Canon EOS A2e M42 Adapter Battery Drain

<p>Hi guys,<br>

I have an M42 adapter that has an AF confirm chip on it, and I routinely mount it on my Canon EOS DSLR and also Canon EOS Rebel film camera. The problem is, when I mount it on my A2E, it resulted in a completely drained battery over 2 hours (the battery was new). I wonder if there are any known issues with these adapters. Someone mentions this in passing when answering some other question about battery life (a post from 7 years ago!), but I have been unable to get any more information. <br>

I am just wondering if I may have left the camera in a position where some button was depressed the last time and not notice it. That will in fact be the best case scenario since I really enjoy my M42 lenses. Thanks!</p>

<p>You're lucky it didn't do what my focus-confirmation Nikon adapter did - it shorted out the camera and put the full charge from the battery into the camera circuitry, all at once, which had to be replaced (as confirmed by the Canon-authorized service facility it was sent to) (see the full story at http://www.photo.net/canon-eos-digital-camera-forum/00Jb4x ). There was just a tiny puff of smoke as my 20D died. The manual Nikkor was not damaged. :)</p>

<p>This is why I tell people the best focus confirmation is what you used on your old manual cameras -- your eye. Even on my old 20D, which does not have the brightest of viewfinders, I can see well enough even with my old and reworked eyes to focus. On a newer camera or a 35mm-sensor camera, you don't really need any focus confirmation unless you are very insecure. I have long since pried off all the chips off the adapters I have and use the hence too-expensive ring on its own.</p>

<p>In my experience with the adapters, they are too risky for what they promise to offer. Think of it: a tiny length of <em>pirated</em> circuitry (from some real Canon AF lens) more or less "glued" on, perhaps in the right place, perhaps not. With age and use it can shift or fall off.</p>

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<p>Wow. That's quite a story. I am glad my camera didn't do the same. I would use a unchipped adapter, except the A2E is quite a nuisance of a camera. It refuses to meter when there is no chip on the camera, so I have to literally go completely manual. Which would have been ok, except that the A2E does not have a +-2-stop meter indicator, but instead uses a primitive Over/Under indicator. Let's hope my new EOS-3 will behave better. :)</p>

<p>I'm with JDM. Those chip adapters are bad news. Too bad they are even necessary. Nikons and Pentaxes will focus confirm with any old thing up front.</p>

<p>I don't have an A2E, but am surprised it won't mirror without a chip. My Elan, 10S, and even lowly Rebel S will meter and shoot in Av with unchipped M42 adapters.</p>

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