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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Fri Mar 27, 2015 7:56 am Post subject: Isco Gottingen Westrocolor 1.9/50 - aperture fixed - Samples |
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Oldhand wrote:
Is there some trick to getting the aperture blades to engage on this lens. It is in Exakta mount with the large silver button on the top side.
The aperture ring rotates nicely and makes lovely smooth clicks - but alas no closing of aperture takes place.
Your thoughts are welcome.
So currently it only shoots wide open.
Here is the lens followed by some samples at f1.9
Cheers
OH
Last edited by Oldhand on Wed Apr 01, 2015 8:57 pm; edited 1 time in total |
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Rawit
Joined: 23 Nov 2012 Posts: 39
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Posted: Fri Mar 27, 2015 8:37 am Post subject: |
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Rawit wrote:
The aperture closes when you push the button on the lens. If it doesn't close down, you need to open it up to see what's wrong. _________________ My manual focus lenses: Konica Hexanon 24mm / F2.8 | Vivitar 28mm Close Focus / F2.0 | Konica Hexanon 35mm / F2.0 | Konica Hexanon 50mm / F1.4 | Konica Hexanon 85mm / F1.8 | Konica Hexanon 100mm / F2.8 | Konica Hexanon 135mm / F2.5 |
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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Fri Mar 27, 2015 8:52 am Post subject: |
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Oldhand wrote:
Rawit wrote: |
The aperture closes when you push the button on the lens. If it doesn't close down, you need to open it up to see what's wrong. |
Thank you Rawit - yes that is what I thought happens - but pressing the button has no effect at any aperture.
How difficult is this lens to repair?
OH |
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Rawit
Joined: 23 Nov 2012 Posts: 39
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Posted: Fri Mar 27, 2015 8:57 am Post subject: |
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Rawit wrote:
It's hard to say... I fixed a couple of Domiplans a few years back, only to find out I had 3 different versions with 2 different button configurations. I would start with looking up some guides if available or try to remove the button from the lens to see if what's up with the spring/mechanism. A smooth clicking aperture ring makes me think the problem is with the button. _________________ My manual focus lenses: Konica Hexanon 24mm / F2.8 | Vivitar 28mm Close Focus / F2.0 | Konica Hexanon 35mm / F2.0 | Konica Hexanon 50mm / F1.4 | Konica Hexanon 85mm / F1.8 | Konica Hexanon 100mm / F2.8 | Konica Hexanon 135mm / F2.5 |
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Minolfan
Joined: 30 Dec 2008 Posts: 3438 Location: Netherlands
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Posted: Fri Mar 27, 2015 9:40 am Post subject: |
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Minolfan wrote:
A nice clicking ring is very well possible when rhe aperture blades are sticking in WO position as they have become smeared by oil from the mechanism. Probably you have te clean the blades. In most Exakta lenses (not the Domiplan) the outside button construction is rather solid; space enough for that!
Your nice pictures proof IMHO rhat the lens is worth the effort |
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mo
Joined: 27 Aug 2009 Posts: 8979 Location: Australia
Expire: 2016-07-30
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Posted: Fri Mar 27, 2015 10:16 am Post subject: |
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mo wrote:
Does the large silver button turn like a screw to open and screw to close, then it opens and closes the aperture? _________________ Moira, Moderator
Fuji XE-1,Pentax K-01,Panasonic G1,Panasonic G5,Pentax MX
Ricoh Singlex TLS,KR-5,KR-5Super,XR-10
Lenses
Auto Rikenon's 55/1.4, 1.8, 2.8... 50/1.7 Takumar 2/58 Preset Takumar 2.8/105 Auto Takumar 2.2/55, 3.5/35 Super Takumar 1.8/55...Macro Takumar F4/50... CZJ Biotar ALU M42 2/58 CZJ Tessar ALU M42 2.8/50
CZJ DDR Flektogon Zebra M42 2.8/35 CZJ Pancolar M42 2/50 CZJ Pancolar Exakta 2/50
Auto Mamiya/Sekor 1.8/55 ...Auto Mamiya/Sekor 2/50 Auto Mamiya/Sekor 2.8/50 Auto Mamiya/Sekor 200/3.5 Tamron SP500/8 Tamron SP350/5.6 Tamron SP90/2.5
Primoplan 1.9/58 Primagon 4.5/35 Telemegor 5.5/150 Angenieux 3.5/28 Angenieux 3,5/135 Y 2
Canon FL 58/1.2,Canon FL85/1.8,Canon FL 100/3.5,Canon SSC 2.8/100 ,Konica AR 100/2.8, Nikkor P 105/2.5
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Minolfan
Joined: 30 Dec 2008 Posts: 3438 Location: Netherlands
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Posted: Fri Mar 27, 2015 10:59 am Post subject: |
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Minolfan wrote:
You are right Mo, I forgot that the release and aperture can be blocked by turning the knob of most of these lenses
That would be the easiest solution, just by turning that button. |
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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Fri Mar 27, 2015 11:45 am Post subject: |
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Oldhand wrote:
Thank you both for your replies.
