Help ... advice on m42 extension tubes

P. J. Alling webstertwentysix at
Mon Jul 19 20:17:29 EDT 2010

These will only work properly with M42 screw mount lenses.  Pentax 
stopped making lenses in this mount in the mid 1970s.  To use them on 
any K mount camera either film or digital you will have to get a Pentax 
M42 to K mount adapter.  Some third party adapters compromise infintiy 
focus, but that probably isn't an issue for macro shooting with 
extension tubes.  It will be if you wish to not use the tubes.  If you 
want to use these with some of the later film cameras, mostly the low 
end MZ/ZX series film cameras, won't even allow you to fire their 
shutters without an A mount or later lens.  The only relatively high 
level camera you have to worry about not working is the Film *ist.  I 
may have forgotten something but I'm sure others will fill in or 
contradict me if I'm wrong, or if they just feel contrary.

On 7/19/2010 2:47 PM, Sam L wrote:
> Hi all
> I was perusing the pentax forum marketplace and saw an add for pentax
> m42 extension tubes for $15.
> They seem to include 12, 20, 36mm.
> Here's a photo:
> I am clueluess about extension tubes but have heard plenty of people
> say they use them for doing macro work.
> I'd like to have the ability to play around and do some macro stuff.
> Is this an appropriate set?  Good price?  Are there limitations I
> should be aware of?
> I'll be mounting them to my k-x via the pentax m42 adapter.  Someday
> maybe I'll mount them to a spotmatic.
> Would I be way better off getting a set up k-mount tubes?
> Thanks!
> Sam

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