CvhKaar Posted March 5, 2022 Share Posted March 5, 2022 Warnings in the manual for small parts and to not use if you have a pacemaker..? Link to comment Share on other sites More sharing options...
robert_bouknight1 Posted March 5, 2022 Share Posted March 5, 2022 I wonder if the warning is simply being over cautious. Probably would be OK if VR is turned off, but I don't know for sure. What guidance to pacemaker manufacturers provide? I don't have one, but my grandfather did. Link to comment Share on other sites More sharing options...
Sanford Posted March 5, 2022 Share Posted March 5, 2022 At $14,000 I can think of a few more cautions. 4 Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted March 7, 2022 Share Posted March 7, 2022 (edited) I was using an orienteering compass the other day, it had no safety advice affixed, but obviously contains a magnet, and if smashed to bits the components could easily be swallowed by a child. Luckily, I'm not fitted with a pacemaker - yet - and my child is all grown up. So I reckon I had a narrow escape there! Oooh, those foxglove flowers and rowen berries look tempting and tasty! And there's no safety sticker on them, so they must be good to eat, right? P.S. Does "other medical devices" include the hernia-belt you're likely to need from lifting heavy lenses? Edited March 7, 2022 by rodeo_joe|1 3 Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 7, 2022 Share Posted March 7, 2022 I've been kept awake at night hoping that no-one accidentally shallows the small, black 10-pin socket blanking plug....:( Or heaven forbid, the Hot-shoe cover....:eek: Link to comment Share on other sites More sharing options...
ilkka_nissila Posted March 7, 2022 Share Posted March 7, 2022 You can get those caps from Nikon. They're quite cheap. Anyway, I would take Nikon's warning seriously. Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 7, 2022 Share Posted March 7, 2022 These are the same 'lawyers' who disabled long, fast teles from being used on the Nikon Series 1 just in-case someone tried to pick up a 600mm f4 combo by only holding the J5 body...:( Seriously...? Link to comment Share on other sites More sharing options...
ShunCheung Posted March 8, 2022 Share Posted March 8, 2022 I wonder which child is going to swallow a 400mm/f2.8 lens. :rolleyes: Link to comment Share on other sites More sharing options...
bgelfand Posted March 8, 2022 Share Posted March 8, 2022 This article has more explanation about the warning: LINK Nikon's New Lens Tech is a Danger to Medical Devices | PetaPixel The Z400 uses an improved focusing system with more powerful magnets than other lenses. A problem could arise if the magnets come with six inches of a pacemaker/defibrillator according to the American Heart Association in this article (scroll down to the heading Magnets): LINK Devices that May Interfere with ICDs and Pacemakers | American Heart Association This does not mean that if you hang a camera with the lens mounted around your neck you will drop dead, but it does mean it can cause problems. If you need a pacemaker/defibrillator, you already have enough problems; you do not need anymore. No child will swallow the whole lens; the warning, found on about everything you buy, pertains to the small parts on the lens e.g., the screw on the collar mount. Link to comment Share on other sites More sharing options...
CvhKaar Posted March 8, 2022 Author Share Posted March 8, 2022 Sooo, if in an area wheren one works with iron, one needs to be carefull to keep the lens away from the iron filings and splinters, otherwise they will stick to the lens... ;) Link to comment Share on other sites More sharing options...
ilkka_nissila Posted March 8, 2022 Share Posted March 8, 2022 It's not likely to be a permanent magnet but a coil that creates a strong magnetic field when the focusing system is active. Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 8, 2022 Share Posted March 8, 2022 the screw on the collar mount. It doesn't come off, at-least none of mine do...it's a captive bolt...:) There are no small parts unless you are in the habit of leaving a disassembled 400mm 2.8 lens lying around for small people to chew on....:eek: Guess you could get a small child's head stuck in the lens hood?.....:p Or maybe being used as a club to brain a sibling?...;) 1 Link to comment Share on other sites More sharing options...
ilkka_nissila Posted March 8, 2022 Share Posted March 8, 2022 Does the lower part of the foot not come off, the screws could be small items that could be swallowed. Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 8, 2022 Share Posted March 8, 2022 Those 4 screws are very tight....! And they're so, so small, you wouldn't even notice their passing....let alone a choking hazard.....:D Maybe stuck up your nose or in your ear....? 1 Link to comment Share on other sites More sharing options...
