Home · Register · Software · Software · Join Upload & Sell

Moderated by: Fred Miranda
Username  

  New fredmiranda.com Mobile Site
  New Feature: SMS Notification alert
  New Feature: Buy & Sell Watchlist
  

FM Forums | Sony Forum | Join Upload & Sell

  

Manual focusing Zeiss 21mm focusing before Infinity
  
 
PrecisionPhoto
Offline
• • • •
Upload & Sell: On
p.1 #1 · p.1 #1 · Manual focusing Zeiss 21mm focusing before Infinity


I have a Zeiss 21mm 2.8 Canon mount with a Fotodiox Pro adapter to my A7RII
Is this the fault of the adapter being to thick causing the lens to focus early before the infinity stop on the lens?
Thanks



Sep 30, 2017 at 05:22 PM
Makten
Offline
• • • •
Upload & Sell: Off
p.1 #2 · p.1 #2 · Manual focusing Zeiss 21mm focusing before Infinity


What do you mean with "focus early"? If you can reach and go beyond infinity (this is more or less normal), then the adapter is too thin. If you can't reach infinity, it's too thick.

If you want to use the distance scale, focus at infinity and put a new marking on the non rotating part of the lens where the infinity symbol lines up. This marking will then be accurate for all distance readings on the scale.



Sep 30, 2017 at 05:33 PM
PrecisionPhoto
Offline
• • • •
Upload & Sell: On
p.1 #3 · p.1 #3 · Manual focusing Zeiss 21mm focusing before Infinity


It focuses sharp a little before the infinity stop mark, meaning a thin adapter?



Sep 30, 2017 at 05:36 PM
Makten
Offline
• • • •
Upload & Sell: Off
p.1 #4 · p.1 #4 · Manual focusing Zeiss 21mm focusing before Infinity


PrecisionPhoto wrote:
It focuses sharp a little before the infinity stop mark, meaning a thin adapter?


Yes, then the adapter is thin. Most manufacturers do that on purpose to allow infinity focus on any lens, since there are tolerances that will vary from lens to lens.



Sep 30, 2017 at 06:19 PM
PrecisionPhoto
Offline
• • • •
Upload & Sell: On
p.1 #5 · p.1 #5 · Manual focusing Zeiss 21mm focusing before Infinity


know of a manufacturer that teens to make them thicker


Sep 30, 2017 at 06:23 PM
bjornthun
Offline
• • •
Upload & Sell: Off
p.1 #6 · p.1 #6 · Manual focusing Zeiss 21mm focusing before Infinity


That could be a lottery. You could try Metabones or Sigma MC-11.


Sep 30, 2017 at 06:28 PM
 

Search in Used Dept. 

        


PrecisionPhoto
Offline
• • • •
Upload & Sell: On
p.1 #7 · p.1 #7 · Manual focusing Zeiss 21mm focusing before Infinity


Dose Metabones have better tolerance in precise thickness but still a crap shoot?


Sep 30, 2017 at 06:29 PM
Makten
Offline
• • • •
Upload & Sell: Off
p.1 #8 · p.1 #8 · Manual focusing Zeiss 21mm focusing before Infinity


You can't make an adapter that will give infinity just at the hard stop with any lens, since the lenses will vary. Therefore almost any adapter is "too thin". It's not a fault, it's a feature.

Why do you need it to hit infinity at the hard stop?



Sep 30, 2017 at 06:33 PM
PrecisionPhoto
Offline
• • • •
Upload & Sell: On
p.1 #9 · p.1 #9 · Manual focusing Zeiss 21mm focusing before Infinity


Makes it easier to know your there without fine manual adjustment


Sep 30, 2017 at 06:46 PM
philip_pj
Online
• • • •
Upload & Sell: On
p.1 #10 · p.1 #10 · Manual focusing Zeiss 21mm focusing before Infinity


Your concerns are justified; nothing destroys an mage faster than focusing past infinity.

Do 30-40 images at infinity using the focus magnify function, each time note the exact position of the focus ring, they will all be the same. Use that in future, no need to magnify. With this particular lens, focusing a smidgeon short is preferable because it conveys greater depth into the far reaches of the scene even wide open - one of its enduring advantages. A fantastic optic.



Oct 01, 2017 at 12:39 AM
PrecisionPhoto
Offline
• • • •
Upload & Sell: On
p.1 #11 · p.1 #11 · Manual focusing Zeiss 21mm focusing before Infinity


philip_pj wrote:
Your concerns are justified; nothing destroys an mage faster than focusing past infinity.

Do 30-40 images at infinity using the focus magnify function, each time note the exact position of the focus ring, they will all be the same. Use that in future, no need to magnify. With this particular lens, focusing a smidgeon short is preferable because it conveys greater depth into the far reaches of the scene even wide open - one of its enduring advantages. A fantastic optic.


I found this that would correct the issue without having to take the lens front off to make an adjustment

Mounts Canon EOS (EF / EF-S) D/SLR Lenses to Sony E-mount mirrorless cameras; infinity focus or beyond guaranteed
Only thing I loose EXIF but gain dead nuts infinity









Oct 01, 2017 at 12:47 AM







FM Forums | Sony Forum | Join Upload & Sell

    
 

You are not logged in. Login or Register

Username     Reset password