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Sven
Joined: 02 Aug 2008
Posts: 818
Location: Linköping Sweden
Expire: 2011-12-29
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 Posted: Tue Nov 11, 2008 7:59 pm Post subject: Odd Lens |
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Sven wrote:
I happened to spot a lens-like object in a bin for electronics trash at work. It's not normally what I would expect to see there so I couldn't resist picking it up.
I'm pretty sure it's a complete lens since it was attached to an old fashioned TV camera tube (Vidicon).
It's fixed focus (wide open) and no iris. The back focus seems to be very short as well.
By adding some adhesive tape on the barrel, I was able to fit it in to an M42 adapter and could try it on both DSLRs. So far I haven't been able to get a sharp image out of it. It's terrible on the Nikon and slightly better on the Pentax.
My guess is that it's set to focus on infinity and it seems to be a short telephoto in the 135 - 200mm area. The bokeh seems fine, the only problem is that it's all over the picture.
No manufacturer name or lens data.
Any idea what it could be?
On the Nikon
On the Pentax
_________________
DSLR: Nikon D200, Pentax *istDL, Nikon D100 IR converted
SLR: Pentax Spotmatic, Pentax ME,
Nikkor:N 2.8/24 H 3.5/28, 2/35, 2/50, 1.4/50 1.8/85, 3.5/50-135, E 2.8/100, P C 2.5/105, 2.8/135, 2.8/180 ED, 4/200,
M42: Pentacon 4/200, S Takumar 1.8/55, Meyer Orestor 2.8/135, CZJ Flektogon 2.4/35, CZJ Pancolar 1.8/50, CZJ Sonnar 3.5/135
AF Lenses: Nikkor 1.8/50, Pentax 18-55
Flickr http://www.flickr.com/photos/29261959@N08/
Website http://www.hundbilder.nu/ |
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Arlon
Joined: 08 Aug 2008
Posts: 188
Location: http://www.pbase.com/arlon
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| Posted: Tue Nov 11, 2008 9:18 pm Post subject: |
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Arlon wrote:
I like the dog pic. Just a little more contrast maybe. That "soft" look is hard to get. People pay a lot of money for a "soft focus" lens. Hard to get a natural softness like that in pp. I think I'd work with it a little more and see what you can do with it.
Curious why there was that much difference between the cameras unless it was more from lens position..
_________________
D800E, D700, D90, D50, F2, D100 (IR converted)
Stolen: D200 , D70 (IR converted)
Big box of MF lenses from 15mm to 600mm..
Favorites are the micro nikkors (55mm, 105mm and 200mm). |
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Sven
Joined: 02 Aug 2008
Posts: 818
Location: Linköping Sweden
Expire: 2011-12-29
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| Posted: Tue Nov 11, 2008 9:37 pm Post subject: |
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Sven wrote:
A bit more contrast with the help of PS. It came out quite low in contrast so I wanted to show it like that.
The difference between the cameras could perhaps be because the lens is operating further away from it's intended position vs the image plane on the Nikon.
I will try it out a bit more and perhaps try to stop it down a bit with a disc if that proves possible.
_________________
DSLR: Nikon D200, Pentax *istDL, Nikon D100 IR converted
SLR: Pentax Spotmatic, Pentax ME,
Nikkor:N 2.8/24 H 3.5/28, 2/35, 2/50, 1.4/50 1.8/85, 3.5/50-135, E 2.8/100, P C 2.5/105, 2.8/135, 2.8/180 ED, 4/200,
M42: Pentacon 4/200, S Takumar 1.8/55, Meyer Orestor 2.8/135, CZJ Flektogon 2.4/35, CZJ Pancolar 1.8/50, CZJ Sonnar 3.5/135
AF Lenses: Nikkor 1.8/50, Pentax 18-55
Flickr http://www.flickr.com/photos/29261959@N08/
Website http://www.hundbilder.nu/ |
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Rusty
Joined: 06 Nov 2008
Posts: 435
Location: Mosselbay, South Africa
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| Posted: Thu Nov 13, 2008 3:12 pm Post subject: |
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Rusty wrote:
Maybe some type of 1.5 or 2times extender ?
I have a canon moviecam 1.5x extender that is exactly the same type of construction but for the screwmount at the back
normaly if you can look through it with your bare eye and see a focused picture through it with the one eye that is slightly bigger than with the other eye it is an extender (looking through a lens normally a focused picture is not possible) |
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Sven
Joined: 02 Aug 2008
Posts: 818
Location: Linköping Sweden
Expire: 2011-12-29
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| Posted: Thu Nov 13, 2008 7:13 pm Post subject: |
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Sven wrote:
| Rusty wrote: |
Maybe some type of 1.5 or 2times extender ?
I have a canon moviecam 1.5x extender that is exactly the same type of construction but for the screwmount at the back
normaly if you can look through it with your bare eye and see a focused picture through it with the one eye that is slightly bigger than with the other eye it is an extender (looking through a lens normally a focused picture is not possible) |
If I look through it with my eye it's only sharp at close distance (like a magnifying glass). I'm not sure if that is consistent with the extender theory.
I tried to stop it down by putting in a circular disc with a smaller opening and that enhanced the sharpness. Still not exactly Carl Zeiss but sharper at least.
_________________
DSLR: Nikon D200, Pentax *istDL, Nikon D100 IR converted
SLR: Pentax Spotmatic, Pentax ME,
Nikkor:N 2.8/24 H 3.5/28, 2/35, 2/50, 1.4/50 1.8/85, 3.5/50-135, E 2.8/100, P C 2.5/105, 2.8/135, 2.8/180 ED, 4/200,
M42: Pentacon 4/200, S Takumar 1.8/55, Meyer Orestor 2.8/135, CZJ Flektogon 2.4/35, CZJ Pancolar 1.8/50, CZJ Sonnar 3.5/135
AF Lenses: Nikkor 1.8/50, Pentax 18-55
Flickr http://www.flickr.com/photos/29261959@N08/
Website http://www.hundbilder.nu/ |
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