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kansalliskala
Joined: 19 Jul 2007 Posts: 5038 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Tue Jan 31, 2023 1:44 pm Post subject: How do you focus to 10 kilometers |
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kansalliskala wrote:
I have started to take photographs of high flying planes again.
How do I focus. The scale of my lens is a bit off so it gets over infinity.
Is it possible to focus like to 1 km and to 100 meters and some how extrapolate the right position? _________________ 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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calvin83
Joined: 12 Apr 2009 Posts: 7555 Location: Hong Kong
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Posted: Tue Jan 31, 2023 2:17 pm Post subject: |
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calvin83 wrote:
a. get a better adapter
b. shim the adapter
c. adjust your lens to fit the adapter
d. print your own custom distance scale and stick it to the focus ring of your lens _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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RokkorDoctor
Joined: 27 Nov 2021 Posts: 1415 Location: Kent, UK
Expire: 2025-05-01
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Posted: Tue Jan 31, 2023 2:27 pm Post subject: |
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RokkorDoctor wrote:
I can only assume that you will be using a very long focal length lens, otherwise the question would be a bit of a non-issue.
The problem is that most super telephoto lenses do not have an accurately calibrated focus scale anyway at the long end; changes in temperature affect both the effective focal length as well as the physical length of the lens, hence most of them are designed to be able to focus beyond infinity to allow for some compensation in the field.
Assuming that you know the high flying planes are near 10km (a reasonable assumption for commercial airliners at cruising altitude, but it does vary a bit), I can't see any alternative than to find a land-based object of similar distance and focus on that first.
I do wonder though why you don't actually focus using the airplane(s) themselves? _________________ Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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visualopsins
Joined: 05 Mar 2009 Posts: 10983 Location: California
Expire: 2025-04-11
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Posted: Tue Jan 31, 2023 6:33 pm Post subject: |
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visualopsins wrote:
A landmark exactly 10km from my position as measured on Google Maps.
Although probably more accurate to focus on the plane being photographed. _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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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kansalliskala
Joined: 19 Jul 2007 Posts: 5038 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Fri Feb 03, 2023 8:34 am Post subject: |
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kansalliskala wrote:
visualopsins wrote: |
A landmark exactly 10km from my position as measured on Google Maps. |
I think I can get about 2,298 kilometers from my upstairs window.
(the blue line)
#1
_________________ 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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RokkorDoctor
Joined: 27 Nov 2021 Posts: 1415 Location: Kent, UK
Expire: 2025-05-01
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Posted: Fri Feb 03, 2023 11:04 am Post subject: |
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RokkorDoctor wrote:
kansalliskala wrote: |
visualopsins wrote: |
A landmark exactly 10km from my position as measured on Google Maps. |
I think I can get about 2,298 kilometers from my upstairs window.
(the blue line) |
Asking the local authorities for permission to install a couple of large opposing mirror arrays in your valley might be the answer then.
Our you could build your own DIY collimator calibrated at 10km, whichever works out cheaper...
Joking aside, you could build your own simple DIY 10km collimator from an old SLR camera body and lens; you would have to to modify that lens to allow for focusing just a bit beyond infinity so the focusing screen of that camera as seen through the front of that lens has a virtual image at 10km behind that camera, and use that for collimation.
But that would still leave you with the problem of drift under changes in temperature... _________________ Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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stevemark
Joined: 29 Apr 2011 Posts: 3953 Location: Switzerland
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Posted: Sun Feb 05, 2023 2:38 pm Post subject: |
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stevemark wrote:
kansalliskala wrote: |
#1
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Incredible - somehow this small map seemed to be familiar to some extent, and i checked on google maps. Somehow "Hirsijärvi" rung a bell, and probably I have been there when I was about 20 years old, in wintertime. If I'm right (not completey sure yet) we went there with some friends from Turku; they had their mökki somwhere on the shore of that lake ... Just one or two nights out there, pretty cold weather, a frozen lake and a terrific full moon. And ... well, let's talk about that later when I have confirmed the story.
S _________________ www.artaphot.ch |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5038 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Mon Feb 06, 2023 6:19 am Post subject: |
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kansalliskala wrote:
[quote="stevemark"]
kansalliskala wrote: |
Incredible - somehow this small map seemed to be familiar to some extent, and i checked on google maps. Somehow "Hirsijärvi" rung a bell, and probably I have been there when I was about 20 years old, in wintertime. If I'm right (not completey sure yet) we went there with some friends from Turku; they had their mökki somwhere on the shore of that lake ... Just one or two nights out there, pretty cold weather, a frozen lake and a terrific full moon. And ... well, let's talk about that later when I have confirmed the story.
S |
the world is surprisingly small _________________ 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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visualopsins
Joined: 05 Mar 2009 Posts: 10983 Location: California
Expire: 2025-04-11
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Posted: Sun Feb 12, 2023 5:37 am Post subject: |
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visualopsins wrote:
https://www.flightradar24.com/60.59,10.52/6 _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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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