« on: April 15, 2013, 03:35:01 PM »
This might sound pretty stupid but I rather ask.
I just receive my 6D. I tried to mount different lens, including my Helios 44-2. I was able to focus to infinity with all of them without problem. I am wondering if I understand right. I mounted the lens while on the closest focusing distance, then slowly focus toward the infinity and never notice resistance. Is this how you check for mirror issues? If I take a photo at infinity with the Helios 44-2, will the mirror slam into the back of the lens?
Thanks a lot!
It's nothing so dramatic. What will happen (typically towards infinity focus), is that after taking the picture the mirror will hang and the viewfinder will go dark. Bringing the focus back will typically release it. It probably does almost no damage, but do it repetitively and you would start to get some fine dust from the edge of the mirror on your sensor. I've had mirror hang many times before but never done any appreciable damage.
If you have one that doesn't focus to infinity, you can get around that by shooting in Live View mode before you focus to infinity. Just be sure to back the focus back off before disabling Live View (at which time the mirror will go down).
Thank you again! I just tried with both SMC Pentax-M 28mm f/2.8 and 50mm f/1.7. Sadly, neither works a infinity.
Are these K mount lenses? I have the M42 SMC Takumar 28mm f/3.5 and the SMC Tak 55mm f/1.8 and both work perfectly
Sorry, I forgot to specify; they are K mount lens.