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jamaeolus
Joined: 19 Mar 2014
Posts: 2931
Location: Eugene
Expire: 2015-08-20
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 Posted: Fri Nov 13, 2020 3:41 pm Post subject: Kowa Prominar 5 inch f2 on a7rii |
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jamaeolus wrote:
This project was inspired by the ongoing projection lens adaptation displays by the community.
First the lens and camera:
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jamaeolus
Joined: 19 Mar 2014
Posts: 2931
Location: Eugene
Expire: 2015-08-20
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| Posted: Fri Nov 13, 2020 5:06 pm Post subject: |
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jamaeolus wrote:
The adaptation was actually quite easy as the back of the lens had 49mm threads. So 49mm/49mm reverse ring then 49 to 52 step up then 52 mm helical. It focuses to infinity. Close focus is not great. Around 6 feet (2m) or so. I did disassemble the lens and clean it as it had a bit of fungus and was a bit hazy. It is a 4 element lens with a cemented doublet at the front and air gapped back group. Since I had it apart I took the opportunity to line the interior with stick on black felt, as being a projection lens little attention had been paid to maintaining a light absorbtive interior. The very first shot was taken before any work had been done inside the lens. I think the attention improved contrast quite dramatically.
Some shots:
My interior work on the lens does make it vignette a bit. It is soft and even softer in the corners. Chromatic aberration can be problematic. Fantastic bokeh. Probably would be an excellent portrait lens (I am terrible at portraits).
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visualopsins
Joined: 05 Mar 2009
Posts: 10543
Location: California
Expire: 2025-04-11
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| Posted: Fri Nov 13, 2020 5:55 pm Post subject: |
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visualopsins wrote:
Real pretty colors in #5 !!!
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☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Sciolist
Joined: 29 Mar 2017
Posts: 1445
Location: Scotland
Expire: 2021-04-16
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| Posted: Fri Nov 13, 2020 5:57 pm Post subject: |
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Sciolist wrote:
#1 is a beaut  . Some shots just hit you. |
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Minolfan
Joined: 30 Dec 2008
Posts: 3437
Location: Netherlands
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| Posted: Fri Nov 13, 2020 11:35 pm Post subject: |
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Minolfan wrote:
Nothing wrong with the portrait of the cat!
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jamaeolus
Joined: 19 Mar 2014
Posts: 2931
Location: Eugene
Expire: 2015-08-20
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| Posted: Sat Nov 14, 2020 12:46 am Post subject: |
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jamaeolus wrote:
Well I say not too bad considering its an action shot close in with a very thin DOF I missed the eye focus by about a half an inch (front focused). My wife loves that shot. Kiko is 7 months now and is just always moving...or asleep.
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jamaeolus
Joined: 19 Mar 2014
Posts: 2931
Location: Eugene
Expire: 2015-08-20
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| Posted: Fri Nov 20, 2020 6:40 pm Post subject: |
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jamaeolus wrote:
I find this lens very intriguing and am impressed with its sharpness even wide open. It appears to me to be a tessar design. The groups are about 4 inches from each other. I was considering adding an aperture. If I were to do that where is the best place for that? It has 2 dramatically different size barrels with a step down very near the center between the groups. Would the step down be a good spot for that?
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jamaeolus
Joined: 19 Mar 2014
Posts: 2931
Location: Eugene
Expire: 2015-08-20
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| Posted: Wed Nov 25, 2020 8:13 pm Post subject: |
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jamaeolus wrote:
So a portrait of the cat presented itself. He was lounging on the (unmade) bed with the sun filtered through high clouds shining on him through the window. 
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Lloydy
Joined: 02 Sep 2009
Posts: 7785
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Thu Nov 26, 2020 12:17 am Post subject: |
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Lloydy wrote:
Very nice, worth the effort.
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LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
My Flickr https://www.flickr.com/photos/mudplugga/
My ipernity -
http://www.ipernity.com/home/294337 |
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