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Archive 2022 · Anyone Else Aware Of This?

DGC1
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p.1 #1 · p.1 #1 · Anyone Else Aware Of This?

From the owners manual of the new 400mm Z f2.8 TC:

Warning
Do not use this product if you have a pacemaker or use other medical devices. The magnets in this product could cause medical devices to malfunction.

I have neither a pacemaker nor this lens but is the danger real?

Feb 08, 2022 at 08:18 AM

Dbltfarmer
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p.1 #2 · p.1 #2 · Anyone Else Aware Of This?

I had a pacemaker installed this past september. (not that i wanted one). The newer pacemakers are different these days. In the days before. I got it I thought it would be a life changer as that I couldn't microwave ovens, I couldn't let my cell phone get to close to it and various other things.

Much has changed these days. I use a Microwave regularly with no problems, I use the pockets of my shirts closest to the pacemaker to hold my cell phone and haven't worried about many of the other things you couldn't do with pacemakers in the past.

I know that doesnt answer the question about the 400 lens but I doubt it is a big problem for new pacemakers.

Feb 08, 2022 at 08:23 AM

this is me
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p.1 #3 · p.1 #3 · Anyone Else Aware Of This?

Also from Nikon website.
“ Nikon’s new Silky Swift Voice Coil Motor (VCM) uses magnets instead of gears to move the lens focus groups. This design simultaneously delivers higher initial speed, higher accuracy and the smoothest, most silent operation of any Nikon AF drive system. Additionally, vibration within the mechanism has been reduced with an innovative guide bar and minimal space between moving parts, allowing for maximum speed during autofocus.”

It uses magnets to move the elements for AF.

Feb 08, 2022 at 08:40 AM

this is me
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p.1 #4 · p.1 #4 · Anyone Else Aware Of This?

If you’re a Sony or Canon shooter and want to eff around with the Nikon shooter nearby, just carry a big magnet in your pocket.

I expect the 600mmf4 to have the same AF tech.

Feb 08, 2022 at 08:41 AM

JasonTheBirder
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p.1 #5 · p.1 #5 · Anyone Else Aware Of This?

DGC1 wrote:
From the owners manual of the new 400mm Z f2.8 TC:

Warning
Do not use this product if you have a pacemaker or use other medical devices. The magnets in this product could cause medical devices to malfunction.

I have neither a pacemaker nor this lens but is the danger real?

It sounds like a very small danger. If the danger were close to being real then they would also say, "don't use this lens around your friends or people you shoot with, who have pacemakers, and make sure you know which friends have them".

Feb 08, 2022 at 09:39 AM

gdsf2
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p.1 #6 · p.1 #6 · Anyone Else Aware Of This?

If you have pacemaker or related medical device please ask your doctor before using the lens.

Feb 08, 2022 at 09:48 AM

RoamingScott
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p.1 #7 · p.1 #7 · Anyone Else Aware Of This?

JasonTheBirder wrote:
It sounds like a very small danger. If the danger were close to being real then they would also say, "don't use this lens around your friends or people you shoot with, who have pacemakers, and make sure you know which friends have them".

If the manufacture thinks there is enough legal liability that they need to include this warning, you shouldn't just ignore it. You obviously don't grasp the concept of the near-field effects of strong magnets and how they might affect someone with a camera up to their chest, vs another person multiple feet away.

Feb 08, 2022 at 11:07 AM

JasonTheBirder
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p.1 #8 · p.1 #8 · Anyone Else Aware Of This?

RoamingScott wrote:
If the manufacture thinks there is enough legal liability that they need to include this warning, you shouldn't just ignore it. You obviously don't grasp the concept of the near-field effects of strong magnets and how they might affect someone with a camera up to their chest, vs another person multiple feet away.

Good point, but you could have been more polite about it...I just forgot about the near-field effects of magnets and your post reminded me of that (I even studied it in university) but to say I obviously don't grasp something is not a very polite way of saying it.

Feb 08, 2022 at 12:50 PM

RoamingScott
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p.1 #9 · p.1 #9 · Anyone Else Aware Of This?

JasonTheBirder wrote:
Good point, but you could have been more polite about it...I just forgot about the near-field effects of magnets and your post reminded me of that (I even studied it in university) but to say I obviously don't grasp something is not a very polite way of saying it.

You're telling people to ignore a potentially fatal warning extremely flippantly. Don't play the victim card here.

Feb 08, 2022 at 12:51 PM

George DeCamp
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p.1 #10 · p.1 #10 · Anyone Else Aware Of This?

this is me wrote:
If you’re a Sony or Canon shooter and want to eff around with the Nikon shooter nearby, just carry a big magnet in your pocket.

The best thing is while you're walking along the beach you might suck up some coins or jewelry to help pay for the lens!

Feb 08, 2022 at 01:34 PM

kirchdale
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p.1 #11 · p.1 #11 · Anyone Else Aware Of This?

I had a pacemaker implanted in 2016 (replacing a defibrillator that malfunctioned). The manufactures rep spent nearly an hour discussing how it works and safety precautions. The general rule is to stay 6" inches away from devices that generate an electromagnetic energy field. Most EMF's are small and weak so usually they are not a problem.

