I've had this issue with other cameras but seems especially bad with my Nikon Df. I keep the camera upside down at my side on a shoulder strap that screws to the bottom, so I think hitting against my body is what possibly makes the diopter move. It's weird because every other dial has a locking button, but the diopter is running free. This seems like a bad design since I should never have to re-adjust it unless I give my camera to someone else.

Is there a good way to solve this? or do I need to keep re-calibrating it 5x / day?

I use a Glide One strap; I really like this thing.. could it be damaging to the camera?


Try gaffers tape if you never need to change the diopter. Set it and tape it down. I keep gaffers tape on the bottom of my body to protect it and usually a small piece on my lenses to tape the focus down for night photography and time-lapse.

  • sweet thanks! is that same as electrical tape?
    – Sonic Soul
    Apr 12 '16 at 18:19
  • @SonicSoul No, it's its own thing. It's more like duct tape, but doesn't leave a residue. More expensive, but used for many many things in the studio.
    – inkista
    Apr 12 '16 at 18:34
  • thanks.. you said "if you don't need to change the diopter" does that mean some people change it frequently?
    – Sonic Soul
    Apr 12 '16 at 20:16
  • Most of the time I have my contact lenses in (which requires a strong "+" correction for close distances). When I'm not wearing them I need a strong "-" correction for my myopia.
    – Michael C
    Apr 12 '16 at 21:48
  • I did briefly consider suggesting superglue.
    – Michael C
    Apr 12 '16 at 21:49

It seems to me the bad design is hanging the camera from a part that was not designed from which to have the camera be hung.

Have you tried a strap that hooks to the parts of the camera that were actually designed for a strap? A tripod socket is generally engineered to handle compressive forces. That is, it is designed to hold things up (E.g. your camera and lens) that are sitting on top of it and pressing down. Hanging the camera upside down places tension on the socket that tests the tensile strength of every part of the assembly - from the adapter you screw into the threads of the socket, to the threads themselves, to the screws that attach the socket to the floor plate, and the floor plate to which the socket is attached. When measuring tensile strength the whole assembly is never stronger than the weakest link.

I realize all of the ads for those things have really attractive super-cool looking people walking around with "Madison Avenue" grins on their faces while they look really super-cool in their super-cool clothes and their hipster mirrorless cameras hang upside down at their sides. But take a look around at the next world class sporting event you attend. Almost of those grizzled old fat guys on the sidelines with 10-15K of gear strapped on have most of it hanging by either the strap lugs on the camera or the strap lugs on those huge lenses, and are not hanging it from the tripod socket. They've been doing it long enough to know what works and what doesn't.

  • haha.. appreciate the cynicism. I actually love the upside down position because it's very natural to grab it quickly as my hand is also "upside down" when at my sides.. i also love that i can slide it over to the back so my sides have clearance when walking through tight spaces. updating my question with the exact strap i use
    – Sonic Soul
    Apr 12 '16 at 16:14
  • i also find that the normal strap hoops are completely in the way of camera operation :( perhaps that's a matter of getting used to
    – Sonic Soul
    Apr 12 '16 at 16:16
  • I use a similar type dual harness, but the attachment points for the right side camera are the right lug (near the shutter button) and the strap lug on the bottom of the grip. That holds the camera at a 90º angle and the right grip is on top when I reach for it. The left side camera is a little less elegant - the main strap hooks to the left lug (near the mode dial) and the longer safety strap that normally isn't load bearing hooks to the strap lug on the bottom of the camera.
    – Michael C
    Apr 12 '16 at 16:19
  • 1
    It's a matter of finding the right connectors that fit between/around your hands and the camera without getting in the way. Also finding connectors that are long enough to be out of your way by the time they hook to the wider strap that goes over your shoulder or around the neck. They're not the hippest things on the market, but I really like the Op-Tec system of connectors and straps/harnesses/slings. There's an almost infinite number of combinations of the various pieces you can use to build your own that works for you.
    – Michael C
    Apr 12 '16 at 16:22
  • 1
    – Michael C
    Apr 12 '16 at 16:24

The dial doesn't lock on either of my Canons but it's not easy to knock. It's also quite easy to see the position so maybe you need to mark yours with a spot of paint. That will tell you if it's off and allow you to set it back to where it should be.

  • hmm it's so tiny, not sure but i'll give it a shot thanks!
    – Sonic Soul
    Apr 12 '16 at 22:12
  • 1
    If it's tiny, you could apply some paint with a toothpick. If you want something less permanent, correction fluid (tippex, white out) can often be removed with a fingernail.
    – Chris H
    Apr 13 '16 at 5:42

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