| View previous topic :: View next topic |
| Author |
Message |
Mos6502
Joined: 20 Jun 2011
Posts: 961
Location: Austin
|
 Posted: Fri Aug 09, 2013 9:05 pm Post subject: Who can remove damaged coating? |
 |
|
Mos6502 wrote:
I found a great Schacht Travegon except that it suffers from bad coating on the front element (a very common problem with Schacht lenses). I want to know if anybody has had experience removing this or knows of a shop (in the U.S.) that can remove it. The rest of the lens is in excellent condition but the spotty coating ruins the contrast.
Any suggestions appreciated.
Thanks! |
|
| Back to top |
|
 |
Attila
Joined: 24 Feb 2007
Posts: 57939
Location: Hungary
Expire: 2021-11-18
|
| Posted: Fri Aug 09, 2013 10:03 pm Post subject: |
|
|
Attila wrote:
Even if you will remove coating "no coating" will also not improve contrast left as is and fix contrast in post process.
_________________
-------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
|
|
| Back to top |
|
|
ZoneV
Joined: 09 Nov 2009
Posts: 1648
Location: Germany
Expire: 2011-12-02
|
| Posted: Fri Aug 09, 2013 10:59 pm Post subject: |
|
|
ZoneV wrote:
I have removed lens coating on several lenses.
Front lens front coating gets a bit better light transmittance into the lens. But without this coating the more back reflected light is away in the enviroment - no problem as long you don´t use filters.
Lens surfaces inside the lens and camera should be coated, because reflections will reflect back, scatter and make contrast worse.
Probably the lens has haze inside?
_________________
Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
|
|
| Back to top |
|
|
Mos6502
Joined: 20 Jun 2011
Posts: 961
Location: Austin
|
| Posted: Fri Aug 09, 2013 11:42 pm Post subject: |
|
|
Mos6502 wrote:
No haze. Just coating damage and some cleaning marks on the front lens. The rest of the glass is excellent. The effect of the damaged coating is a lot like having a bunch of fingerprints on the glass, except you cannot clean it off. This seems to be a common problem with older Schacht lenses, I've not seen it on any other lenses except Ricoh lenses from the same era. |
|
| Back to top |
|
|
Mos6502
Joined: 20 Jun 2011
Posts: 961
Location: Austin
|
| Posted: Sat Aug 10, 2013 10:12 am Post subject: |
|
|
Mos6502 wrote:
I took the lens apart to check for other problems, but the glass inside is perfectly clean. There isn't even any internal dust. It's spotless. I discovered though that the auto-aperture mechanism uses a graphite lubricant, and I think this may be the source of the coating damage on the front element. The back side of the front element is also in perfect shape. The only problem is the coating on the front. I hope there is a gentle way to remove this. |
|
| Back to top |
|
|
ZoneV
Joined: 09 Nov 2009
Posts: 1648
Location: Germany
Expire: 2011-12-02
|
| Posted: Sat Aug 10, 2013 7:23 pm Post subject: |
|
|
ZoneV wrote:
I think that removing the front coating doens not help the lens-contrast. Probably the lens has not that contrast like newer lenses.
_________________
Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
|
|
| Back to top |
|
|
Mos6502
Joined: 20 Jun 2011
Posts: 961
Location: Austin
|
| Posted: Sat Aug 10, 2013 7:59 pm Post subject: |
|
|
Mos6502 wrote:
I'm pretty sure I'm not imagining things. 
The travegon is known for being pretty punchy, and this one flares pretty bad/lacks contrast. |
|
| Back to top |
|
|
|
|
|
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
|
Search
Memberlist
Register
Profile
Log in to check your private messages
Log in
