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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Fri Jul 07, 2017 6:25 pm Post subject: 8mm-ish lens from DLP projector on Lumix GF3 |
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iangreenhalgh1 wrote:
I fancied one of those cheap 8mm fisheye lenses for shooting video on M4/3, but then I came up with a cheaper DIY solution. The lens is from a broken Viewsonic projector, temporarily mounted in extension tubes with tape, no markings on it so I have to guess the specs, I think it's around f2 and 8mm. It's sharp enough and no distortion until the very outer edges, will be very useful for video and architectural stills.
_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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Lloydy
Joined: 02 Sep 2009 Posts: 7775 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Sat Jul 08, 2017 12:02 am Post subject: |
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Lloydy wrote:
Wow.....
Pic's of the lens? _________________ 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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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Sat Jul 08, 2017 12:24 am Post subject: |
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iangreenhalgh1 wrote:
I'll take a pic of it tomorrow.
This is the projector it came from:
_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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luisalegria
Joined: 07 Mar 2008 Posts: 6627 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Sat Jul 08, 2017 8:23 pm Post subject: |
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luisalegria wrote:
Thats worth a look Ian!
Better coverage for that format than most things I've seen that are "free". _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Sun Jul 09, 2017 11:54 am Post subject: |
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iangreenhalgh1 wrote:
Here's some samples in better light on my Lumix G3 which has a much better sensor than the GF3.
#1
100% crop:
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100% crop:
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100% crop:
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_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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luisalegria
Joined: 07 Mar 2008 Posts: 6627 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Sun Jul 09, 2017 2:22 pm Post subject: |
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luisalegria wrote:
This works very well indeed!
How does the rig look? _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5027 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Sun Jul 09, 2017 5:25 pm Post subject: |
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kansalliskala wrote:
amazing what you can salvage from defunct equipment!
_________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Sun Jul 09, 2017 11:15 pm Post subject: |
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iangreenhalgh1 wrote:
Here's some pics of the lens mounted on my G3:
_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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uddhava
Joined: 22 Aug 2012 Posts: 3071 Location: Hungary
Expire: 2021-06-21
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Posted: Mon Jul 10, 2017 11:19 am Post subject: |
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uddhava wrote:
Pretty cool. |
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kryss
Joined: 13 Sep 2009 Posts: 2169 Location: Canada
Expire: 2017-09-18
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Posted: Mon Jul 10, 2017 2:42 pm Post subject: |
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kryss wrote:
_________________ Do not trust Atoms....they make up everything. |
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luisalegria
Joined: 07 Mar 2008 Posts: 6627 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Mon Jul 10, 2017 7:31 pm Post subject: |
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luisalegria wrote:
What lens did you stick that on Ian?
It seems to work as a fisheye adapter.
Unless you are using a junk lens as just a focusing mount. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Mon Jul 10, 2017 7:37 pm Post subject: |
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iangreenhalgh1 wrote:
I'm using the body of a Teleplus focusing macro teleconverter as a helicoid, the optics are all from the projector, it's in one block and I just taped it to the helicoid for testing.
These ultra short throw projectors are very easy to find for very little money, they were used in huge numbers in schools, colleges and offices and have no resale value.
An example is the Epson Powerlite 410W, which has an f1.8 6.84mm lens. _________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Wed Jul 19, 2017 6:57 pm Post subject: |
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iangreenhalgh1 wrote:
I had a dig in my parts box and found the right bits to mount this thing properly. I used a tube from the back of a crappy 135mm t mount lens that had long ago been pulled apart for bits, it still had the T-M42 mount on it. I had to remove some plastic from the back of the lens to make the tube fit over it, then securely epoxied it in place. Then all I had to do was screw it into an M42-M4/3 helicoid and the job was done.
#1
#2
#3
_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Wed Jul 19, 2017 7:03 pm Post subject: |
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iangreenhalgh1 wrote:
In this helicoid, it will focus anywhere from infinity to actually touching the front glass, which is how I took this photo of a bottle - the front element was pressed up against the bottle:
100% crop:
However, I will probably only ever shoot this lens at infinity, where the distortion in negligible and any smeariness is limited to the very corners and is only moderate so I'm very happy with how it performs, especially as it's an extremely fast lens for so wide a FOV, it is somewhere in the f1.7-f2 range.
_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Thu Jul 20, 2017 1:00 am Post subject: |
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iangreenhalgh1 wrote:
HDR series, I like this lens for architectural shots.
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_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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kds315*
Joined: 12 Mar 2008 Posts: 16497 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Thu Jul 20, 2017 1:01 pm Post subject: |
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kds315* wrote:
Not bad at all for a moulded plastic piece!! _________________ 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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Eddie46
Joined: 05 Dec 2016 Posts: 135 Location: cardiff,UK
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Posted: Thu Jul 20, 2017 2:10 pm Post subject: |
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Eddie46 wrote:
The price of Old projectors will now skyrocket on Ebay!! |
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luisalegria
Joined: 07 Mar 2008 Posts: 6627 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Thu Jul 20, 2017 2:16 pm Post subject: |
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luisalegria wrote:
Some brilliant stuff there Ian!
Britain looks a lot better in the sunshine. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Thu Jul 20, 2017 3:42 pm Post subject: |
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iangreenhalgh1 wrote:
Cheers folks. There's a plentiful supply of projectors on ebay, they are basically worthless secondhand. There are a lot of models of ultra short throw projector out there, by many manufacturers, they cost 20-50ukp on ebay, I can list come models if people want to look for them.
Here's a few more HDR, I chose to shoot HDR with this lens because I discovered that the G3 was unable to accurately expose many scenes shot with this lens as so much of the frame is sky, so it tends to expose for the sky and leave you with the buildings and ground 2-3 stops underexposed. The G3 has very good bracketing however, I used 5 shots in 1 EV steps, althoguh 3 shots would probably suffice.
#1 Stitched from 7 shots
#2 Another stitch, but sadly slightly out of focus
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_________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Thu Jul 20, 2017 3:47 pm Post subject: |
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iangreenhalgh1 wrote:
My original intention for this lens was to use it to shoot video, it works quite well for that, albeit with some stretching at the edges of the frame:
https://www.youtube.com/watch?v=v2P4Dlq-grY _________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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Lloydy
Joined: 02 Sep 2009 Posts: 7775 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Thu Jul 20, 2017 8:43 pm Post subject: |
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Lloydy wrote:
I like the rendering of this lens - pic's 16 and 17 show it nicely, the contrast on the stone building and the railway steps is wonderful, it captures the textures. The look at the pastel sky, there's a glow - but it's a nice glow. It's a distinctive lens for sure, and rather good as well. _________________ 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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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Thu Jul 20, 2017 10:33 pm Post subject: |
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iangreenhalgh1 wrote:
Cheers Dave. This lens has a slight diffuse glow, largely only apparent on oof areas, which I expect is due to a tad of uncorrected spherical aberration. One of the things I like best about using unusual optics that were not intended for use taking pictures on a camera is that often they were designed with totally different criteria therefore the corrections of aberrations are often quite different to most camera lenses which means you get an unusual aesthetic 'look' to the images. This is not always a good thing, it can mean awful colour fringing on oof areas due to LoCA (a common issue with projection lenses) but in the case of this lens, it works out nicely, CA is very minimal and mostly only visible on the edges, one click in ACR when loading the RAW images into PS CS6 removes it so it's a non-issue. _________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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