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Photo Forum / Digital Photography / DSLR Cameras / April 2007Grinding the tab off a TC-14E to use with Ai lens?
Apparently it's simple to grind off a little tab on the newer TC-14E & TC-20EII as well. Has anyone done this? Any risk other than dust from grinding and making it possible to bump glass trying to mount a mismatched lens? Would I be stuck with stop-down metering? If that's the case, it would definitely make more sense to get a TC-14B which is designed for Ai compatibility. My intent is to use it on a 300mm f/2.8 Tokina. 420mm f/4 would be damn useful, even manual focus. 600mm f/4 is probably more than I can use but my TC-14E I got real cheap used so I'd try tinkering with it. http://www.naturfotograf.com/index2.html "A protruding tab insid the bayonet mount prevents the TC14E from being attached to non-AFI/AFS lenses. This tab is easily removed to make the TC14E universally applicable. Be aware that you will lose AF unless the prime lens is either AF-I or AF-S." Does that mean regular AF lenses don't AF then? Well they wouldn't anyways on this teleconverter because it doesn't mount so that's not exactly a loss <g>. > Apparently it's simple to grind off a little tab on the newer TC-14E & > TC-20EII as well. Has anyone done this? Any risk other than dust from [quoted text clipped - 16 lines] > on this teleconverter because it doesn't mount so that's not exactly a > loss <g>. Paul: As I mentioned in my reply to your post re: "what lens with a D200" yesterday, I have modified both my TC's (14E & 20E) as you mention re the tab grinding. I did it to allow stacking, not for mounting non AF-S lenses. However, they now both allow mounting the AF & AF-D lenses as well. You still have to watch compatibility with any "G" lenses however, as sometimes the rear inner diameter of those lenses is physically too small to allow the front lens of the TC to fit inside the lens -- thus, they won't mount at all -- nothing to do with the tab. I took the mounting ring of the TC's off the body of the TC to grind the tab off, thus no dust problem. In my case there are no metering changes at all as I normally only use them with the AF-S lenses. I doubt there would be any changes with the AF or AF-D lenses either as they would operate as AI-S on any modern body that can meter with a non chipped AI lens. I can't comment on the Tokina, however. Of course you would loose auto focus with all but the AF-S and AF-I (those lenses with in-lens focus motors). Nikon has never made a TC that retains auto focus with the AF or AF-D lenses (though some third party TC's do). Bob >>Apparently it's simple to grind off a little tab on the newer TC-14E & >>TC-20EII as well. Has anyone done this? Any risk other than dust from [quoted text clipped - 38 lines] > do). > Bob Indeed it does work for stacking now that the nub is ground off. I just tested the 105 macro & 70-200/2.8 294mm reporting f/5.6: <http://www.edgehill.net/1/?SC=go.php&DIR=Misc/photography/2007-04-15-tc-tests&PG =1&PIC=1> 560mm reporting f/8: <http://www.edgehill.net/1/?SC=go.php&DIR=Misc/photography/2007-04-15-tc-tests&PG =2&PIC=7> There is actually more detail in the second image. Not enough to justify the pixels but more detail for sure, even with a zoom. That's with the TC-14E mounted to the body and the exif reports 400mm instead of 560 using the numbers from the second TC-20E II which touches the lens (210 for the macro at 294). The aperture is also presumably reported wrong, so add a stop to all those for the TC-14E. The VR & AF work even though it's above f/5.6 which I thought was the limit for AF. They are both AF-S. Now the question is whether to get this Tokina 300mm f/2.8 MF for an 840mm f/8 view with both teleconverters stacked :-) <http://www.edgehill.net/1/?SC=go.php&DIR=Misc/photography/tokina-300-2.8&PG=1&PIC=3> I probably would not seriously use it on more than the 1.4x teleconverter which I expect would still look great at 420mm f/4. I already get a pretty good 280mm f/4 zoom now but the 2x is only decent looking on the macro so do I get this thing? :-) Hard to say what the price should be all scuffed up outside but perfect glass. The focus ring might have been a little gritty in it's movement, I'm not sure. It looks better than my 280 f/4. > Apparently it's simple to grind off a little tab on the newer TC-14E & TC-20EII as well. Has anyone done this? Any risk other than > dust from grinding and making it possible to bump glass trying to mount a mismatched lens? Would I be stuck with stop-down [quoted text clipped - 8 lines] > Does that mean regular AF lenses don't AF then? Well they wouldn't anyways on this teleconverter because it doesn't mount so > that's not exactly a loss <g>. Robert Brace has much more info in his post above, but I also removed the tab and would also *highly* recommend removing the bayonette ring before working on it - the metal filings could do nasty things. The ring is not hard to remove and work on (the metal is softer than you may expect, and curved-surface files work fine for shortening the tab length to normal - just work carefully so as not to bend the bayonette plate). See my entry on the TC20 near the end of www.donferrario.com/ruether/slemn.html -- David Ruether d_ruether@hotmail.com www.donferrario.com/ruether/ (note address change) >>Apparently it's simple to grind off a little tab on the newer TC-14E & TC-20EII as well. Has anyone done this? Any risk other than >>dust from grinding and making it possible to bump glass trying to mount a mismatched lens? Would I be stuck with stop-down [quoted text clipped - 13 lines] > the bayonette ring before working on it - the metal filings could > do nasty things. I taped off a work area with painter's tape covering the glass with paper sealed shut and used a carbide dremel bit. It only took a minute. > The ring is not hard to remove and work on (the > metal is softer than you may expect, and curved-surface files [quoted text clipped - 6 lines] > www.donferrario.com/ruether/ > (note address change) |
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