Russ-Suzanne Posted January 17, 2022 Share Posted January 17, 2022 Hello When I screw an older AI lens onto my D70 and D780, will the camera automatically default to center-weighted metering? No more matrix metering? Thank you Russ Thank you Russ 1 Link to comment Share on other sites More sharing options...
Sanford Posted January 17, 2022 Share Posted January 17, 2022 I don't know about the metering but the old Nikkor looks good on that Nikon. Link to comment Share on other sites More sharing options...
dennisbrown Posted January 17, 2022 Share Posted January 17, 2022 According to Ken Rockwell, yes. Nikon D780 Review Link to comment Share on other sites More sharing options...
hapien Posted January 17, 2022 Share Posted January 17, 2022 (edited) Most likely You want to enter focal lenght and maximum aperture to MENU > SETUP > Non-CPU Lens Data and matrix metering is supported. The camera remembers last non cpu one that has been entered as remounted. Edited January 17, 2022 by hapien 1 Link to comment Share on other sites More sharing options...
Bill Snell Posted January 17, 2022 Share Posted January 17, 2022 Hi Russ, Are you sure that is an ai lens - looks like a pre ai to me so mounting it could cause damage to the camera. I have an old D700 and several non ai lenses and wouldn't even try. (Plenty on Google) - Bill. 4 Link to comment Share on other sites More sharing options...
mike_halliwell Posted January 17, 2022 Share Posted January 17, 2022 Just what is that lens? Link to comment Share on other sites More sharing options...
Bill Snell Posted January 18, 2022 Share Posted January 18, 2022 Just what is that lens? Nikkor P 105mm f2.5 - I think. Link to comment Share on other sites More sharing options...
bgelfand Posted January 18, 2022 Share Posted January 18, 2022 First, be sure the lens has been AI'ed, or it stands a good chance of damaging your camera by bending the AI coupler. If the 780 is like my D750 (and I assume it is for non-CPU lenses), if you enter the focal length and maximum aperture in Non-CPU Lens Data in the Setup menu, the camera will be able to utilize Color Matrix Metering, as well as spot and center weigh metering, The D750 can store the data for up to nine differnet lenses, consult the manual for the D780. Link to comment Share on other sites More sharing options...
mike_halliwell Posted January 18, 2022 Share Posted January 18, 2022 Nikkor P 105mm f2.5 Hummm, the pic of the 105mm 2.5 P on photosynthesis has the focus scale in m (meters) next to the infinity mark, and the chrome ring. This one seems to be ft only and has a screw hole opposite the infinity mark on the focus ring. But the f2.5, scalloping and chrome make it a P.....:confused: Modded somehow? Link to comment Share on other sites More sharing options...
mike_halliwell Posted January 18, 2022 Share Posted January 18, 2022 EDIT....It's a 105mm 2.5 P non-ai (l) Link to comment Share on other sites More sharing options...
BeBu Lamar Posted January 18, 2022 Share Posted January 18, 2022 I am not sure but it certainly looks like a Pre AI lens and without modification it can damage the D780. With an AI lens you can have matrix metering and can shoot in both A and M mode once you enter the non CPU lens data. For the D70 no meter is available with AI lens and it only works in M mode. Link to comment Share on other sites More sharing options...
Sanford Posted January 18, 2022 Share Posted January 18, 2022 Well, it's mounted on the camera so obviously it didn't damage anything. Is that an AI ridge showing to the right of the fork? Link to comment Share on other sites More sharing options...
c_watson1 Posted January 18, 2022 Share Posted January 18, 2022 (edited) Well, it's mounted on the camera so obviously it didn't damage anything. Is that an AI ridge showing to the right of the fork? The lens had better be sporting a factory Ai aperture ring or have a notch appropriately Dremel-ed into the original. If not, a visit to Nikon service could be in your future if the camera's Ai follower tab is busted. Edited January 18, 2022 by c_watson|1 1 Link to comment Share on other sites More sharing options...
dennisbrown Posted January 18, 2022 Share Posted January 18, 2022 According to the Photosynthesis web site, the lens is a 10.5cm f/2.5 "P". The serial number, 136700, makes it a non-AI. Not that it may have been AI'd later. 1 Link to comment Share on other sites More sharing options...
