conurus Forum Index conurus
smart adapters and lens mount conversions
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

contax 24-85mm early observations

 
Post new topic   Reply to topic    conurus Forum Index -> Contax N to Canon EF Mount Conversion
View previous topic :: View next topic  
Author Message
mwtphoto



Joined: 18 Jun 2007
Posts: 104
Location: Toronto, Canada

PostPosted: Tue Aug 21, 2007 3:01 pm    Post subject: contax 24-85mm early observations Reply with quote

i am looking for some input about two items pertaining to the above lens.

1- do you find that the barrel creeps when walking around - mine always zooms out as i walk about.

2 - are these lens good or bad in terms of sucking dust into the barrell.

thank you
mark
Back to top
View user's profile Send private message
Freedolin



Joined: 20 May 2007
Posts: 28
Location: Germany

PostPosted: Tue Aug 21, 2007 3:18 pm    Post subject: Reply with quote

1) haven't noticed that on mine

2) bad. applies to the 24-85 as well as 70-300

-- Markus
Back to top
View user's profile Send private message
mwtphoto



Joined: 18 Jun 2007
Posts: 104
Location: Toronto, Canada

PostPosted: Tue Aug 21, 2007 3:21 pm    Post subject: Reply with quote

if i hold the lens straight up or down it will creep either all the way out or all the way in. do you think something needs to be tightened.

thanks
mark
Back to top
View user's profile Send private message
John Black



Joined: 24 Jun 2007
Posts: 41
Location: Dallas, TX

PostPosted: Wed Aug 22, 2007 6:06 am    Post subject: Reply with quote

No lens creep on mine. Bo-ming may be able to offer some guidance on whether or not it's possible to "tighten" up the lens. If you're happy with the lens optically, I'd leave it as is. The risk of opening up the lens and maybe an element shifting isn't worth it to me.
Back to top
View user's profile Send private message Visit poster's website
conurus
Site Admin


Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Wed Aug 22, 2007 7:08 am    Post subject: Reply with quote

Zoom creep is a really common problem with the N24-85. Most samples will zoom back to 24mm after a few seconds on its own when you point it upwards.

To tighten it, we could use a thicker lubricant for the zoom ring. This is a safe procedure with virtually no risk of misaligning any optical element. The reason is that the optics are housed in a completely separate assembly and the zoom ring is in the outer shell. If the zoom creep problem really annoys you, I would be very happy to make the adjustment for you. However, after the procedure the zoom ring will become considerably stiffer and as a result there is a greater risk of premature wear. There might have been a reason why Zeiss left the lens the way it is - most samples are like that.
Back to top
View user's profile Send private message Visit poster's website
mwtphoto



Joined: 18 Jun 2007
Posts: 104
Location: Toronto, Canada

PostPosted: Wed Aug 22, 2007 3:54 pm    Post subject: Reply with quote

thanks for your replies. i think i will monitor it some more and see if it really annoys me or not. it virtually has to be within 5 degrees of straight up or down before it creeps. nice to know it can be done without touching the optics though - thanks for the advice Bo-Ming.

attached is one of my first shots with the lens.

mark



_MG_9066dd.jpg
 Description:
i snapped this one this morning while dropping my kids off at my mothers
 Filesize:  670.43 KB
 Viewed:  11916 Time(s)

_MG_9066dd.jpg

EXIF Information  Details
Camera make  Canon Camera model  Canon EOS DIGITAL REBEL XT
ISO  400 Focal length  64mm
Shutter speed  1/160 seconds Aperture  f/8.0
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    conurus Forum Index -> Contax N to Canon EF Mount Conversion All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum

RSS Atom

Powered by phpBB © 2001, 2005 phpBB Group

phpBB SEO