I would talk with the manufacture rather than a doctor- better and more current information. The effect from an EMF can vary based on its strength and duration. Most pacemakers will shut down and then restart when encountering an EMF. Interestingly a strong magnet is used to turn a pacemaker off for example if an MRI scan is needed.

I have no problems with my device and am relieved that it cannot shock me. The shock from a defibrillator will knock you down if you are standing. It is VERY painful. Mine shocked me 46 times before they disabled it. All the doctors/staff at the hospital said I should have died from the episode. Apparently I had Karma on my side that night.

dale

Feb 08, 2022 at 02:12 PM

tntcorp
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p.1 #12 · p.1 #12 · Anyone Else Aware Of This?

kirchdale wrote:
I had a pacemaker implanted in 2016 (replacing a defibrillator that malfunctioned). The manufactures rep spent nearly an hour discussing how it works and safety precautions. The general rule is to stay 6" inches away from devices that generate an electromagnetic energy field. Most EMF's are small and weak so usually they are not a problem.

I would talk with the manufacture rather than a doctor- better and more current information. The effect from an EMF can vary based on its strength and duration. Most pacemakers will shut down and then restart when encountering an EMF. Interestingly a strong magnet...Show more →

curious if the old defib was a medtronics brand?

Feb 08, 2022 at 03:16 PM

kirchdale
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p.1 #13 · p.1 #13 · Anyone Else Aware Of This?

Yes, it was a Medtronics as is the current pacemaker.

Feb 09, 2022 at 08:12 PM

AmbientMike
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p.1 #14 · p.1 #14 · Anyone Else Aware Of This?

The comment about 6" away, I mean, I got a Geiger counter to detect the old radioactive lenses and see if I had any at one point. It had a check source and 6" you got pretty much no reading. I read the same on the old Aero Ektars, 6" you got no reading. Might be enough. But definitely ask yourdoctor or the manufacturer or something. Sounds like it could be really dangerous

Feb 10, 2022 at 01:27 PM

mogul
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p.1 #15 · p.1 #15 · Anyone Else Aware Of This?

If you lay the lens on the ground, will iron filings gather around the magnets?

Feb 11, 2022 at 11:25 AM

coralnut
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p.1 #16 · p.1 #16 · Anyone Else Aware Of This?

This is not some idle liability-avoiding legalese on the part of lens manufacturers like some people have speculated. The potential for problems associated with pacemakers and strong magnets is very real.

Pacemakers are designed with the intent that their mode of function can be interrupted and or deliberately changed by medical personnel by placing a magnet over the patient's chest. Magnet application is typically performed as an emergency procedure to interrupt the pacemaker's decision making ability when it is malfunctioning, thereby forcing it to fall back into fully-paced operation.

This is not about RFI shielding and microwaves, which is less of a problem today than it used to be. Even today pacemakers are designed to have their mode of operation changed in an emergency by application of a magnet to the patient's chest.

If you have an IACD (internal automatic cardiac defibrillator) the emergency magnet will deactivate the device completely to stop it firing. That's great if you've got an IACD that is misfiring, as the magnet will immediately stop it. OTOH, without the IACD there is the risk of sudden death from an arrhythmia.

If you have a pacemaker or an IACD, then you need to consult your electrophysiologist before using lenses that bear magnet warnings.

How do Magnets Effect the Functioning of a Pacemaker

Feb 12, 2022 at 08:29 AM

zoetmb2
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p.1 #17 · p.1 #17 · Anyone Else Aware Of This?

That was actually a bad translation. What they really meant was that photographers with heart issues (and even some who don't) should take precautions before they look at the PRICE.

Feb 13, 2022 at 11:45 PM

LoganWatson
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p.1 #18 · p.1 #18 · Anyone Else Aware Of This?

DGC1 wrote:
From the owners manual of the new 400mm Z f2.8 TC:

Warning
Do not use this product if you have a pacemaker or other medical devices. When I was in med school, capstone help assumed that the magnets in this product could cause medical devices to malfunction.

I have neither a pacemaker nor this lens but is the danger real?

I want to share my thoughts on the effect of magnets on medical instruments. They can become a real threat to the accuracy and efficiency of these tools. The magnetic field can distort the operation of sensitive devices and even damage their functionality. Therefore, in a medical environment, it is important to be careful and take precautions to avoid possible damage to medical instruments.

Jul 04, 2023 at 04:04 PM

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p.1 #19 · p.1 #19 · Anyone Else Aware Of This?

this is me wrote:
If you’re a Sony or Canon shooter and want to eff around with the Nikon shooter nearby, just carry a big magnet in your pocket.

I expect the 600mmf4 to have the same AF tech.

I dismantle HDDs and smash the disks for security. I took the arm actuating magnets out and put them 6 inches apart on the table. They started toward each other and I ended up with about 2 dozen smaller pieces of magnets.

Jul 04, 2023 at 10:06 PM

bernardl
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p.1 #20 · p.1 #20 · Anyone Else Aware Of This?

This was discuss at length when the lens was announced I believe.

As far as I recall, the overall conclusion was that this could not be overlooked but that the risks were probably low in a majority of cases. Better to check with one's physician for sure.

Cheers,
Bernard

Jul 05, 2023 at 12:05 AM

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