kram Posted November 28, 2005 Share Posted November 28, 2005 What is the difference betwen AI and AI's lenses? Are AI the lenses with the prong coupler thingie that work on the old F camera? I am going to sell some lenses with the prong coupler and want to know if they are considered AI or AIs.Thanks for any help.:-) Link to comment Share on other sites More sharing options...
alan_olander1664878205 Posted November 28, 2005 Share Posted November 28, 2005 AI and AIS both have the "prong coupler thingie" or "ears". Non-AI lenses have them, too. Here's a link that shows the differences: http://www.nikonlinks.com/unklbil/nomenclature.htm Link to comment Share on other sites More sharing options...
ebogaerts Posted November 28, 2005 Share Posted November 28, 2005 All manual focus Nikkors, with the exception of the series e manual focus lenses, have the metal "rabbit ears" prong. That has nothing to do with a lens' AI or AIS status. Roland Vink has a website set up whereas you can check the serial number of your lens to tell which version it is (non AI, AI, and AIS). AIS lenses are very easy to tell from a visual standpoint. There is a slight "scoop" on the metal part of the lens' mount. AI lenses aren't quite as easy to differentiate from non AI lenses, particularly if they've had an AI factory ring installed on them. Go here: http://www.photosynthesis.co.nz/nikon/serialno.html Link to comment Share on other sites More sharing options...
bernard_frank Posted November 28, 2005 Share Posted November 28, 2005 What do you mean, Eric? I think AI lenses are easy to differentiate from non-AI since they have the second row of smaller aperture numbers, in addition to the diaphragm lever. Don't you think so? Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted November 28, 2005 Share Posted November 28, 2005 Many of the real old Nikon F lenses had no auto diaphram,and thus no fork. AIS lenses have an orange minimum f stop; ie like F22 in orange. Only some cameras really need the AIS versus AI feature. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted November 28, 2005 Share Posted November 28, 2005 AIS makes the diaphram ring rotation linear; the Nikon FA uses this. AIS also in some lenses brought a less robust, downsized lighter mount, ie lower cost design with less screws. The upsize is than some folks crave AIS over AI lenses; and this creats valueable deals in the AI used market. Folks pay higher for a less robust lens, with the same optics and coatings!. Some lenses have an enhanced multicoating versus a regular multicoating, good for bragging, but really a wash in most cases. The FA FG and 2XXX series and a few others use the AIS linear feature. Link to comment Share on other sites More sharing options...
ebogaerts Posted November 29, 2005 Share Posted November 29, 2005 Bernard: I have an AI 50mm f/2 in front of me, and it has the second smaller aperture scale on it. I had forgotten about the orange colored minimum aperture. In terms of the aperture lever, as far as I know all Nikkors with an auto aperture have an apeture lever. The AIS lens aperture lever movement is linear, versus the AI apeture movement which is non-linear. When I look at Nikkors on the used market, I swing the lenses to look at the mount or I want to see a picture of the lens mount - easy and quick. Roland Vink's website is a quick resource if I get a serial number. Link to comment Share on other sites More sharing options...
david_h._hartman Posted November 29, 2005 Share Posted November 29, 2005 <em>AIS makes the diaphram ring rotation linear; theNikon FA uses this. --Kelly Flanigan<br></em><br>No, it is the aperture coupling lever and the stopping down ofthe aperture that is linear. This is necessary for ShutterPreferred and Programmed modes so the camera can accurately stopdown the lens.<br><br>This feature was first used buy the FA and later by the F4. Thereis one other that used this feature in a manual focus, non-CPUlens, perhaps the N6000 or something. For those who areinterested, information on this third camera can be found atPhotography in Malaysia.<br><br>To those who wish to add a CPU to their manual focus Nikkors theAIS is more desirable if they use S and P modes. If not AIS v. AImakes no difference.<br><br><em>The upsize is than some folks crave AIS over AI lenses;and this creats valueable deals in the AI used market. Folks payhigher for a less robust lens, with the same optics and coatings!--Kelly Flanigan<br></em><br>Crave? Come now, there are important functionaldifferences between AIS and AI Nikkors over and above the linearaperture issue.<br><br>AIS Nikkors are smoother and faster focusing. I prefer AISNikkors in lenses Ill use for candid photography. Thisgenerally means 50mm and longer but I dont mind thesmoothness of my 28/2.0 AIS. The AI Nikkors have a longer throwon the focus ring so they provide longer, more useful distancescales and generally have more graduations on the DOF scale so Igenerally prefer AI Nikkors for 50mm lenses and shorter. Forexample the 24/2.8 AI. OK, so how can I prefer both AI and AISfor 50mm lenses? I guess Id rather have (as I do) a 50/1.8AI and Id rather have (as I do) a 50/1.4 AIS because of thegeneral use I have for each.