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dickb
Joined: 04 Apr 2008
Posts: 821
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 Posted: Sun Jun 06, 2010 1:41 pm Post subject: DoF adapter for large format lenses? |
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dickb wrote:
I have a couple of interesting medium and large format lenses (Pentac 8 inch f/2.9, Aerostigmat 305mm f/5, Deltamar 70mm f1.6) I'd like to use on a DSLR. I could of course mount them directly, but then I wouldn't take advantage of the large image circle and the resulting limited depth of field.
Video enthousiasts have been using 35mm DoF adapters for a long time. This allows 35mm format lenses to be used with small sensor video cameras, allowing narrow depth of field. The lens projects an image onto a ground glass and this image is filmed.
Has anybody tried something similar for large format lenses and DSLRs? I imagine the construction to be large and the image quality reduced because of the ground glass, but could it be/has it been done? |
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egidio
Joined: 02 Sep 2009
Posts: 222
Location: slovenia
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| Posted: Sun Jun 06, 2010 3:26 pm Post subject: |
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egidio wrote:
I'm thinking of making a medium format dof adapter for video, since everybody is using 35mm format on 5d now, this could make advantage in sensor size, but I'm just still collecting informations
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I use: Flektogon 2.8/20, Flektogon 2.8/35, planar 50mm/1.4, Takumar 1.4/50mm, Takumar 1.9/85, MIR 24H, Mir1v, Industar-50-2, Helios-44-2, Pentacon 2.8/135, cyclop 85 1.5 |
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josedad
Joined: 10 Feb 2010
Posts: 15
Location: Indonesia
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| Posted: Sun Jun 06, 2010 5:10 pm Post subject: |
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josedad wrote:
I have a thought doing DOF adapter with medium format lens too. It will give you an advantage of large ground glass. I have made 35mm DOF adapter for my camcorder. With my bronica ETRSI lenses I believe I will get larger projected image. But it need a grinding process to get larger ground glass.
Using medium format lens on fullframe DSLR is like using 35mm lens on 1,6 crop sensor. It`ll croppes. IMHO.
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Canon 500d, Contax 139 Quartz, Nikon FM2n, Nikon F3Hp, Minox 35 ML, Leica Minizoom, Contax TVS, Bronica ETRS-i
18-55mm II, Canon 55mm f1.2 SSC, Leitz Wetzlar 80~200 f4 Vario Elmar R, CZJ Tessar 58 2.8, Sears 200 f3.5, Zuiko 50mm f1.4, CZ Planar*T 50 f1.7, Raynox 25 f3.5, Samyang 18-35, Epoque 0.65 wide conv. Practikar 80~200 f4, Nikkor 80~200 f4, Yashica ML 28 f2.8, Yashica ML 35 f2.8, Chinon 135 f2.8, Super Takumar 200 f4
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visualopsins
Joined: 05 Mar 2009
Posts: 11054
Location: California
Expire: 2025-04-11
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| Posted: Sun Jun 06, 2010 5:54 pm Post subject: |
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visualopsins wrote:
Easiest for me would be make a light-tight box to hold 5D2 with 4/50 Macro-Takumar focused on Pentax 6x7 ground glass; images capture 49x69mm of the ground glass. Similar setup for LF lens & camera.
Designing a custom 2:3 adapter to utilize the entire 6x7 lens image circle only gains a few mm on the ground glass. Ground glass inside 100mm diameter tube about 110mm long, 6x7 mount on one end, filter threads on the other. (84.95mm 6x7 camera register + 25.4mm extension) 7" tube diameter for 4x5 lens; 15" diameter for 8x12 lens (  ).
On my long list of things to try someday...
Meanwhile, this works well!
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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-A 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 (151B), 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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Scheimpflug
Joined: 06 Feb 2010
Posts: 1888
Location: New Zealand / USA
Expire: 2011-11-18
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| Posted: Mon Jun 07, 2010 1:51 am Post subject: |
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Scheimpflug wrote:
| siriusdogstar wrote: |
| Meanwhile, this works well! |
I still would like to see a picture of that, if you have one. 
_________________
Sigma DP1, Nikon D40 (hers ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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