| View previous topic :: View next topic |
| Author |
Message |
shauttra
Joined: 17 Nov 2009
Posts: 778
Location: Latvia
|
 Posted: Thu Feb 18, 2010 7:07 pm Post subject: MTO-1000 problem in winter |
 |
|
shauttra wrote:
My MTO-1000 is making blurry image in cold weather (below 0 degrees), even after one hour cooling. Other mirror lens MTO-500 works fine even at -25 degrees below zero.
what do I do? 
_________________
Mto-1000, Tair-3, Auto Exaktar 135mm 2,8, Samyang 14mm 2.8,
Jupiter 37A, Carl Zeiss Sonnar 135/3.5,
Helios-44, Mir-1, Revuenon 50/1.4,
Carl Zeiss Pancolar 50/1.8, Samyang 24/1.4, Auto Vivitar 35/2.8
www.radosi.lv
http://shauttra.blogspot.com |
|
| Back to top |
|
 |
CarbonR
Joined: 31 Dec 2008
Posts: 1969
Location: Clermont-Ferrand, France
|
| Posted: Thu Feb 18, 2010 7:52 pm Post subject: |
|
|
CarbonR wrote:
Going to a warmer country ? 
_________________
Cameras : Canon 5D, Pentax K100D, Pentax 6x7, Spotmatic
Lenses : 15mm to 1000mm (24x36)
My websites : [FR & ENG]Takumar - the eyes of the Spotmatic : info about all Takumar lenses // Kogaku - My photo site
I am selling : Takumar lenses and rare Pentax bodies, pm me if you're interested in something [MFLenses feed-back]
Information on Takumar lenses with samples :
Wide angle : Takumar 15/3.5 15mm, Takumar 17/4 17mm, Takumar 18/11 18mm, Takumar 20/4.5 20mm, Takumar 24/3.5 24mm, Takumar 28/3.5 V1 28mm, Takumar 28/3.5 V2 28mm, Takumar 35/2 V1 35mm, Takumar 35/2 V2 35mm, Takumar 35/2.3 35mm, Takumar 35/3.5 35mm, Takumar 35/4 35mm
Standard : Takumar 50/1.4 V1 50mm, Takumar 50/1.4 V2 50mm, Takumar 50/3.5 50mm, Takumar 50/4 50mm, Takumar 55/2 55/1.8 55mm, Takumar 55/2.2 V1 55mm, Takumar 55/2.2 V2 55mm, Takumar 58/2 58mm, Takumar 58/2.4 58mm
Short tele : Takumar 83/1.9 83mm, Takumar 85/1.8 85/1.9 85mm, Takumar 85/1.8 85mm, Takumar 100/2 100mm, Takumar 100/3.5 100mm, Takumar 100/4 100mm, Takumar 105/2.8 V1 105mm, Takumar 105/2.8 V2 105mm, Takumar 120/2.8 120mm
Telephoto : Takumar 135/2.5 V1 135mm, Takumar 135/2.5 V2 135mm, Takumar 135/3.5 V1 135mm, Takumar 135/3.5 V2 135mm, Takumar 150/4 V1 150mm, Takumar 150/4 V2 150mm
Long tele : Takumar 200/3.5 200mm, Takumar 200/4 200mm, Takumar 200/5.6 200mm, Takumar 300/4 V1 300mm, Takumar 300/4 V2 300mm, Takumar 300/4 V3 300mm, Takumar 300/6.3 300mm, Takumar 400/5.6 400mm, Takumar 500/4.5 500mm, Takumar 500/5 500mm, Takumar 1000/8 V1 1000mm, Takumar 1000/8 V2 1000mm
Zoom : Zoom-Takumar 45~125/4 , Zoom-Takumar 70~150/4.5 , Zoom-Takumar 85~210/4.5 , Zoom-Takumar 135~600/6.7
Achromatic : Ultra-Achromatic-Takumar 85/4.5 , Ultra-Achromatic-Takumar 300/5.6 300mm |
|
| Back to top |
|
|
shauttra
Joined: 17 Nov 2009
Posts: 778
Location: Latvia
|
| Posted: Thu Feb 18, 2010 7:56 pm Post subject: |
|
|
shauttra wrote:
Hm, but if i like Canada? 