ShunCheung Posted January 18, 2022 Share Posted January 18, 2022 That is definitely a pre-AI lens originally as the "rabbit ear" coupling fork is solid. In the late pre-AI era, Nikon started adding a rubber cover over the focusing ring. You need either a lens with a CPU or enter the lens maximum aperture into the non-CPU lens data to have matrix metering. Link to comment Share on other sites More sharing options...
mike_halliwell Posted January 18, 2022 Share Posted January 18, 2022 It seems there are a large number of variations even within the non-ai 'label' of the P type. 105mm f2.5 Nikkor-P Auto & 105mm f2.5 AI Lenses Link to comment Share on other sites More sharing options...
mike_halliwell Posted January 18, 2022 Share Posted January 18, 2022 You need either a lens with a CPU or enter the lens maximum aperture into the non-CPU lens data to have matrix metering. I'm obviously missing something obvious here....:rolleyes: If you've got long enough to MF this moderate tele lens, you've got long enough either to do a 'test' exposure, and adjust to taste or do a 5 stop bracket set. If it's for something like portraiture, the light won't change that much between individual exposures anyway. ...... or maybe use the Live Histogram in LV when you're accurately focusing the thing. It's a lens with heaps of character and i can see why you want to use it, but it's never going to be a quick lens to use, matrix metering or not. I'd personally use full Manual Exp. with auto ISO and just use exp.comp +/- to adjust to taste. I guess you already know what shutter speed and f stop you want to use for the job in hand, right? Link to comment Share on other sites More sharing options...
BeBu Lamar Posted January 18, 2022 Share Posted January 18, 2022 I'm obviously missing something obvious here....:rolleyes: If you've got long enough to MF this moderate tele lens, you've got long enough either to do a 'test' exposure, and adjust to taste or do a 5 stop bracket set. If it's for something like portraiture, the light won't change that much between individual exposures anyway. ...... or maybe use the Live Histogram in LV when you're accurately focusing the thing. It's a lens with heaps of character and i can see why you want to use it, but it's never going to be a quick lens to use, matrix metering or not. I'd personally use full Manual Exp. with auto ISO and just use exp.comp +/- to adjust to taste. I guess you already know what shutter speed and f stop you want to use for the job in hand, right? When the meter in my Df failed early 2018 and before I could have it fixed. I shot a few hundred shots with it without any meter. It worked just fine. Metering isn't important any more. 1 Link to comment Share on other sites More sharing options...
c_watson1 Posted January 18, 2022 Share Posted January 18, 2022 That is definitely a pre-AI lens originally as the "rabbit ear" coupling fork is solid. In the late pre-AI era, Nikon started adding a rubber cover over the focusing ring. You need either a lens with a CPU or enter the lens maximum aperture into the non-CPU lens data to have matrix metering. Let's assume the OP hasn't already damaged the camera's Ai follower by cramming the old 105 on the 780. Still the lens won't let the camera know its aperture without an Ai coupling. Link to comment Share on other sites More sharing options...
BeBu Lamar Posted January 18, 2022 Share Posted January 18, 2022 Let's assume the OP hasn't already damaged the camera's Ai follower by cramming the old 105 on the 780. Still the lens won't let the camera know its aperture without an Ai coupling. If it thinks the lens is AI lens it would assume minimum aperture I think. Link to comment Share on other sites More sharing options...
c_watson1 Posted January 18, 2022 Share Posted January 18, 2022 If it thinks the lens is AI lens it would assume minimum aperture I think. Cameras assume nothing. Simply put, if the OP just cranked the lens into place with no mechanical aperture linkage, the camera likely registers nothing--nada, aperture-wise. Old NAI Nikkors have to be updated to catch the AI tab to tell the body the aperture setting. Using them as you would with an adapter on a non-Nikon body isn't really on because of the potential to f-up the AI tab. Why all the confusion? Not all F-mount lenses are the same. Link to comment Share on other sites More sharing options...
BeBu Lamar Posted January 18, 2022 Share Posted January 18, 2022 Cameras assume nothing. Simply put, if the OP just cranked the lens into place with no mechanical aperture linkage, the camera likely registers nothing--nada, aperture-wise. Old NAI Nikkors have to be updated to catch the AI tab to tell the body the aperture setting. Using them as you would with an adapter on a non-Nikon body isn't really on because of the potential to f-up the AI tab. Why all the confusion? Not all F-mount lenses are the same. My mistake it would think you set at maximum aperture because the coupling is where the maximum aperture is. Link to comment Share on other sites More sharing options...
CvhKaar Posted January 19, 2022 Share Posted January 19, 2022 It would be good if the OP first would answer questions about the lens type and wether it is AI-d , or would show a full picture of the front and the back of the lens. Without this, everye answer is just speculative and not satisfying , i think .. 2 Link to comment Share on other sites More sharing options...
ShunCheung Posted January 19, 2022 Share Posted January 19, 2022 It would be good if the OP first would answer questions about the lens type and wether it is AI-d , or would show a full picture of the front and the back of the lens. Exactly, but it is up to the OP to follow up. I don't think we have responded in any way that would drive the OP away; certainly not yet. o_O Link to comment Share on other sites More sharing options...
glen_h Posted January 25, 2022 Share Posted January 25, 2022 (snip) For the D70 no meter is available with AI lens and it only works in M mode. But also no AI follower tab to worry about breaking! Earlier AI cameras have a movable tab. I think the Df does, too. -- glen Link to comment Share on other sites More sharing options...
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