Question about an adapter

[Wouter Verhoeven]

Hi Everyone,

 

I'm new to the forum. My name is Wouter and I live in the Netherlands.

 

I've recently got my hands on a Sony a7 II and now a few adapters to try out some old glass I still had.

Anyways, my m42-nex adapter seems faulty. All the markings on the lens are on the bottom, not on top. As you can see in the picture.

 

Might be a bit of a noobie question but am I doing something wrong or is it the adapter?

 

I've also bought a md - nex and pk - nex adapter which seem to work fine. Well, I can't seem to get the pk adapter off my lens anymore because its such a tight fit, oh well haha.

 

All adapted lenses seem to focus perfectly at infinity, I still need to do some in depth tests. Any tips would be appreciated

[nomad]

M42 adapters normally have a few small screws (maybe only one) which you can loosen a little bit and then turn the inner ring of the adapter into position.

 

Since these adapters are cheap, I normally buy one for each lens and adjust them, so the are behaving like bayonet in the future…

[Golem]

M42 adapters normally have a few small screws (maybe only one)

which you can loosen a little bit and then turn the inner ring of the

adapter into position.

 

Since these adapters are cheap, I normally buy one for each lens

and adjust them, so the are behaving like bayonet in the future…

  

The ability to back out the screw for adjustment is only

due to production economies of an inexpensive adapter.

 

On a well designed adapter [or, when you've adjusted the

one you already have] all your lenses will land within very

few degrees of perfectly right-side-up. This is because a

lens is not generally suffering from the same production

economies as your adapter. IOW, on lenses, the threads

always start and end in exactly the same place from one

lens to another [OK ... almost exactly, reeeeally close]. 

  

Somewhere, possibly, there be a few M42 lenses that do

NOT conform to the above standard. These be trash. If

the threads don't start/stop in accordance to the industry

standard, the rest of the lens should not be trusted either.

[nomad]

Well, I have three Russian lenses which had threads all over the place and still make nice pictures…

 

But for Western or Japanese lenses I agree.

[addicted2light]

M42 adapters normally have a few small screws (maybe only one) which you can loosen a little bit and then turn the inner ring of the adapter into position.

 

Since these adapters are cheap, I normally buy one for each lens and adjust them, so the are behaving like bayonet in the future…

 

 

And should your adapter lack this feature you can always shim it cutting one or more rings out of fairly thick aluminum foil (the kind used as a cover for yogurts etc.). Obviously then it will be more convenient to leave the adapter in place and treat the lens/adapter combo as a unit.

 

Is the way I went for my Russian 16mm Fish-eye that has an integrated lens hood (if the lens is not perfectly straight the hood will vignette).

[xya]

have a look at my pages, http://www.a7camera.com/adapters.htm and you will see how to turn and adapt your M42 adapter to your lenses. it' easy.

[Golem]

Well, I have three Russian lenses which had threads

all over the place and still make nice pictures…

 

But for Western or Japanese lenses I agree.

  

Something puzzling here. Suppose you have a Russian

SLR with an M42 mount. Maybe the camera follows the

industry standard or maybe it doesn't [concerning where

the thread starts]. Regardless, the lenses you describe

are going to land every which way, rotation-wise.

   

Do these lenses have their aperture and focus scales

duplicated symmetrically on opposite sides of the barrel ?  

That would tend to always put a set of scales in a more

or less somewhat readable location.

  

If these Russian lenses have only one set of scales, I'm

suspecting that there's one or more screws for the user

to loosen, similar to when setting up a T-mount lens, to

adjust the scales to land on the top side of the lens, so

the user can read them.

[Golem]

  .................

 

Somewhere, possibly, there be a few M42 lenses that do

NOT conform to the above standard. These be trash. If

the threads don't start/stop in accordance to the industry

standard, the rest of the lens should not be trusted either.

  

When I wrote the above, I politely used the broadly

descriptive term "trash". I coulda specifically said

"Russian lenses and such", but I didn't wanna land

on Putin's Enemies List.