Sanford Posted March 8, 2022 Share Posted March 8, 2022 Unless you want to arrive hours early for a close parking spot, photographing events sometimes means walking through dodgy neighborhoods with a small fortune in equipment. Link to comment Share on other sites More sharing options...
Dieter Schaefer Posted March 8, 2022 Share Posted March 8, 2022 (edited) Strange warning here: Keep the lens and speaker away from credit cards and other such magnetic storage devices. The data stored on the device could be corrupted What speaker? And I certainly will keep my credit card away from that lens - lest it be charged :p I would take the warning serious though - but wonder why there is not a warning label directly on the lens if the threar is so dire? Edited March 8, 2022 by Dieter Schaefer 1 Link to comment Share on other sites More sharing options...
CvhKaar Posted March 8, 2022 Author Share Posted March 8, 2022 And : Not locations where you would find me taking pictures i guess... Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 8, 2022 Share Posted March 8, 2022 Do not entangle, wrap or twist the straps around your neck... So, someone else's neck is fair game? ...;) Link to comment Share on other sites More sharing options...
CvhKaar Posted March 8, 2022 Author Share Posted March 8, 2022 Do not entangle, wrap or twist the straps around your neck... So, someone else's neck is fair game? ...;) yes... :cool: 1 Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted March 9, 2022 Share Posted March 9, 2022 (edited) But magnetic fields can be screened with a fairly thin plate of a material called mu-metal. This was routinely done around the beam-steering magnets in old CRT display tube devices. That would appear to be a much better solution than an easily overlooked printed warning. Or would the extra 5 bucks production cost and extra ounce or two of weight just have made that lens too heavy and expensive? Edited March 9, 2022 by rodeo_joe|1 Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 9, 2022 Share Posted March 9, 2022 mu-metal I found this on-line.... Magnetic shielding made with high-permeability alloys like mu-metal works not by blocking magnetic fields but by providing a path for the magnetic field lines around the shielded area. Thus, the best shape for shields is a closed container surrounding the shielded space. Seems the pacemaker needs shielding, not the lens! :p 1 Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted March 9, 2022 Share Posted March 9, 2022 I found this on-line.... Magnetic shielding made with high-permeability alloys like mu-metal works not by blocking magnetic fields but by providing a path for the magnetic field lines around the shielded area. Thus, the best shape for shields is a closed container surrounding the shielded space. Seems the pacemaker needs shielding, not the lens! :p Same difference! Shielding is shielding. If you're trying to stop a bullet, does it matter where, between the gun and yourself, a Kevlar vest is placed? The vest will absorb the same amount of energy regardless. Link to comment Share on other sites More sharing options...
q.g._de_bakker Posted March 9, 2022 Share Posted March 9, 2022 Same difference! Shielding is shielding. If you're trying to stop a bullet, does it matter where, between the gun and yourself, a Kevlar vest is placed? The vest will absorb the same amount of energy regardless. No, not the same difference at all. Shielding the vulnerable part is easy to do. Shielding all the many things that could do harm to the vulnerable thingy is undoable. 1 Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 9, 2022 Share Posted March 9, 2022 Humm, mu-metal doesn't seem to absorb, stop or block anything.... it seems to provide a way around something...? If you wrap a strong magnet on mu-metal does it stop being able to attract iron fillings? Link to comment Share on other sites More sharing options...
mike_halliwell Posted March 9, 2022 Share Posted March 9, 2022 Sorry typo, should be wrapped in NOT on...:oops: Link to comment Share on other sites More sharing options...
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