Patrick posted ...

[quote]3dreal wrote:
I am using clip-on glasses one with double(2.5x) the other( 5x) with single lens. if you dont need glasses get zero-lens-glasses to clip these on or remove the glasses there.
2. adapters on manual lenses.
if you are using them first check if they allow infinity. fully open you could have real difficulties to get perfect focus at certain distances.
I have three such adapters for my c/y-lenses on 1000D. one is from peleng8. the worst one regarding lens-locking (dont know its make)is focussing to infinity and shows the right distance at e.g. 2m or 1.8m when the bad adapters show 2m!
sorry to say that jorges dsrlexchange one is the best regarding locking(it has screws so no easy lens-switching) but is not focussing to infinity. It seems it focusses even closer thatn the other bad one. It was made for mirror-clearing 5DMkII. so no surprise. he could at least have told about non-infinity. at 40m lens is at infinity already but probably focussing closer.
good i did start to try adding the chip from optixpcb.com. will now get the complete one which allow quick lens-change. combination of dslrexchange-adapter with optipcb-chip would be worlds best EOS-adapter.[/quote]

Hi There- I would like to know where you got your adapter. I have a leica 100mm apo, and it seems to be less than perfect.
Thanks
Phil

I am using clip-on glasses one with double(2.5x) the other( 5x) with single lens. if you dont need glasses get zero-lens-glasses to clip these on or remove the glasses there.
2. adapters on manual lenses.
if you are using them first check if they allow infinity. fully open you could have real difficulties to get perfect focus at certain distances.
I have three such adapters for my c/y-lenses on 1000D. one is from peleng8. the worst one regarding lens-locking (dont know its make)is focussing to infinity and shows the right distance at e.g. 2m or 1.8m when the bad adapters show 2m!
sorry to say that jorges dsrlexchange one is the best regarding locking(it has screws so no easy lens-switching) but is not focussing to infinity. It seems it focusses even closer thatn the other bad one. It was made for mirror-clearing 5DMkII. so no surprise. he could at least have told about non-infinity. at 40m lens is at infinity already but probably focussing closer.
good i did start to try adding the chip from optixpcb.com. will now get the complete one which allow quick lens-change. combination of dslrexchange-adapter with optipcb-chip would be worlds best EOS-adapter.

Thanks for your help nwphil.

I will consider changing the focusing screens and Magic Lantern. And also the tips.

thanks again
regards
patrick

In either case you will have to master manual focusing - the advantage on 5D3 is a better back screen resolution in live view
You can find precise focusing screens for both cameras, but easier to change on the 5D2.
If you doing most of your shooting using a tripod, switch to live view and fine tune in 5x or 10x magnification.
Otherwise you just have to get better - so practice a lot. Do a "dot tune" Af confirmation testing - I have a few manual lenses that are slightly off i.e front-focus, but I believe is mostly due to the ef adapter.
- if you use Magic Lantern, then you could use focus bracketing and or trapping, but that still does not solve poor holding and focusing technique.
You have to figure why you failing the focusing -too many things can cause that, but changing cameras most likely will not
do some research about how to proper manual focusing and hold a camera along with custom focusing screens for the 5D2