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Macro Question
Jul 27, 2015 15:33:26 #
I believe the min. focus distance for my 105mm is .34??mm, this NEF photo is .33mm (exiftool). Does the large crop affect the macro standing.
Before somebody comments on her weird looking head, I believe she is looking straight up at the lens. REJ.
Before somebody comments on her weird looking head, I believe she is looking straight up at the lens. REJ.
Jul 27, 2015 19:29:48 #
REJ, from the location of the wings, I'd think it's looking straight down.
Nice pic though.
Nice pic though.
Jul 28, 2015 01:51:37 #
The Minimum Working Distance (lens front element to subject) of a 105-mm macro lens is 157-mm (6.2-inches), regardless of camera format, and regardless of the lens manufacturer.
Jul 28, 2015 14:33:04 #
Nikonian72 wrote:
I'm trying to learn how to measure here for close-ups and macro, so my comment here his is not academic. Just one example, this metric affects when I manually switch a macro lens on or off Full. I've been making it work, but really it has been hit or miss -- not my style, really. The Minimum Working Distance (lens front element to subject) of a 105-mm macro lens is 157-mm (6.2-inches), regardless of camera format, and regardless of the lens manufacturer.
So, you say as above but Nikon, without contradicting, I think, says AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED [CRC], July 2015, the minimum focus distance is 1.0' (0.314m).
I believe the Nikon value is wrt the sensor and is called Closest Focusing Distance, but you are citing wrt the front element, presumably not the outer glass or lens frame or sensor.
Maybe lens elements move in a CRC lens? Maybe some lens is or is not internal focus?
Jul 28, 2015 17:00:40 #
Focusing Distance is measured from sensor to subject.
Working Distance is measured from lens front element to subject.
MWD is more important to macro-photographers than MFD, because of illumination logistics.
Your original post states "I believe the min. focus distance for my 105mm is .34??mm, this NEF photo is .33mm".
1/3-mm is damn short! 1/3-meter is closer to correct.
As you work more with macro, you will begin to think in terms of Working Distance rather than focusing distance.
Working Distance is measured from lens front element to subject.
MWD is more important to macro-photographers than MFD, because of illumination logistics.
Your original post states "I believe the min. focus distance for my 105mm is .34??mm, this NEF photo is .33mm".
1/3-mm is damn short! 1/3-meter is closer to correct.
As you work more with macro, you will begin to think in terms of Working Distance rather than focusing distance.
Jul 28, 2015 17:14:09 #
Nikonian72 wrote:
Unless the lens isn't actually "105mm" when focused closely (which is common among back-focusing lens designs) right?The Minimum Working Distance (lens front element to subject) of a 105-mm macro lens is 157-mm (6.2-inches), regardless of camera format, and regardless of the lens manufacturer.
My Sigma 150 macro lens is nowhere near 150mm when at MWD.
Jul 28, 2015 18:38:14 #
majestros wrote:
The MWD of a 150-mm macro lens is 225-mm = 8.9-inches.My Sigma 150 macro lens is nowhere near 150mm when at MWD.
The easiest way to confirm MWD is to physically measure WD during this procedure:
FAQ: How to Document Field-of-View of a Macro Lens
http://www.uglyhedgehog.com/t-36370-1.html
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