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#11
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Exposure calculation
"MangroveRoot" wrote
Would I be right in the belief that this question, and the solutions to it, would be applicable to formats other than "large", should one care to do such a thing? If the lenses you use for your 645 are attached directly to the body, and especially if your 645 has a built in TTL meter, the answer is "no." If your lens attaches via a bellows, and your 645 doesn't have TTL, then the answer is "yes." The greater the extension of the lens from the body, the greater the required exposure. |
#12
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Exposure calculation
Howard Lester wrote:
"MangroveRoot" wrote Would I be right in the belief that this question, and the solutions to it, would be applicable to formats other than "large", should one care to do such a thing? If the lenses you use for your 645 are attached directly to the body, and especially if your 645 has a built in TTL meter, the answer is "no." If your lens attaches via a bellows, and your 645 doesn't have TTL, then the answer is "yes." The greater the extension of the lens from the body, the greater the required exposure. That would be a "no" on both counts. I *do* have a set of metal extension tubes, but that's not the same thing. I was just curious. Sometimes it's nice to know more than I think I'll need. Thank you Howard and otzi; your answers were ... illuminating! |
#13
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Exposure calculation
Amazing!
Having re-read this post in day time, I now see the question. Bum, My continual problem with late night web gazing Can I take back my inappropriate response. (blush,blush) "MangroveRoot" wrote in message news:C323k.1208$Mu.42@trndny07... Howard Lester wrote: "MangroveRoot" wrote Would I be right in the belief that this question, and the solutions to it, would be applicable to formats other than "large", should one care to do such a thing? If the lenses you use for your 645 are attached directly to the body, and especially if your 645 has a built in TTL meter, the answer is "no." If your lens attaches via a bellows, and your 645 doesn't have TTL, then the answer is "yes." The greater the extension of the lens from the body, the greater the required exposure. That would be a "no" on both counts. I *do* have a set of metal extension tubes, but that's not the same thing. I was just curious. Sometimes it's nice to know more than I think I'll need. Thank you Howard and otzi; your answers were ... illuminating! |
#14
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Exposure calculation
"MangroveRoot" wrote
If the lenses you use for your 645 are attached directly to the body, and especially if your 645 has a built in TTL meter, the answer is "no." If your lens attaches via a bellows, and your 645 doesn't have TTL, then the answer is "yes." The greater the extension of the lens from the body, the greater the required exposure. That would be a "no" on both counts. I *do* have a set of metal extension tubes, but that's not the same thing. I was just curious. Sometimes it's nice to know more than I think I'll need. Oh yeah - extension tubes. I forgot about those things. ;-) Extension tubes serve the same purpose as a bellows, so it IS effectively the same thing: they/it push your lens further from the film plane than it would be if mounted directly to the body. The greater the extension, the more you have to compensate for light loss. |
#15
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Exposure calculation
Howard Lester wrote:
Oh yeah - extension tubes. I forgot about those things. ;-) Extension tubes serve the same purpose as a bellows, so it IS effectively the same thing: they/it push your lens further from the film plane than it would be if mounted directly to the body. The greater the extension, the more you have to compensate for light loss. Okay ... I get what you mean. As it happens, the extension tubes I have include linkages that connect the aperture detector (?) on/in the body to the aperture adjustment on the lens. It is in that sense that I said that they are a different case. At least, that's what I *think* I meant. Mostly I'm trying to extract the fundamentals from what is being said, so that, even if I don't need them now, I'll have them tucked away for future use. Thanks again for the clarifications. |
#16
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Exposure calculation
"MangroveRoot" wrote
As it happens, the extension tubes I have include linkages that connect the aperture detector (?) on/in the body to the aperture adjustment on the lens. It is in that sense that I said that they are a different case. (Extension tubes on a large format camera ... that is a first.) Yes, extension tubes that carry through the linkages often don't need any intervention to compensate for extension and can be used with wide-open metering. -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index2.htm n o lindan at ix dot netcom dot com |
#17
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Exposure calculation
"Nicholas O. Lindan" wrote
(Extension tubes on a large format camera ... that is a first.) He(?)'s using them on a 645, not LF. But yeah, on LF that'd be something. ;-) |
#18
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Exposure calculation
I think I have seen lens cones for LF cameras - but I think it
was for using a longer lens rather than macro work, would work for either. -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index2.htm n o lindan at ix dot netcom dot com |
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