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essessem
Joined: 19 Feb 2003 Posts: 48 Location: California
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Posted: Sun Dec 19, 2010 6:46 pm Post subject: Ektar 203mm is "soft focus" |
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Hi all,
Bench testing reveals that my lens (in Flash Supermatic) probably has either a different front or rear lens element from the factory original, or else the hack CLA guy from a couple years ago messed up something. Either way I've got a lens with legendary sharpness acting somewhat better than a Holga. I was told that sellers will swap out a scratchy lens element with one from another lens to make it cosmetically more appealing. eBuyer beware! The embarrassing thing is, I've been shooting with it thinking that was the 'look' it had.
I put in a request to SK Grimes to see if they can realign the lens elements to spec--reply is pending. Anyone in the graflexsphere have suggestions for repairfolk who can do this? _________________ Speak softly and carry a big camera. |
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Henry
Joined: 09 May 2001 Posts: 1636 Location: Allentown, Pennsylvania
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Posted: Sun Dec 19, 2010 7:08 pm Post subject: |
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This is the main reason that I have removed and retained the front and rear lens elements whenever I have sent a shutter out for repairs. There's no reason for the technician to mess with the lenses when it's only the shutter that needs attention, and besides, the shipping weight is (marginally slightly) less. And the presence or absence of the lenses should not affect the performance of the shutter. Of course, the preceding doesn't apply if there is indeed a lens problem. |
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Les
Joined: 09 May 2001 Posts: 2682 Location: Detroit, MI
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Posted: Sun Dec 19, 2010 7:35 pm Post subject: |
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SK Grimes (and in particular the late Steve Grimes) knew more about lenses and lens mounting than I did and I wouldn't begin to tell them what to do.
From a practical point of view all they really can do is bench test it and move some elements around (there are no cemented elements in a 203 Ektar) Anything beyond that would exceed the cost of the lens.
I suppose it's possible that it was a special lens. Ken Hough told me he found a Protar one time that wouldn't perform at all, and upon disassembly found there was a close up lens element cemented to the front of the lens. The original owner must have ordered it for ordered it for copy work. _________________ "In order to invent, you need a good imagination and a lot of junk" Thomas Edison |
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45PSS
Joined: 28 Sep 2001 Posts: 4081 Location: Mid Peninsula, Ca.
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Posted: Sun Dec 19, 2010 9:49 pm Post subject: |
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Got a caliper?
http://www.cameraeccentric.com/html/info/kodak_4.html
Catalog Page 61, light travels the direction of the arrow.
I have not disassembled the groups on mine.
Front edge of front group barrel to rear edge of front group element: .4575 inch. Front barrel edge to rear of barrel thread edge: .4025 inch. Front barrel edge to outer edge of front element: .1325 inch. Rear edge of front group rear element to rear edge of shutter blade: .271 inch with group snug in shutter.
Rear barrel outer edge to inner element outer edge: .471 inch. Barrel outer edge to thread base outer edge: .415 inch. Rear outer barrel edge to front edge of the element at the outer edge: .132 inch. Shutter blade front edge to rear group front element .1555 inch.
Both groups installed on shutter, front to rear: 1.257 inches. Rear group removed, front to shutter mount rear: 1.044 inch. Both groups removed, shutter mount to shutter mount: .809 inch. Rear group to shutter mount front: 1.022 inch.
My digital caliper is accurate to 3 decimal places and toggles from 0 to 5 in the 4th decimal position.
Flash Supermatic M-F shutter. When press to focus button is engaged at T edge of shutter blade is just visible at the outer edge of the opening. Base of caliper set to just touch the blade at the edge with the center just touching the glass with the caliper perpendicular to the shutter. _________________ The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU. |
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essessem
Joined: 19 Feb 2003 Posts: 48 Location: California
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Posted: Mon Dec 20, 2010 11:14 pm Post subject: |
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Thanks for the replies. The latest is that SK Grimes isn't set up to correct lenses. So short of any techie recommendations, I'll give it a go when the camera is back from the repairman. What have I got to lose?
@Charles: As always, you're a wealth of knowledge and one of the best resources on this site. Once I get the lens in hand I'll likely have some questions for you. I indeed have a digital caliper. (One thing that comes to mind is how to measure lens elements mounted in a shutter.)
Hope everyone's holiday is sharp and contrasty! _________________ Speak softly and carry a big camera. |
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1banjo
Joined: 16 Nov 2008 Posts: 492 Location: kansas
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Posted: Tue Dec 21, 2010 3:49 am Post subject: |
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hey all
I don't have an older shutterbug they had an add of a shop in Denver CO.
that done lens repair like even new coating on old lens
So if some one has a shutterbug you mite take a look and see if its in there
banjo |
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alecj
Joined: 09 May 2001 Posts: 853 Location: Alabama
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Posted: Sat Jan 01, 2011 3:47 pm Post subject: |
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That would be Focal Point, Inc. They do wonderful work. I had a scratch on a front element of a Hassy lens polished out, and the multi-coating replaced. If it means a lot, try them. |
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1banjo
Joined: 16 Nov 2008 Posts: 492 Location: kansas
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Posted: Sat Jan 01, 2011 7:21 pm Post subject: |
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Yes that then ! Focal Point Inc. 303-665-6640 john@focalpointlens.com
at the time I thank that I was talking to a Mat BUT that was 20 years ago
Banjo |
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essessem
Joined: 19 Feb 2003 Posts: 48 Location: California
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Posted: Sun Jan 09, 2011 12:14 am Post subject: |
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Sorry I haven't checked in for a while. I'll definitely be contacting Focal Point this week. I miked the lens and came up with some slight and not-so-slight differences from Charles' figures. I figure there was some difference between lenses due to manufacturing variables. FWIW, my lens is from 1948. Thanks all, and I'll keep you updated. _________________ Speak softly and carry a big camera. |
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