Life size
Mar 5, 2012 16:11:43 #
2laner
Loc: Tennessee
Please explain what is meant by life size or 1/2 life size in relation to macro work. Life size in what format, in the camera screen or in an 8X10 or whatever.
Mar 5, 2012 18:14:21 #
Lets work with a dime. If you can fill the frame with a dime, edge to edge, and have it sharp. That is life size. Or 1:1
Erv
Erv
Mar 5, 2012 18:23:59 #
From a photog website:
1:1 is fairly simply, and best explained with a frame of film.
Let's say you set up a wonderful shot of a dime (a 10¢ piece) with a macro lens set to 1:1. You take the shot on a roll of film, have it developed, etc.
If you place that frame of film next to the dime, the image of the dime and the dime itself will be the same size.
What it means is that you're reproducing your subject on the imaging plane (film or sensor) at the same size that it exists in real life.
This is the same on digital, and is NOT affected by crop factor. What it means is that of your subject is, say, 12mmx12mm in size in real life, it will occupy a space of 12mmx12mm on your sensor.
If you're using a lens with "macro" capabilities (as some off-brand zooms are labelled), you're not getting true 1:1 reproduction. Some offer 1:2 (half size) but most are 1:3 or less (third size). What this means is that a subject that is 12x12mm would be 6x6mm or 4x4mm, depending on the lens.
This depends on the lens. The 18-200 youre using like exhibits some close-focus breathing, which isnt helping issues.
1:1 is fairly simply, and best explained with a frame of film.
Let's say you set up a wonderful shot of a dime (a 10¢ piece) with a macro lens set to 1:1. You take the shot on a roll of film, have it developed, etc.
If you place that frame of film next to the dime, the image of the dime and the dime itself will be the same size.
What it means is that you're reproducing your subject on the imaging plane (film or sensor) at the same size that it exists in real life.
This is the same on digital, and is NOT affected by crop factor. What it means is that of your subject is, say, 12mmx12mm in size in real life, it will occupy a space of 12mmx12mm on your sensor.
If you're using a lens with "macro" capabilities (as some off-brand zooms are labelled), you're not getting true 1:1 reproduction. Some offer 1:2 (half size) but most are 1:3 or less (third size). What this means is that a subject that is 12x12mm would be 6x6mm or 4x4mm, depending on the lens.
This depends on the lens. The 18-200 youre using like exhibits some close-focus breathing, which isnt helping issues.
Mar 5, 2012 19:32:11 #
2laner
Loc: Tennessee
Thanks, that gives me something to work on. The dime is a good place to start.
Mar 6, 2012 09:44:49 #
Mar 6, 2012 18:53:16 #
rpavich wrote:
From a photog website: br br br br br 1:1 is f... (show quote)
What is 'close-focus breathing??'
Mar 6, 2012 19:00:34 #
2laner wrote:
FAQ: What is a MACRO lens? Please explain what is meant by life size . . . in relation to macro work.
http://www.uglyhedgehog.com/t-26505-1.html
FAQ: Macro Lens vs Standard Prime & Zoom Lenses
http://www.uglyhedgehog.com/t-26499-1.html
FAQ: Macro websites & literature
http://www.uglyhedgehog.com/t-26500-1.html
FAQ: Macro-Photography Primer (DPReview.com)
http://www.uglyhedgehog.com/t-26510-1.html
True Macro-Photography Forum on UHH
http://www.uglyhedgehog.com/s-102-1.html
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