old Canon FTb (same vintage as your SRT-101) works the same way. We need more info from the OP!- Well, since almost all 35mm SLRs of that vintage work exactly the same way, it's likely his (her?) camera works perfectly well. But yes, it would help to know what camera we're dealing with here. -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com) thanks everyone its a canon av-1 with standard fd canon lenses AE-1? |
#19
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have i managed to buy a camera with two faulty lenses
On 2010-09-20 09:51:28 +0100, Bruce said:
Paul Furman wrote: sean-sheehan wrote: thanks everyone its a canon av-1 with standard fd canon lenses AE-1? The AV-1 was a cheaper version of the AE-1 with aperture-priority automatic exposure (AE) rather than the AE-1's shutter priority AE. As with the AE-1, body construction was plastic panels over a metal subframe. Unlike to AE-1, the AV-1 had no manual exposure mode. I remember them well. I wanted the A-1 my friend had, but I never managed to afford one at the time. -- Pete |
#20
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have i managed to buy a camera with two faulty lenses
Pete wrote:
On 2010-09-20 09:51:28 +0100, Bruce said: Paul Furman wrote: sean-sheehan wrote: thanks everyone its a canon av-1 with standard fd canon lenses AE-1? The AV-1 was a cheaper version of the AE-1 with aperture-priority automatic exposure (AE) rather than the AE-1's shutter priority AE. As with the AE-1, body construction was plastic panels over a metal subframe. Unlike to AE-1, the AV-1 had no manual exposure mode. I remember them well. I wanted the A-1 my friend had, but I never managed to afford one at the time. Canon A-1s, I have 2 of them that I use all the time, mainly because I have a nice selection of Canon FD lenses. Dick the Canon FD junkie |
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