_________________
Mto-1000, Tair-3, Auto Exaktar 135mm 2,8, Samyang 14mm 2.8,
Jupiter 37A, Carl Zeiss Sonnar 135/3.5,
Helios-44, Mir-1, Revuenon 50/1.4,
Carl Zeiss Pancolar 50/1.8, Samyang 24/1.4, Auto Vivitar 35/2.8
www.radosi.lv
http://shauttra.blogspot.com |
|
| Back to top |
|
|
JWH
Joined: 26 Aug 2009
Posts: 120
Location: Netherlands
|
| Posted: Thu Feb 18, 2010 8:22 pm Post subject: |
|
|
JWH wrote:
That's quite common for mirror lenses, especially on telescopes. I can take my refractor telescope out and almost observe instantly, but my mirror scope needs atleast 1 hour prior to observing. That's a Newton scope so it has an open construction at the front and cools quicker than a closer Maksutov design like the MTO. |
|
| Back to top |
|
|
shauttra
Joined: 17 Nov 2009
Posts: 778
Location: Latvia
|
| Posted: Thu Feb 18, 2010 8:29 pm Post subject: |
|
|
shauttra wrote:
So you think i need to try to cool lens for a longer time?
Maybe when i focusing, and touching the lens one side is warmer than other, and there is some temperature difference?
_________________
Mto-1000, Tair-3, Auto Exaktar 135mm 2,8, Samyang 14mm 2.8,
Jupiter 37A, Carl Zeiss Sonnar 135/3.5,
Helios-44, Mir-1, Revuenon 50/1.4,
Carl Zeiss Pancolar 50/1.8, Samyang 24/1.4, Auto Vivitar 35/2.8
www.radosi.lv
http://shauttra.blogspot.com |
|
| Back to top |
|
|
pat donnelly
Joined: 19 Jan 2010
Posts: 666
Location: Brisbane, Australia
|
| Posted: Fri Feb 19, 2010 5:25 am Post subject: Never encoutered this problem, myself |
|
|
pat donnelly wrote:
Physics suggests that cooling too quickly will cause problems with metal and glass, distorting or permanently damaging. I am sure that you will not stress the lens too much, by taking care?
There may be trapped moisture inside and this will, when cooled, fall as rain within the lens, leaving beads of "condensation" which will each act as a microlens, distorting the image and if fine enough, it will appear as "cloudy".
I suggest drying out the lens by putting in an air tight container with lots of cat litter, aka silicate, or even salt or sugar, in a breathable but restraining container inside the container, to suck in the moisture from the lens. This might take a day or two? Discard or microwave the dessicant and repeat as required.
Let us know how you get on?
_________________
---------------------------------
EP-1, E-410, E-300, D100, D1,
C-Mt: 25mm 1.9, 75mm 1.4, 75mm 1.3, 75mm 1.9, Ultra wides, one inch sensor, 20+ c-mount zooms
OM 350mm f2.8, Nikkor 180 f2.8, Exa 180 f2.8,
Tamrons: 90mm f2.5, 500mm f8 x3, 135 f2.5, 200 f3.5, 24mm 2.5, 28mm 2.5 x8,
FD 500mm mirror lens |
|
| Back to top |
|
|
shauttra
Joined: 17 Nov 2009
Posts: 778
Location: Latvia
|
| Posted: Fri Feb 19, 2010 5:49 am Post subject: |
|
|
shauttra wrote:
Thanks pat donnelly!!
Yes indeed i have condensate inside!!
I will try to do something!!
Thanks!
_________________
Mto-1000, Tair-3, Auto Exaktar 135mm 2,8, Samyang 14mm 2.8,
Jupiter 37A, Carl Zeiss Sonnar 135/3.5,
Helios-44, Mir-1, Revuenon 50/1.4,
Carl Zeiss Pancolar 50/1.8, Samyang 24/1.4, Auto Vivitar 35/2.8
www.radosi.lv
http://shauttra.blogspot.com |
|
| Back to top |
|
|
aoleg
Joined: 22 Feb 2008
Posts: 1387
Location: Berlin, DE
|
| Posted: Fri Feb 19, 2010 6:18 am Post subject: |
|
|
aoleg wrote:
| shauttra wrote: |
So you think i need to try to cool lens for a longer time?
Maybe when i focusing, and touching the lens one side is warmer than other, and there is some temperature difference? |
I doubt that. Maybe it's just not made for low temperatures. You know, glass and metal contracting at different rates thus deforming the primary mirror out of shape. These mirrors are very easy to get deformed, and the 1000mm focal length exaggerates any imperfections in their shape.
_________________
List of lenses |
|
| Back to top |
|
|
Yvan
Joined: 28 Feb 2010
Posts: 4
Location: Belgium
|
| Posted: Sun Feb 28, 2010 9:33 am Post subject: |
|
|
Yvan wrote:
Hi all, I'm new here.
My MTO-11CA needs to cool down for some 3hrs in temperatures below 0°C.
To prevent it from cooling down too suddenly, especially when there is wind, I cover it loosely with a plastic garbage bag.
My lens had what appeared to be condensation on the large mirror. After closer examination it turned out to be a film of tiny oil or grease droplets.
After I cleaned the mirror (very gently using isopropyl alcohol reagent grade) it performed a lot better.
Yvan. |
|
| 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
