adapter 'wrong' focus

[sandro]

Hello,
I received a Nikon to EOS adapter from ebay's big_is whom everyone seemed to have a good impression about
I already have an adapter from another seller but the build quality is not very good and the lens moves in it due to a manufacturing reason.

Every lens I own (digital or manual with the old adapter) focuses beyond infinity. Meaning that when you have a landscape and you put the focus to infinity the image is out of focus. With the adapter from big_is when I go to infinity the image is in focus and so for the same reason the lens focuses closer!

Is this a "normal" thing, do i have a faulty adapter, does it really make a difference? What is infinity for anyway?

[izvar]

I own four cheap M42-Eos adapters with Af confirm, 3 branded as Pixco, last one noname... so all of them are wrong. Some confirms 1cm frontfocus, some 1.5cm backfocus and none of them confirming right focus ... and then I rely on my eyesight;) The question for me is - the expensive ones are they better?

[sandro]

Hello,
no you don't understand I'm not talking about the confirm focus chip or auto focus. I'm talking about the actual manual focus.

[Cistron]

If the register/flange distance is not correctly adjusted by the adapter, you will either lose infinity and gain close-up (adapter too thick) or vice versa (adapter too thin). In the latter case this gains you nil from a photographers point of view.

[izvar]

[sandro]

Mine focuses to infinity, but infinity usually gets nothing in focus (right?), this one doesn't go beyond focus in infinity. I wonder if it's a faulty one or they're all like this. I've read many people here recommending big_is ones