<br><br>Same optics and coating? Very often the same opticsbut some AIS Nikkors have the newer Super Integrated Coatings. Iown two: a 135/2.8 AIS and 28/2.0 AIS. Ive compared the 28/2.0AIS with SIC and without. This is not the best way to judge theworth of Super IC coatings as these lenses are very flare andghost resistant. I have other less flare resident AF Nikkors withSIC so I can say that lenses with SIC have less colorful ghosts.I don't consider SIC worth replacing most of my manual focuslenses but it can't be worse then the older IC coatings. It'svery safe to say that SIC is very useful in zoom lenses. I wouldlikely prefer a 24/2.8 AIS with Super IC over my 24/2.8 AI but Ihave not had a chance to compare lenses. The 24/2.8 is quiteprone to ghosts under adverse lighting.<br><br>Good for bragging? Can you prove thats all itsgood for? Give me facts not sarcasm.<br><br>and a few others use the AIS linear feature. --KellyFlanigan<br><br>Whoa there! Actually all AF Nikkors are also AIS lenses and havethat linear feature. All AF Nikon SLR(s) and DSLR(s)that offer Shutter Preferred and Program modes (that's all ofthem isn't it?) require the linear feature for those modes.<br><br>Anyway Lust would be a better word than crave becauseI have a general lust for Nikon glass, AIS, AI, AI(ed), Pre-AI,AF-D and even G Type with certain restrictions.<br><br>Regards,<br><br>Dave Hartman.<br><br>NAS is not evil; NAS is good! (sm).<br><br>PS: Now dont say Im being mean. You need to checkyour facts. Link to comment Share on other sites More sharing options...
bernard_frank Posted November 29, 2005 Share Posted November 29, 2005 That's just what I was saying, Eric. I was responding to your (quote): " AI lenses aren't quite as easy to differentiate from non AI lenses, particularly if they've had an AI factory ring installed on them. " Maybe you meant "AI lenses ARE EASY to differentiate..." Anyway, I think this thread is very useful. Particularly David H.'s post (as usual). So many people don't know what the differences are and how to tell the versions apart. Here is a photo that might be of some help. "Rabbit ears" can be found on AI lenses (it's irrelevant), but they serve no purpose except on non-AI older bodies. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted November 29, 2005 Share Posted November 29, 2005 Dave; many of us who started with the Nikon F view the AIS as downsized lenses, with SOME ones that are cost reduced, ones that are less robust. Not many cameras really need the AIS features. Paying more for the same optics with a sometimes lighter duty mount is appalling. With the 105mm F2.5 the AIS adds a lens hood, thus the mechanics were changed. The grease was changed somewhere roughly in the AI to AIS change, I have seen radically more grease migration to the optics with AIS than AI lenses. IF a persons cameras dont need the AIS feature; why pay more for a lens? Many of the classical robust non AI lenses were redesigned with lighter mounts with less screws, plastic parts inside, cheaper greases, in the move to AI or AIS. With alot of lenses there is no change in the optics with non-AI to AI to AIS , like the 105mm F2.5 from 1971 on. The Olympus OM-1 fad of the 1970's caused alot of the major camera lines to go into a downsize, slimming down, cost reduced product line. Cars got slimmer too. BUT then too there was a radical increase in optical computing power; and some lenses were redesigned. The AIS being a linear diaphrame is from Nikons blurbs as what the AIS feature/change was for. It is meant for the lay puplic; who usually only buys a lens or two in their lifetime.<BR><BR>Marketing has to say that newer lenses are "better" to sell more lenses. Long ago some Nikkors had a steel stop down lever in the lens; then they when to aluminum for lower mass. With some of these steel versions; the arm would get little wear with a motor drive, but sometimes had resonance/bounce issues at faster frame rates. The lighter aluminum versions get a wear notch after alot of usage, but have less resonance/bounce issues of the diaphrame. <BR><BR>With samples of one tests, folks here skirt sample variation and talk alot about AIS verus AI in a lens such as the 105mm F2.5 that really has the same optics since late 1970, in the pre AI days. The result is folks pay more for a lens that has the same optics. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted November 29, 2005 Share Posted November 29, 2005 In buying Nikkors for a client for conversion to movie camera lenses; some AIS lenses are considered taboo, junk not to fool with, some are great, easier to convert since less screws are used . Some AIS lenses creep more, some are just as robust but harder to retrofit, harder to take apart due to glues instead of screws. Some only are available in AIS, like the 105mm F1.8 . All one has to do is buy some AIS and AI Nikkors; and take them all apart to learn the variants. :) With the 105mm F2.5 I have bought over 100 lenses, mostly used, some demos. One finds a variant that works well, then buys up the available ones with certain serial number blocks. Since the AIS feature is never used with a conversion, the lower price of a AI variant is nice. Lens centering and tilt are measured with an artifical star test bench and other cool stuff, the few ill lenses are sold off. Many times the ill lens is just one that has too much front element scrubbing, which increases flare. This scrubbing abuse is more of a real concern, than the change in multicoating in Nikkors. Link to comment Share on other sites More sharing options...