Yes, the knob when depressed acts like a cam which activates a lever which should close the aperture.
If the knob is rotated when depressed, it closes the aperture and keeps it closed at whatever f stop is chosen in the aperture ring.
Sadly on mine - nothing happens within the lens even though the knob and lever are working.
Perhaps there is a missing linkage inside the lens or the aperture blades are stuck.
Cheers
OH |
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Lightshow
Joined: 04 Nov 2011 Posts: 3666 Location: Calgary
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Posted: Fri Mar 27, 2015 6:48 pm Post subject: |
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Lightshow wrote:
Likely needs to be cleaned, good luck. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Sun Mar 29, 2015 9:04 am Post subject: |
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Oldhand wrote:
Lightshow wrote: |
Likely needs to be cleaned, good luck. |
Yep, either that or a linkage is unattached.
Here are a couple of quickies from this afternoon - wide open of course.
OH
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BeardsAreBest
Joined: 09 May 2014 Posts: 286 Location: Australia
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Posted: Mon Mar 30, 2015 10:26 am Post subject: |
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BeardsAreBest wrote:
If he lets me in there after my failure with a certain 57mm 1.4 of mine. Hmmmmm...??
A learning experience, none the less.
Very nice shots oldmate by the way |
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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Wed Apr 01, 2015 1:09 am Post subject: |
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Oldhand wrote:
My amazing son - BeardsAreBest - has taken my Isco Gottingen Westrocolor and repaired the aperture mechanism for me.
It not only shoots wide open, but now has a usable set of aperture stops.
I immediately took it outside to give it a burl.
Here are some quick images from f/1.9 through to f/16.
There is an increase in acuity from f/1.9 through to f/8, with diffraction kicking in at f/16
Again - no PP except change from RAW to .jpeg
So - here we go:
@f/1.9
@ f/4
@f/8
@f/16 and diffraction is starting to soften the image a little
I can't help thinking of the often repeated statement that Isco were second quality Schneiders.
I see nothing but quality here.
Cheers
OH |
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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Wed Apr 01, 2015 3:19 am Post subject: |
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Oldhand wrote:
And here is the lens sporting its newly activated and cleaned aperture blades.
OH
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Minolfan
Joined: 30 Dec 2008 Posts: 3438 Location: Netherlands
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Posted: Wed Apr 01, 2015 4:04 pm Post subject: |
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Minolfan wrote:
Congrats with the working lens and with a son that handy! |
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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Wed Apr 01, 2015 8:48 pm Post subject: |
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Oldhand wrote:
The definition in images continues to surprise me with this wonderful lens.
OH
taken at f/4
Crop of above:
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Lightshow
Joined: 04 Nov 2011 Posts: 3666 Location: Calgary
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Posted: Wed Apr 01, 2015 9:12 pm Post subject: |
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Lightshow wrote:
Image quality is above average, I wish more lenses were this good. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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Nordentro
Joined: 24 Jun 2010 Posts: 4713 Location: Lillehammer, Norway
Expire: 2015-01-29
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Posted: Wed Apr 01, 2015 10:22 pm Post subject: |
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Nordentro wrote:
Nice results indeed. I have this lens to, but different visual design. I would still guess that the lens design is equal.
_________________ Lars | Manuellfokus.no |
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Oldhand
Joined: 01 Apr 2013 Posts: 6000 Location: Mid North Coast NSW - Australia
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Posted: Wed Apr 01, 2015 10:35 pm Post subject: |
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Oldhand wrote:
Thank you both.
I think that your lens looks prettier than mine Nordentro
I hope that your results are as good as I am getting (not boasting - just enormously happy with them)
OH |
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