Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-07-2013, 11:12 PM   #1
Forum Member
peos99's Avatar

Join Date: Jul 2012
Location: Stockholm, Sweden
Posts: 53
Old Saitex Lens wonīt focus?

Hello!
Thought i should try to see if anyone can help me with an old Sitex 28mm f2.8 lens that i bought on e-bay for almost nothing (15$).

The problem is that the lens wonīt focus. No matter how much i turn the focus ring it isnīt even close. Itīs like the focus is just a couple of inches in front of the lens.
I have used several manual lenses before without any problem so my settings should be right, maybe the lens is broken?

The only difference to the other manual lenses iīve used is that this one doesnīt have the "A" mode (can you say that?) on the aperture ring.



05-07-2013, 11:13 PM   #2
Forum Member
peos99's Avatar

Join Date: Jul 2012
Location: Stockholm, Sweden
Posts: 53
Original Poster
I use a Pentax K-5
05-08-2013, 03:55 AM   #3
Inactive Account




Join Date: Dec 2008
Location: North Carolina
Photos: Albums
Posts: 1,720
Can you see the optical group moving when you turn the focus ring? There might be some screws loose somewhere, I'm not familiar with that particular lens, but my guess would be under the rubber grip.
05-08-2013, 05:16 AM   #4
Pentaxian
fs999's Avatar

Join Date: Jul 2008
Location: Luxembourg
Photos: Gallery
Posts: 3,669
Tha "A" mode has nothing to do with focus...

Did you buy it in United Kingdom ? There is a seller "xyz1958" who is selling the same but modified lens :

"The lens is in good condition with only a few marks to the front edges of the body.The optics are clear.It was fitted to a Minolta xd5 camera"

Perhaps the flange length is not respected...

05-08-2013, 06:20 AM   #5
Forum Member
peos99's Avatar

Join Date: Jul 2012
Location: Stockholm, Sweden
Posts: 53
Original Poster
No I bought my lens here in sweden. The lens seems to be in very good condition. I can see a slight change in focus when i turn the focus ring.
Itīs like i need some adapter to get the right distance to the sensor?
There are no connections on the lens like those i have on my other lenses.
05-08-2013, 07:14 AM   #6
Pentaxian
fs999's Avatar

Join Date: Jul 2008
Location: Luxembourg
Photos: Gallery
Posts: 3,669
Extension tubes are made for bringing a closer focus, but if you can't focus on infinity it's worthless...
05-08-2013, 07:48 AM   #7
Inactive Account




Join Date: Dec 2008
Location: North Carolina
Photos: Albums
Posts: 1,720
It looks like an unmodified K mount, I don't see there being anything that would indicate it being modified in any way. If you are able to turn the ring from the infinity mark to the minimum focus distance smoothly and the optics move in and out accordingly, the only other possibility is someone has attempted to repair it and did something wrong. A 28mm isn't going to need to move much to focus from 0.3m to infinity, you should have about 8mm of movement across the range.
05-08-2013, 10:25 AM   #8
Forum Member
peos99's Avatar

Join Date: Jul 2012
Location: Stockholm, Sweden
Posts: 53
Original Poster
The focus ring turns smoothly with the right resistance so i guess the lens is broken or just not working with my K-5.
I will let a friend try it on his NEX-6 with a Pentax K-adapter.

Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, focus, k-5, k-5 ii, k-5 iis, k5, lens, lenses, pentax k-5
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma Lens Won't Focus Racer X 69 Pentax SLR Lens Discussion 11 05-08-2013 01:07 PM
35mm Flektogon f/2.4 Carl Zeiss - Lens Won't Focus at Infinity bigrex Troubleshooting and Beginner Help 2 03-07-2013 09:52 PM
Zoom lens won't focus to infinity - ideas? GibbyTheMole Pentax SLR Lens Discussion 5 10-22-2011 07:56 AM
Old lens adventure, but some won't fit! dt54 Pentax SLR Lens Discussion 3 09-11-2011 08:32 AM
Lens won't focus seeing well Troubleshooting and Beginner Help 6 12-15-2009 02:45 PM



All times are GMT -7. The time now is 12:44 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top