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blotafton
Joined: 08 Aug 2013 Posts: 1554 Location: Sweden
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Posted: Tue Aug 27, 2013 6:56 pm Post subject: Chiyoko p-rokkor 2.5/75 |
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blotafton wrote:
Hello!
First image post, lets see if it gets stuck in the anti spam.
I'll share some pics from a Rokkor lens that haven't been tested much. It's a projector lens that can be found on the cute Minolta Mini 35 slide projector. I have simply removed the lens in a non destructive manner and slapped it on an m42 bellows. To make a snug fit I put some duct tape around the barrel and that’s it!
There are at least two versions of this lens, the probably older alu version and a black one with different barrel. I got them both, for good measure. I think it's a triplet design.
With my eos 40d it can focus to about 2.5 meters give or take. Not reaching infinity hasn’t bothered me much.
First a few wide open shots at f2.5, with added duct tape lens hood. Contrast suffers heavily without the hood.
As you can clearly see there isn't much sharpness wide open. I was really curious about stopped down image quality so first I took a piece of paper with something like a f/5.6-7 aperture hole in it. You can see on the first of the following images that bokeh wasn't that good so I made a new wooden aperture, a slice of wood with a drilled hole, taped to the back of the lens. Better bokeh if you ask me.
crop
Cardinal beetle
Beautiful coating
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caspert79
Joined: 31 Oct 2010 Posts: 2926 Location: The Netherlands
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Posted: Tue Aug 27, 2013 7:03 pm Post subject: |
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caspert79 wrote:
Amazing, that's definately an upgrade! |
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Attila
Joined: 24 Feb 2007 Posts: 57849 Location: Hungary
Expire: 2025-11-18
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Posted: Tue Aug 27, 2013 8:46 pm Post subject: |
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Attila wrote:
Beautiful pictures, thank you! Lens taken from what equipment ? _________________ -------------------------------
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
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blotafton
Joined: 08 Aug 2013 Posts: 1554 Location: Sweden
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Posted: Tue Aug 27, 2013 9:11 pm Post subject: |
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blotafton wrote:
caspert79 wrote: |
Amazing, that's definitely an upgrade! |
Certainly smother than the first try!
Attila wrote: |
Beautiful pictures, thank you! Lens taken from what equipment ? |
The pleasure is mine! The lens belongs to the Minolta Mini 35 slide projector. |
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espirit
Joined: 08 Nov 2010 Posts: 12
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Posted: Sat Jul 30, 2016 2:56 am Post subject: |
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espirit wrote:
Hello Guys, Sorry revive the topic.
I found here in Brazil, one minolta 35 mini projector, but the lens is not this model, has not Chiyoko name, just Rokkor P 75 2.5, is it the same optical / project with similar results? I'm afraid to buy if you do not have the same result in bokeh. |
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kds315*
Joined: 12 Mar 2008 Posts: 16544 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Sat Jul 30, 2016 7:31 am Post subject: |
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kds315* wrote:
espirit wrote: |
Hello Guys, Sorry revive the topic.
I found here in Brazil, one minolta 35 mini projector, but the lens is not this model, has not Chiyoko name, just Rokkor P 75 2.5, is it the same optical / project with similar results? I'm afraid to buy if you do not have the same result in bokeh. |
It is the same, just late one _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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espirit
Joined: 08 Nov 2010 Posts: 12
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Posted: Sat Jul 30, 2016 7:48 am Post subject: |
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espirit wrote:
Thanks Klaus,
best regards |
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Raxar
Joined: 25 Mar 2014 Posts: 222
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Posted: Sat Jul 30, 2016 2:26 pm Post subject: |
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Raxar wrote:
espirit wrote: |
Hello Guys, Sorry revive the topic.
I found here in Brazil, one minolta 35 mini projector, but the lens is not this model, has not Chiyoko name, just Rokkor P 75 2.5, is it the same optical / project with similar results? I'm afraid to buy if you do not have the same result in bokeh. |
I have this one:
and the lens is nothing like the older version! it glow like hell and has a lot of coma and other abrasion and very low contrast! the center sharpness is OK but i mean center! 2px left and right from center are became horrible (FC problem i guess) but beside all of those negative sides it has most unique bokeh!
