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How to use a non-AI lens on a Nikon FG
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How to use a non-AI lens on a Nikon FG
William Hamblen wrote:
Some Nikons for aperture priority autoexposure will read the light through the stopped-down lens, but I don't know whether the FG is one of them. The farthest open spot on the sensor ring is after the "no lens" spot, so the camera will detect that there is no lens or the lens has no meter coupling at all, and assume that the lens is stopped down to working apeture already. The FG does not have the ability to stop down the lens manually for a reading, so it will only work, if at all with the lens wide open (unless the lens itself has a stop down lever). Actually I can't remember a Nikon camera that had that feature. :-( Geoff. -- Geoffrey S. Mendelson, N3OWJ/4X1GM My high blood pressure medicine reduces my midichlorian count. :-( |
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How to use a non-AI lens on a Nikon FG
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How to use a non-AI lens on a Nikon FG
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How to use a non-AI lens on a Nikon FG
On 2012-01-16, Geoffrey S. Mendelson wrote:
William Hamblen wrote: Some Nikons for aperture priority autoexposure will read the light through the stopped-down lens, but I don't know whether the FG is one of them. The farthest open spot on the sensor ring is after the "no lens" spot, so the camera will detect that there is no lens or the lens has no meter coupling at all, and assume that the lens is stopped down to working apeture already. The FG does not have the ability to stop down the lens manually for a reading, so it will only work, if at all with the lens wide open (unless the lens itself has a stop down lever). Actually I can't remember a Nikon camera that had that feature. :-( Geoff. Your depth of field preview lever will stop down the lens. Whether the TTL meter will read the correct exposure is another question. Bud |
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How to use a non-AI lens on a Nikon FG
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How to use a non-AI lens on a Nikon FG
On 1/16/2012 6:09 PM, William Hamblen wrote:
Your depth of field preview lever will stop down the lens. Whether the TTL meter will read the correct exposure is another question. The Nikon FG does not have a depth of field preview lever. -- Mike Benveniste -- (Clarification Required) You don't have to sort of enhance reality. There is nothing stranger than truth. -- Annie Leibovitz |
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How to use a non-AI lens on a Nikon FG
On 2012-01-16 19:29:03 +0000, Geoffrey S. Mendelson said:
wrote: [...] This method does seem redundant though. Isn't the max aperture already known to the camera? Isn't that what the tab at the bottom of the lens opening does as the lens is twisted on? Actually it's a minimum aperture indicator. Was first used on the 4004, which controlled the actual aperture via the electronic contacts on an AF lens. AI was introduced in 1977 and was known as Automatic Maximum-Aperture Indexing. It signals the wide-open f-stop (maximum aperture) via the Maximum Aperture Indexing Post (near the bottom of the lens mount). It signals the position of the aperture control ring, relative to wide-open, via the meter coupling ridge. With these two pieces of information, AI-compatible cameras are able to determine the actual f-stop the user has selected on the aperture control ring. Cameras that offer P and/or S mode require that the aperture control ring is set at the fully stopped-down position - the minimum aperture. The camera is now able to determine the range of absolute f-stops offered by the lens. IIRC, these 3 features were first used together in 1982 by the FG, then 1983 FA 1985 F-301/N2000 1986 F-501/N2020 (AF) 1987 F-401/N4004 (AF) The F-401 did _not_ control the lens f-stop via the electrical contacts - I think you'll find that the only Nikkors having an electronically controlled aperture iris are the PC-E series. The FG and later cameras need to determine the actual rather than relative f-stop in order to provide Program mode TTL OTF flash. It also allowed the FA and some of the later bodies to display the f-stop chosen by P and S modes. AI-S lenses were introduced in 1981 (before the FG). These have a standardized aperture stop-down lever enabling precise control of f-stop by the camera in P and S modes. Using an AI lens may cause a significant error between wanted and actual f-stop. G lenses are not AI-S, but retain the standardized aperture stop-down lever for precise control. This "S" feature also enables the F-401 and more recent cameras to set the f-stop via a control on the body, rather than the lens aperture control ring, in M and A modes. That's the big difference between the Nikon and Canon AF lenses. After the problems with the F3AF, Nikon decided to move controls to electronic and the motors to inside the camera. The difference raised the price of the cameras, but did two things. First the lenses used rack and pinion focusing instead of a helicoid which made them 30% cheaper. The second is when faster autofocusing came out, you just bought a new camera, and kept all your lenses. Canon went the other way and put the motors in the lenses, which was a disaster for early EOS buyers. I had both, but sold off all my Canon gear after two years of waiting for lenses that were vaporware, while all they sold were cheap zooms. :-( To keep it relevant, the regular full frame AF lenses are AIS, so they will work fine on your FG, except for the G ones. Geoff. |
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