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85mm
Dec 30, 2011 21:37:57 #
Nikonian72 wrote:
when your lens is focused to far distance, it should read f/3.5. As you focus closer, the lens length physically changes, which also changes your actual focal length. At the same time, the physical aperture does not change, but the ratio between aperture diameter and focal length changes, causing aperture ratio to increase from 3.5 to 4.8 or whatever.
Nikonian U Da Man
thx
Dec 31, 2011 01:20:10 #
Thank you Nikonian72 i totally get it. I new you would respond and have an easy to understand answer i appreciate you thanks
Dec 31, 2011 07:37:53 #
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Dec 31, 2011 08:26:05 #
Dec 31, 2011 09:02:51 #
Read your manual...I had the 105mm VR version...depending on the distance from your subject it will an effect on your F stop....the 105 was anythiing over 10 ft...I could get it down to 2.8....and if I was really close to my sbject for macro...I could get it high enough to F45! There is nothing wrong with it...
Dec 31, 2011 13:57:00 #
so I'm guessing here, the lens is not strictly f3.5 through out? should it be?
Dec 31, 2011 14:15:04 #
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Dec 31, 2011 14:25:28 #
Dec 31, 2011 14:50:03 #
Dec 31, 2011 17:34:15 #
Dec 31, 2011 17:40:35 #
travelwp wrote:
Well the lens should work fine on the D7000, so it must be the lens.
the lens is working exactly the way it's supposed to according to the manual.
Quote:
Maximum aperture
f/3.5 at infinity.
f/5 at 1:1.
End quote.
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Dec 31, 2011 18:20:01 #
Jan 1, 2012 00:18:51 #
rpavich wrote:
According to the manual:
Maximum aperture
f/3.5 at infinity.
f/5 at 1:1.
Maximum aperture
f/3.5 at infinity.
f/5 at 1:1.
that's interesting that the lens does that, then his lens is probably working fine then.
Nov 9, 2013 21:33:04 #
Nikonian72 wrote:
when your lens is focused to far distance, it should read f/3.5. As you focus closer, the lens length physically changes, which also changes your actual focal length. At the same time, the physical aperture does not change, but the ratio between aperture diameter and focal length changes, causing aperture ratio to increase from 3.5 to 4.8 or whatever.
Isn't this true with all lenses? That the lowest aperture number occurs at the maximum distance of the lens?
Nov 10, 2013 00:54:30 #
jethro779 wrote:
So it used to be. Isn't this true with all lenses? That the lowest aperture number occurs at the maximum distance of the lens?
Now there are lenses with "fixed apertures". In the construction of a lens of this type, the aperture functions independently of the focal length, which results in lens of heavier (and more expensive) construction. Often, the barrels on fixed aperture lenses do not extend and contract as they are zoomed in and out: http://www.beyondmegapixels.com/2011/04/photography-101-fixed-aperture-explained
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