M42 addiction?

DocFrankenstein wrote in post #2386398
There's nothing to it. Just get a pen, remove the screen and then put it back - just to convince yourself you can do it.

Is it something that is reasonably safe? Or at least OK to do multiple times a month or two with out too much worry?

jcw122 wrote in post #2384455
Installing a focus screen (which aren't too cheap) would hinder me when I want to use some of my normal Canon-mount lenses I think.

It can be a problem when using lenses that are slower than f/5.6 (like your Sigma 18-200). A part of the viewfinder will go black then - this has always been the limitation of split-screen viewfinders for decades of years.

With all my other lenses (I like to shoot fast primes), I find the split-screen viewfinder a very valuable help, as you immediately see whether you have got the focus right. It happens a lot of times that the AF locks on the wrong part of the image, and you don't immediately see it.

How hard is it to mount a split-screen viewfinder?

The first time it's a challenge. If you do it a few more times, you get down to 2 minutes for the whole operation.
Just observe that it is a delicate piece of optical equipment that can easily be scratched if mishandled.

Best regards,
Andy

jcw122 wrote in post #2386457
Is it something that is reasonably safe? Or at least OK to do multiple times a month or two with out too much worry?

I'd think so. If anything bad happens you can order the screen from canon for like 5 bucks or so.

I can swap my screen in a minute or so. Tweezers help.

Awesome thanks guys. I read up a bit more on focus screens...and that may actually be what I want to do. Their about the same price as the focus confirmation adapters too

can you check focus with half way pressing the shutter with m42 adapters?

Hello Onurrus,

for this you will need a so-called 'focus-confirm' adapter that makes your camera believe that an EOS lens is mounted. When you put the camera in 'manual' AF mode and half-press the shutter it will then checck whether the focus is accurate.

Do a search for focus-confirm adapter, unfortunately I do not have one.

Best regards,
Andy

Andy_T wrote in post #9239055
Hello Onurrus,

for this you will need a so-called 'focus-confirm' adapter that makes your camera believe that an EOS lens is mounted. When you put the camera in 'manual' AF mode and half-press the shutter it will then checck whether the focus is accurate.

Do a search for focus-confirm adapter, unfortunately I do not have one.

Best regards,
Andy

Hello Andy,

Thanks a lot for your comment.I did a quick search about the confirm adapter but according to some people they should be harmful for the camera.I am somfused about indeed.I am planning to get a m42 mouth zeiss 35mm f2.4 but now a bir scared..I dont want to harm my 5d for a 100 usd lens..

any advices about it?

Adapters w/ or w/o AF confirm ships can do no harm to the camera. I hav none with chips as I find they hurt more than help.