kelly_flanigan1 Posted November 29, 2005 Share Posted November 29, 2005 When the Nikon F came out; folks used the term "fork"; sometimes "the prong". The "rabbit ears" term is more of a 1970's or later lingo. Link to comment Share on other sites More sharing options...
ebogaerts Posted November 29, 2005 Share Posted November 29, 2005 ?AIS makes the diaphram ring rotation linear; the Nikon FA uses this.? --Kelly Flanigan "No, it is the aperture coupling lever and the stopping down of the aperture that is linear. This is necessary for Shutter Preferred and Programmed modes so the camera can accurately stop down the lens." --David Hartman Actually, the FA does *not* need AIS lenses to meter properly in Shutter Priority and Program. With AI and non AI glass, it does what has been referred to as a "stop down trick" where it checks exposure a fraction of a second before shutter release and ensures that the aperture is at the proper setting. I am personally usure whether or not the N2000, FG or FG-20 has this same sort of "trick". To Bernard: You are right. I misread your intial posting and apologize. The smaller secondary aperture scale is indeed an easy way to differentiate between non AI and AI glass. Link to comment Share on other sites More sharing options...
ebogaerts Posted November 29, 2005 Share Posted November 29, 2005 "This feature was first used buy the FA and later by the F4" --David Hartman That feature was never used by the F4. The F4 *does not* do Shutter Priority or Program Mode with anything other than a Nikkor lens with a CPU. What the FA and F4 *do* share is the mechanical maximum aperture indexing lever, so that both cameras can *matrix meter* with manual focus AIS and "true" AI lenses. But the F4 *does not* do P or S modes with any kind of manual focus lens that does not have a CPU chip on its mount. Link to comment Share on other sites More sharing options...
ebogaerts Posted November 29, 2005 Share Posted November 29, 2005 Correction: the above should read "mechanical maximum aperture sensor" not "lever". Link to comment Share on other sites More sharing options...
kram Posted November 30, 2005 Author Share Posted November 30, 2005 Will AIS lenses work on a Nikon EM? I just had someone ask me that. I always used them on FM's, FM2's, FM3's, F3HP's but I never even tried to use the meter as I always use a handheld meter. I guess the guy wants to know if he can meter with the lens plus maybe any program modes? Not familiar with the EM. Any ideas? Link to comment Share on other sites More sharing options...
douglas_green1 Posted November 30, 2005 Share Posted November 30, 2005 Yes, the Nikon EM will work perfectly with both AI and AIS lenses. Link to comment Share on other sites More sharing options...
dj_soroka Posted December 2, 2005 Share Posted December 2, 2005 Like the FA, the FG and N2000 also adjusted the shutter speed (and flash output for TTL) when in program mode or shutter priority mode (FA only) to adjust for the actual opening of the aperture versus the attempted stop down to the calculated value. Bernard: Your three photos are helpful, but the you should have an arrow pointing to the black prong coming out of the bayonet mount of the Ai 50 mm f/2 lens that is at the bottom of the page between f/2 and f/2.8. That prong indicates the maximum aperture of the lens (f/2), which informed the FA and N2000 of the maximum aperture possible. Link to comment Share on other sites More sharing options...
todd_armstrong Posted March 1, 2011 Share Posted March 1, 2011 <p>I have a Nikon 20mm f4 AI but the F22 is not blue but actually ORANGE! I guess the AI versions are not always Blue...<br />Just when we thought there was a firm system to tell between each lens...</p> Link to comment Share on other sites More sharing options...
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