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04/16/2003 01:16:51 PM · #26 |
Originally posted by paganini:
Where did you find this?
you can get DOF with a G2 the same as on a 35mm with 24 mm lens (G2 @ F8 has a hyperfocal distance of 1.02 meters @ the 34 mm equivalent view). DOF has nothing to do with the format size. DOF is based on the coverage area + the focal length + aperature and is scalable. F-stops are DIFFERENT per camera format, FYI. Just because you can stop down to F-64 doesn't mean the DOF will be greater than 35 mm equivalent.
The reason for large format,etc. is for the size of the negative and the amount of enlargements you can make from it. |
Hmmm? For a given lens depth of field is inversely proportional to format size. Try it with a 1Ds vs. a 10D. When you're talking about using available lenses, a medium format camera will blow a 35mm out of the water at given f-stops.
article on the subject...
Message edited by author 2003-04-16 13:17:21. |
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04/16/2003 02:07:47 PM · #27 |
Uh, inversely proportional means that the larger the format size, the less DOF available :) You have just proven my point. INVERSELY means 1 / x.... that is, the bigger the format, the less the DOF @ a given view point and aperature.
Here's what dofmaster.com calculator gives for 35 mm at 50 mm lens @ F22: 3.73 m hyperfocal distance (greatest DOF)
Equivalent to 50 mm view on a 6x9 format is 125 mm lens, which has 9.99m @ F22, it needs to get stopped down a LOT more to F64 to get 3.61 m, hardly bigger than 35 mm format.
Originally posted by jimmythefish
Hmmm? For a given lens depth of field is inversely proportional to format size. Try it with a 1Ds vs. a 10D. When you're talking about using available lenses, a medium format camera will blow a 35mm out of the water at given f-stops.
[url=//www.photo.net/learn/optics/dofdigital/:
article on the subject...[/url] |
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04/16/2003 02:12:16 PM · #28 |
Jimmy: i think you're confusing the hyperfocal distance, the greater the number, the SMALLER the DOF.
Hyperfocal distance defines the depth of field from 1/2 of the distance to INFINITY that will appear on 8x12 print as being in FOCUS (i.e. within the CoC). The SMALLER the number, the greater the Depth of field
A DOF of 10 meters means from 5 to infinity, the objects will appear to be in focus. a DOF of 20 menas 10 to infinity, which is SMALLER DOF than the 10 meters hyperfocal distance. |
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04/16/2003 02:14:23 PM · #29 |
Right...I know what inversely proportional means. I never said anything about GREATER DOF, I said CONTROL over DOF. A smaller depth of field is a desireable effect of a large format.
Originally posted by paganini:
Uh, inversely proportional means that the larger the format size, the less DOF available :) You have just proven my point. INVERSELY means 1 / x.... that is, the bigger the format, the less the DOF @ a given view point and aperature.
Here's what dofmaster.com calculator gives for 35 mm at 50 mm lens @ F22: 3.73 m hyperfocal distance (greatest DOF)
Equivalent to 50 mm view on a 6x9 format is 125 mm lens, which has 9.99m @ F22, it needs to get stopped down a LOT more to F64 to get 3.61 m, hardly bigger than 35 mm format.
Originally posted by jimmythefish
Hmmm? For a given lens depth of field is inversely proportional to format size. Try it with a 1Ds vs. a 10D. When you're talking about using available lenses, a medium format camera will blow a 35mm out of the water at given f-stops.
[url=//www.photo.net/learn/optics/dofdigital/:
article on the subject...[/url] |
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04/16/2003 02:25:01 PM · #30 |
OK :) But most large format cameras are used for landscapes, aren't they? So they're most into the greater DOF as large as possible (F64 club...)
(However, the important thing is really the printing size of the negative.... can't beat that with 35 mm
)
Originally posted by jimmythefish:
Right...I know what inversely proportional means. I never said anything about GREATER DOF, I said CONTROL over DOF. A smaller depth of field is a desireable effect of a large format.
Originally posted by paganini:
Uh, inversely proportional means that the larger the format size, the less DOF available :) You have just proven my point. INVERSELY means 1 / x.... that is, the bigger the format, the less the DOF @ a given view point and aperature.
Here's what dofmaster.com calculator gives for 35 mm at 50 mm lens @ F22: 3.73 m hyperfocal distance (greatest DOF)
Equivalent to 50 mm view on a 6x9 format is 125 mm lens, which has 9.99m @ F22, it needs to get stopped down a LOT more to F64 to get 3.61 m, hardly bigger than 35 mm format.
Originally posted by jimmythefish
Hmmm? For a given lens depth of field is inversely proportional to format size. Try it with a 1Ds vs. a 10D. When you're talking about using available lenses, a medium format camera will blow a 35mm out of the water at given f-stops.
[url=//www.photo.net/learn/optics/dofdigital/:
article on the subject...[/url] |
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04/16/2003 02:34:45 PM · #31 |
MF and LF are usually very big, slow, heavy and expensive. Sure you get more DOF control but as Tony pointed out, most of the pictures I have seen produced from them are with an aperture of 1/64 or even 1/128. Unless you want a very large print or must have the absolute best quality I hardly see any reason to spend the big bucks for any of that equipment. The movements on view cameras can me quite nice though. I have TS-E lenses but they arenĂ¢€™t quite the same.
Greg
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