Andrew Laverghetta |
Distance Scale on Sigma Lens
There is also an "R" near the fstop numbers just to the right of center. I also notice that there aren't any numbers below 5.6 listed. Is this because there wasn't really room to squeeze them in? Is this just kind of like a mock up and not a reliable scale? Thanks!
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Christopher A. Vedros |
Andrew, it looks to me like you have a handle on hyperfocal distance focusing. Your assumption is correct, if you set the camera to f/22, everything between the two "22"s should be in focus. Not sure about the "R". Are you sure it's not an 8? That would make more sense to me. Chris
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Jon Close |
The depth of field scale on that lens is only applicable when at 24mm. Zoomed to any other length the DoF narrows considerably. The R mark is for focusing with infrared film/filter. Focus normally, then correct the focus for IR by turning the focus ring a bit to the right so that what was under the "" mark is under the "R" instead. For many zoom lenses the amount of IR correction will vary with the focal length. The R mark for this lens may be for all focal lengths, or like the DoF scale may be for 24mm only. Was there not an instruction sheet packed with the lens?
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Jon Close |
>>... what was under the " " mark ...<< should be ... what was under the "l" (normal focus) mark ...
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Andrew Laverghetta |
Thanks for the help! Yeah, I was wondering if that was only for the 24mm focal length. Yes, there was a small sheet in many different languages, I read the English portion but it didn't tell much if anything about using the scale. Thanks again!
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