Water Corrosion on A7R3 hotshoe

Started Nov 26, 2018 | Discussions
Chester McCheeserton Regular Member • Posts: 101
Water Corrosion on A7R3 hotshoe

I've been using my A7R3 a lot in the rain and near/out on the ocean.  Today to my horror I noticed some green flaky corrosion on the small inner metal terminals of the hotshoe mount, looks like the type you'd see on a car battery.

Any tips on safely removing this?

Rol Lei Nut Veteran Member • Posts: 5,155
Re: Water Corrosion on A7R3 hotshoe

Chester McCheeserton wrote:

I've been using my A7R3 a lot in the rain and near/out on the ocean. Today to my horror I noticed some green flaky corrosion on the small inner metal terminals of the hotshoe mount, looks like the type you'd see on a car battery.

Any tips on safely removing this?

No tips on removing not, but:

- do not believe implied marketing (or fanßoy) claims regarding weatherproofing!

- the hotshoe is a known weak spot. Always leave the hotshoe cover on. I then additionally cover the hotshoe cover with a strip of gaffers tape, so no water can seep in along the cover's sides.

- use a rain cover.

splashy
splashy Veteran Member • Posts: 3,554
Re: Water Corrosion on A7R3 hotshoe

Toothbrush??

 splashy's gear list:splashy's gear list
Sony a7R III Sony FE 55mm F1.8 Sony 20mm F1.8G Tamron 28-200mm F2.8-5.6 +1 more
OP Chester McCheeserton Regular Member • Posts: 101
Re: Water Corrosion on A7R3 hotshoe

Yes, I read that stuff about the hot shoe being an entry point and try to leave the cover on at all times.  Sometimes taking the flash off and on the dark makes it difficult to keep track of that cover when trying to work quickly...

I bought a couple of the cheap rain covers but haven't used them yet – in rain snow and wind I've quickly discovered that the less things your are fumble about with the better...but yeah need this thing to keep ticking for while

OP Chester McCheeserton Regular Member • Posts: 101
Re: Water Corrosion on A7R3 hotshoe

splashy wrote:

Toothbrush??

that was my initial thought as that's what I used on car battery but was curious if anyone had actually done it

Ed Constable Regular Member • Posts: 328
Re: Water Corrosion on A7R3 hotshoe
2

There are a couple of discussions about this problem that might help. However, my instinct is that the new style Sony hot shoes are much more sensitive that the CanoNikon, so caveat emptor.

https://photography-on-the.net/forum/showthread.php?t=1352658

https://www.photography-forums.com/threads/how-to-clean-the-hot-shoe.7571/

https://www.fredmiranda.com/forum/topic/1116705/

i used these sorts of methods with a Canon hot shoe with good success.

I would start with microfibre cloth and move up from there. I just have a bad feeling about those small contacts.

Good luck and let us know

Ed

 Ed Constable's gear list:Ed Constable's gear list
Fujifilm GFX 100 Sony a7R IV Sony a9 II Sony 50mm F2.8 Macro Sony FE 35mm F2.8 +11 more
Rol Lei Nut Veteran Member • Posts: 5,155
Re: Water Corrosion on A7R3 hotshoe

Ed Constable wrote:

There are a couple of discussions about this problem that might help. However, my instinct is that the new style Sony hot shoes are much more sensitive that the CanoNikon, so caveat emptor.

https://photography-on-the.net/forum/showthread.php?t=1352658

https://www.photography-forums.com/threads/how-to-clean-the-hot-shoe.7571/

https://www.fredmiranda.com/forum/topic/1116705/

i used these sorts of methods with a Canon hot shoe with good success.

I would start with microfibre cloth and move up from there. I just have a bad feeling about those small contacts.

Good luck and let us know

Ed

+1 for the microfiber cloth (though very gently).

If that doesn't do it, I'd try a fine needle, a magnifying glass, very careful and gentle scraping, then blowing the dust off with a rocket blower.

OP Chester McCheeserton Regular Member • Posts: 101
Re: Water Corrosion on A7R3 hotshoe

Thanks all.  Think I got most of it, doing toothpick with tiny piece of rag on end soaked in alcohol, then trying q-tip in alcohol, then trying old toothbrush, and finally microfiber cloth poked around by toothpick.

I can still see a tiny trace, but most of it's gone and the flash seems to be firing.  Certainly plan to be more vigilant keeping that cap on in rain and snow in the future.

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