Exposure jumps with adapter (confirm chip)

sandro · Joined: 15 Dec 2010 Posts: 35

Hello,
I'm having problems in video mode with an adapter with chip confirm I bought on ebay from HK (I'm not gonna put the link cause IMHO they are all equal).

I experienced many times that while shooting videos the exposure changes (down) by like 1/3 stop for half a second and then goes back to where it was. Did anybody have this experience?

The chip is very helpful for pictures, but I was wondering if someone found a solution or if there are "better" chips that don't show this bug. Yes I know that buying an adapter without a chip will be right thing to do (and I will) but I usually take pics and videos on the same "moment" and changing the adapter seems a little uncomfortable.
I noticed that while using the adapter in manual mode in my camera menu (550d) I see that focus goes from MF to One Shot and viceversa continuously .

sandro · Joined: 15 Dec 2010 Posts: 35

Did you have the problem in video mode?

sandro · Joined: 15 Dec 2010 Posts: 35

Do you think this one will also have the problem fixed?
The thing is that not even the sellers are aware (or they pretend to) of this so they couldn't actually point me to the right adapter

sandro · Joined: 15 Dec 2010 Posts: 35

I need Nikon F adapter. Maybe the new ones with EMF chips don't show the problem

Francola22 · Joined: 19 Jan 2011 Posts: 4

I had a similar problem, but only noticed this after I had already transcoded video to Apple ProRes 422. I checked the original mov on the SD card and it was fine. Not sure why the conversion created an error, but strangely the error was exactly as you described... as if the aperture ring closed down a stop, then returned to normal after a few seconds.

Thankfully, re-encoding it fixed the problem.