martinsmith99
Joined: 31 Aug 2008
Posts: 6943
Location: S Glos, UK
Expire: 2013-11-18
|
 Posted: Thu Oct 22, 2009 5:53 pm Post subject: Adjusting Infinity Focus |
 |
|
martinsmith99 wrote:
I found that one of my wide angled lenses was not reaching infinity so I decided to have a go at fixing it myself. It wasn't an expensive purchase but the lens was in fantastic condition and is quite rare. Many lenses have a similar setup for infinity focus adjustment.
The following details how I set about rectifying the problem. The folloing is for illustration purposes only. I take no responsibility for any damage caused to your equipment. All repairs should be left to an experienced technician.
1. Remove the nameplate by unscrewing it. Often you can unscrew them by using both thumbs pressing in on the nameplate. If they are stiff, there is a rubber tool which can be used.
2. Remove the screws in the coverplate shown here.
3. Set the lens to infinity focus.
4. Slacken, but do not remove the retaining screws shown here. The focus barrel will now move independently of the focus ring (twist the focus ring to check that it is indeed free, as this should now not affect focus).
5. Ensure the focus ring is set to infinity, then twist the barrel a fraction and check focus on a far off subject on the horizon. Tighten one of the retaining screws and recheck focus.
6. Repeat #5 until the sharpest focus is obtained.
7. Reassembly is the reverse of the steps above.
_________________
Casual attendance these days |
|
indianadinos
Joined: 06 Jul 2008
Posts: 1310
Location: Toulouse, France
Expire: 2011-12-05
|
| Posted: Thu Oct 22, 2009 6:29 pm Post subject: |
|
|
indianadinos wrote:
Hi,
This fix works almost the same way for the Super Takumar 24/3.5 (this was my first repair  ) ...
Thanks for sharing the hint.
Cheers
_________________
Please visit my blogs Shooting with a Pentax K10D / FF Visions
Takumar: 24/3.5, 28/3.5, 35/2, 35/3.5, 50/1.4, 55/1.8, 85/1.8, 105/2.8, 120/2.8, 135/3.5, 150/4, 200/4
Pentax-K: M28/2.8, K28/3.5, M50/1.4, A50/1.7, M50/4 Macro, K85/1.8, K105/2.8, K135/2.5, M200/4, M70-150/4
Zeiss: Flektogon 20/2.8, 20/4, 35/2.4, 35/2.8, Tessar 50/2.8, Pancolar 50/1.8, Biotar 58/2, Sonnar 135/3.5, Sonnar 180/2.8
Meyer: Primagon 35/4.5, Domiplan 50/2.8, Oreston 50/1.8, Primoplan 58/1.9, Trioplan 100/2.8, Orestor 100/2.8, Orestor 135/2.8
Schacht/Steinheil: Travenar 90/2.8, Travenon 135/4.5, Quinar 135/2.8, Quinar 135/3.5
Russian: MIR 37B, Industar 50/3.5, Helios 44M & 44M-2, Jupiter 37A
P6: Flektogon 50/4, Biometar 80/2.8, Orestor 300/4
Nikkor: Nikkor-O 35/2, Micro 55/3.5, Nikkor-S 50/1.4, Nikkor-Q 135/2.8
Fuji: EBC 28/3.5, EBC 55/3.5 Macro, EBC 135/2.5
Misc Lenses: Kiron 105/2.8 Macro, Tamron SP90/2.5
... and a few other Vivitar, Tamron, Sigma and Soligor lenses ...
|
|
Excalibur
Joined: 19 Jul 2009
Posts: 5019
Location: UK
Expire: 2014-04-21
|
| Posted: Thu Oct 22, 2009 9:30 pm Post subject: |
|
|
Excalibur wrote:
Excellent, it's so annoying when the sharpest focus is just short of the infinity stop on the lens.
_________________
Canon A1, AV1, T70 & T90, EOS 300 and EOS300v, Chinon CE and CP-7M. Contax 139, Fuji STX-2, Konica Autoreflex TC, FS-1, FT-1, Minolta X-700, X-300, XD-11, SRT101b, Nikon EM, FM, F4, F90X, Olympus OM2, Pentax S3, Spotmatic, Pentax ME super, Praktica TL 5B, & BC1, , Ricoh KR10super, Yashica T5D, Bronica Etrs, Mamiya RB67 pro AND drum roll:- a Sony Nex 3
.........past gear Tele Rolleiflex and Rollei SL66.
Many lenses from good to excellent. |
|
Search
Memberlist
Register
Profile
Log in to check your private messages
Log in
