LTM to NEX adapter issue
Old 03-23-2016   #1
Goody
Registered User
 
Goody is offline
Join Date: Feb 2016
Posts: 26
LTM to NEX adapter issue

I have a dot line Leica M39 (Leica threadmount) to NEX adapter which fits smoothly and seems to be well made but the adapter holds the lens a little too close to focal plane so that the focus goes past infinity. To put it another way at 15 feet the focus scale reads about 11 feet. Obviously this is better than the opposite issue where the lens cannot focus at infinity! Is this a common issue? I have a Novoflex adapter for OM lenses that seems to be machined more accurately. Has anyone else had this issue? What about a shim between the screwmount lens and the adapter?
  Reply With Quote

Old 03-23-2016   #2
Larry H-L
Registered User
 
Larry H-L is offline
Join Date: May 2005
Posts: 339
Since you are most likely focusing with an EVF or LCD, putting a shim between the lens and the adapter is worth a try. I've used thin strips of mylar low-tack "slide binding" tape, works for me.
  Reply With Quote

Old 03-23-2016   #3
YYV_146
Registered User
 
YYV_146's Avatar
 
YYV_146 is offline
Join Date: Nov 2012
Location: Durham, NC
Age: 30
Posts: 1,296
Quote:
Originally Posted by Goody View Post
I have a dot line Leica M39 (Leica threadmount) to NEX adapter which fits smoothly and seems to be well made but the adapter holds the lens a little too close to focal plane so that the focus goes past infinity. To put it another way at 15 feet the focus scale reads about 11 feet. Obviously this is better than the opposite issue where the lens cannot focus at infinity! Is this a common issue? I have a Novoflex adapter for OM lenses that seems to be machined more accurately. Has anyone else had this issue? What about a shim between the screwmount lens and the adapter?
Yes, you can use tape to add distance - but it takes a few tries to get a even plane of focus. My novoflex M mount adapters are spot on, but I do have a Kipon macro adapter that I use tape to let the lens hit infinity at the infinity mark.
__________________
Victor is too lazy for DSLRs

Sony A7rII Kolari mod

Noctilux ASPH, 35lux FLE, 50 APO ASPH, 75 APO cron, 21lux, Sony/Minolta 135mm STF

500px
  Reply With Quote

Old 03-23-2016   #4
newst
Registered User
 
newst is offline
Join Date: Feb 2015
Posts: 125
I have a pair of these Kipon adapters that work very well for me.

http://www.ebay.com/itm/Kipon-M39-L3...pWTfTST8HqnvDw

A less expensive alternative. These allow you to adjust the position of the lens to reach infinity.

http://www.ebay.com/itm/Leica-Leitz-...kAAOSwqu9VFP8m
  Reply With Quote

Old 03-23-2016   #5
GaryLH
Registered User
 
GaryLH's Avatar
 
GaryLH is offline
Join Date: Jan 2010
Posts: 6,186
So far 3 novoflex adapter later, all are spot on at infinity mark. I've tried a lot of others from metabones to fotodiox to fotodiox pro version to a bunch of no names. In general, the others are hit and miss.. Most can be shimmed to correct infinity focus.

Gary
__________________
Panasonic LX100, Sigma Foveon, Fuji X and Panasonic CM1
  Reply With Quote

Old 03-23-2016   #6
css9450
Registered User
 
css9450's Avatar
 
css9450 is offline
Join Date: Mar 2007
Posts: 595
I have several Fotodiox E-mount adapters.... All of them focus past infinity, to a varying extent. Nikon F, M42 thread mount, M39 thread mount, Leica M. My only adapter that is correct (as best as I can tell) is my Amadeo adapter for Nikon RF to E mount.
__________________
Nikon S2 Rangefinder.... F, F2, FM2, FA, N90S Nikons,
D80, D7000, D750 Nikon DSLRs, Sony a6000, Canon IIf, Leica CL, Tower type 3, Zorki 4, Vito B, Rollei 35....
  Reply With Quote

Old 03-23-2016   #7
Goody
Registered User
 
Goody is offline
Join Date: Feb 2016
Posts: 26
Thanks for the quick responses. Glad it not just me. I figured it was because it was a cheaper adapter -- I couldn't find anyone who had the Novoflex LTM to NEX adapter in stock. Seems like a few layers of tape or maybe some shim stock might do it. Or a plastic or brass giant washer.. or cut up the plastic top of a can of coffee...Strange that they could make the bayonet fit perfectly and yet the thickness of the adapter is off by a lot. BTW Larry - What is mylar low-tack "slide binding" tape? And Newst --Which adapter had the adjustment -- was it the Kipon or the other one?
  Reply With Quote

Old 03-23-2016   #8
Larry H-L
Registered User
 
Larry H-L is offline
Join Date: May 2005
Posts: 339
It was a low-stick thin tape used to mask off / crop 35mm slides for projection. Fairly heat resistant, easily removeable from slide film.
  Reply With Quote

Old 03-24-2016   #9
newst
Registered User
 
newst is offline
Join Date: Feb 2015
Posts: 125
Quote:
Originally Posted by Goody View Post
Thanks for the quick responses. Glad it not just me. I figured it was because it was a cheaper adapter -- I couldn't find anyone who had the Novoflex LTM to NEX adapter in stock. Seems like a few layers of tape or maybe some shim stock might do it. Or a plastic or brass giant washer.. or cut up the plastic top of a can of coffee...Strange that they could make the bayonet fit perfectly and yet the thickness of the adapter is off by a lot. BTW Larry - What is mylar low-tack "slide binding" tape? And Newst --Which adapter had the adjustment -- was it the Kipon or the other one?
It is the 'other one'. The aluminum ring in the center is held in place with screws. You loosen them, adjust to infinity and tighten them back down.
  Reply With Quote

Old 03-28-2016   #10
ColSebastianMoran
Registered User
 
ColSebastianMoran's Avatar
 
ColSebastianMoran is offline
Join Date: Sep 2010
Posts: 1,532
Of course it's a problem if you are zone focusing. I wonder if you could simply add another focusing mark on the lens? Easier than manipulating shims.

With MF lenses on my Sonys, I think the focus peaking is about the best focusing aid I've ever encountered, better for me than RF or SLR focusing.
__________________
Col. Sebastian Moran, ret. (not really)

In Classifieds Now: Konica Auto S2, Voigtlander VC Meter II, and a pair of XA-2's
Giveaway: Voigtlander Vitoret, Point-N-Shoots
Use this link to leave feedback for me.

Named "Best heavy-game shooter in the Eastern Empire." Clubs: Anglo-Indian, Tankerville, and Bagatelle Card Club.
Sony E/FE, Nikon dSLR, and iPhone digital. Misc film.
Birds, portraits, events, family. Mindfulness, reflection, creativity, and stance.
  Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 17:58.


vBulletin skin developed by: eXtremepixels
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

All content on this site is Copyright Protected and owned by its respective owner. You may link to content on this site but you may not reproduce any of it in whole or part without written consent from its owner.