Documenting your macro fields at different magnifications
Jan 25, 2012 22:59:12 #
When I obtained my Nikkor 105D macro lens, I wanted to document the actual Field of View (FOV) at Minimum Working Distance (MWD).
My D90 sensor size is 23.6-mm x 15.8-mm.
I manually set 105D lens to maximum extension (closest focus), then physically moved camera in-&-out until target was in critical focus. I photographed a metallic metric scale (image #1). Notice captured field is approximately 23.5-mm wide. This is extremely close to 1:1 (life-size) capture.
Next, I added 68-mm of extension tubes (12 + 20 +36), and repeated procedure (image #2). Captured field is now about 12-mm wide. This is 4:1 (4x life-size) = twice as wide x twice as high.
My D90 sensor size is 23.6-mm x 15.8-mm.
I manually set 105D lens to maximum extension (closest focus), then physically moved camera in-&-out until target was in critical focus. I photographed a metallic metric scale (image #1). Notice captured field is approximately 23.5-mm wide. This is extremely close to 1:1 (life-size) capture.
Next, I added 68-mm of extension tubes (12 + 20 +36), and repeated procedure (image #2). Captured field is now about 12-mm wide. This is 4:1 (4x life-size) = twice as wide x twice as high.
105-mm MWD field of view
105-mm MWD field with 68-mm tubes
Jan 26, 2012 18:09:06 #
It's nice that you put information like this out here Nikonian. It all seems so "greek" to me. Numbers and I just don't get along. However, reading your post helps to make things look more understandable. Do you rely on the extension tubes very often for macro? Like I said before, I have the Tamron 60mm and once spring arrives (with bugs and flowers) I'll be out there practicing.
Jan 26, 2012 19:48:28 #
Pixelpixie88 wrote:
I am pleased that you find my pontifications useful!It's nice that you put information like this out here Nikonian. It all seems so "greek" to me. Numbers and I just don't get along. However, reading your post helps to make things look more understandable. Do you rely on the extension tubes very often for macro? Like I said before, I have the Tamron 60mm and once spring arrives (with bugs and flowers) I'll be out there practicing.
As a field macro-photographer, I rarely use extension tubes because of extremely shallow DOF. I have a hard enough time capturing bugs at f/22 when less than life-size.
Someday, I hope to acquire a motorized sequential stage to use for tabletop static (aka DEAD) insect photography, for focus stacked images.
Jan 27, 2012 16:41:36 #
Nikonian72 wrote:
motorized sequential stage = wow think i would love see if i could make some these on my milling table an lathe out of plastic after i blow the dust off it. http://www.produstrial.com/Stages-s/7186.htm?gclid=CL6bxdCT8a0CFWyHtgodPzX3tA quote=Pixelpixie88 It's nice that you put informa... (show quote)
all i can say is keep babbling
Jan 28, 2012 10:56:52 #
rayford2
Loc: New Bethlehem, PA
Nikonian72 wrote:
That was a great piece of information. Thank you.When I obtained my Nikkor 105D macro lens, I wante... (show quote)
Jan 29, 2012 13:50:33 #
Pepper
Loc: Planet Earth Country USA
Nikonian72 wrote:
What a great post! Thank youWhen I obtained my Nikkor 105D macro lens, I wante... (show quote)
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