(obviously all image has some degree of PP)
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espirit
Joined: 08 Nov 2010 Posts: 12
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Posted: Sat Jul 30, 2016 5:01 pm Post subject: |
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espirit wrote:
Thanks Raxar,
then, I will continue looking for the old version.
Best Regards |
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blotafton
Joined: 08 Aug 2013 Posts: 1554 Location: Sweden
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Posted: Sun Jul 31, 2016 5:16 pm Post subject: |
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blotafton wrote:
[quote="Raxar"]
espirit wrote: |
Hello Guys, Sorry revive the topic.
I found here in Brazil, one minolta 35 mini projector, but the lens is not this model, has not Chiyoko name, just Rokkor P 75 2.5, is it the same optical / project with similar results? I'm afraid to buy if you do not have the same result in bokeh. |
Quote: |
I have this one:
and the lens is nothing like the older version! it glow like hell and has a lot of coma and other abrasion and very low contrast! the center sharpness is OK but i mean center! 2px left and right from center are became horrible (FC problem i guess) but beside all of those negative sides it has most unique bokeh!
(obviously all image has some degree of PP) |
It looks like you have the lens mounted the wrong way
In this thread, I tested Staeble Werk projector lens and it looks similar to your pictures when reverse-mounted.
http://forum.mflenses.com/viewtopic.php?t=75105&view=previous |
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calvin83
Joined: 12 Apr 2009 Posts: 7554 Location: Hong Kong
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Posted: Sun Jul 31, 2016 6:08 pm Post subject: |
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calvin83 wrote:
+1. There is no reason Minolta will make a lens in such low quality. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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Raxar
Joined: 25 Mar 2014 Posts: 222
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Posted: Sun Jul 31, 2016 7:09 pm Post subject: |
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Raxar wrote:
it cant be mounted in the reverse because it has fixed helicoid so may be minolta mounted it in the wrong way
thats the mounting situation:
I'll try to monut it in other way and also use lens hood and it didn't get any better: (setup + reverse and normal)
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calvin83
Joined: 12 Apr 2009 Posts: 7554 Location: Hong Kong
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Posted: Sun Jul 31, 2016 7:35 pm Post subject: |
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calvin83 wrote:
This lens is a triplet. It may be the middle element was reversed but I am not sure. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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blotafton
Joined: 08 Aug 2013 Posts: 1554 Location: Sweden
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Posted: Sun Jul 31, 2016 9:33 pm Post subject: |
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blotafton wrote:
Raxar wrote: |
I'll try to monut it in other way and also use lens hood and it didn't get any better: (setup + reverse and normal)
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Oh, in that case it's strange. Might be as calvin said.
Since I have both the black and silver version I'll compare them side by side.
By the way the first image of your screen looks better on the edges. |
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Raxar
Joined: 25 Mar 2014 Posts: 222
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Posted: Sun Jul 31, 2016 11:56 pm Post subject: |
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Raxar wrote:
calvin83 wrote: |
This lens is a triplet. It may be the middle element was reversed but I am not sure. |
you are absolutely right about something wrong with the elements!
it wasnt the 2nd element but it was the spacer between 1st and 2nd! when i try to open the lens the edge of first and second elements are shattered some idiot place both spacer between 2nd and 3rd and screw the helicoid bolt on them re-arranged them and its now comparable to the other 75/2.5
focus is on the left side
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calvin83
Joined: 12 Apr 2009 Posts: 7554 Location: Hong Kong
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Posted: Mon Aug 01, 2016 3:03 am Post subject: |
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calvin83 wrote:
Good to hear you solved the problem. _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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Blazer0ne
Joined: 12 Sep 2018 Posts: 836
Expire: 2024-12-07
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Posted: Fri May 24, 2019 2:37 pm Post subject: |
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Blazer0ne wrote:
... |
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