I have to apply the crop factor 1.5 to apertures in my lens?
May 3, 2015 22:44:04 #
I have Nikon D7100 with Nikon Micro 105mm F\2.8 and Tamron 16-300 F/3.5-6.3. The crop factor for the D7100 is 1.5; so because of the crop, the Nikon 105mm is LIKE having a 157.5mm and the Tamron looks LIKE 24-450mm, that's ok with me. That is the same thing with the aperture the 1.5 crop applies?. So I don't have a F\2.8 it is a F\4.2? And the Tamron is not F\3.5-6.3 is a F\5.25-9.45? :cry:
May 3, 2015 22:50:14 #
May 3, 2015 22:53:37 #
DWU2 wrote:
No, crop factor has no comparable effect on aperture.
I saw this: http://www.youtube.com/watch?v=YDbUIfB5YUc
and that's why I'm asking
May 3, 2015 22:56:07 #
jlrivera wrote:
I saw this: http://www.youtube.com/watch?v=YDbUIfB5YUc
and that's why I'm asking
and that's why I'm asking
Well I couldn't get it play. But as you were already told the crop factor has no effect on aperture. Crop factor means that your sensor is only recording a portion of the projected image; i.e. cropping what it records.
May 3, 2015 23:04:39 #
Aperture is aperture. It does not change.
However the depth of field WILL change if the scene you capture is cropped the same as it would be on the other format. Perspective will change if you maintain the same crop, too.
However the depth of field WILL change if the scene you capture is cropped the same as it would be on the other format. Perspective will change if you maintain the same crop, too.
May 3, 2015 23:06:56 #
jlrivera wrote:
I have Nikon D7100 with Nikon Micro 105mm F\2.8 and Tamron 16-300 F/3.5-6.3. The crop factor for the D7100 is 1.5; so because of the crop, the Nikon 105mm is LIKE having a 157.5mm and the Tamron looks LIKE 24-450mm, that's ok with me. That is the same thing with the aperture the 1.5 crop applies?. So I don't have a F\2.8 it is a F\4.2? And the Tamron is not F\3.5-6.3 is a F\5.25-9.45? :cry:
It has an effect on DOF - for equivalent fields of view - and so that translates to a full frame DOF equivalence (aperture) by multiplying the aperture by the crop factor. It has NOTHING to do with light gathering or exposure ....
May 3, 2015 23:21:27 #
May 3, 2015 23:32:09 #
MtnMan wrote:
Well I couldn't get it play. But as you were already told the crop factor has no effect on aperture. Crop factor means that your sensor is only recording a portion of the projected image; i.e. cropping what it records.
Thanks
May 3, 2015 23:32:42 #
burkphoto wrote:
Aperture is aperture. It does not change.
However the depth of field WILL change if the scene you capture is cropped the same as it would be on the other format. Perspective will change if you maintain the same crop, too.
However the depth of field WILL change if the scene you capture is cropped the same as it would be on the other format. Perspective will change if you maintain the same crop, too.
Thanks
May 3, 2015 23:34:00 #
imagemeister wrote:
It has an effect on DOF - for equivalent fields of view - and so that translates to a full frame DOF equivalence (aperture) by multiplying the aperture by the crop factor. It has NOTHING to do with light gathering or exposure ....
That makes sense. Thanks
May 3, 2015 23:40:13 #
A 100mm lens is a 100mm lens on a FF or Crop Frame body. All that changes is the amount of the scene the sensor, the angle of view - and the imaginary extension of the lens. A crop sensor reads only the center portion of the whole lens; the actual focal length does not change. Inasmuch as the aperture is expressed as a mathematical relationship between the focal length and the diameter of the lens opening, an aperture of f/4 on a 100mm lens indicates an opening 25mm in diameter and an aperture of f/16 indicates an opening 6.25 mm in diameter. The size of the sensor does not magically change the focal length of the lens nor the aperture.
May 4, 2015 01:40:01 #
May 4, 2015 05:50:23 #
Mogul wrote:
A 100mm lens is a 100mm lens on a FF or Crop Frame... (show quote)
Like it - a scientist communicating positively with a lay person :-)
May 4, 2015 06:01:46 #
Did an experiment to prove it to myself.
Lined up the black and white pawns in a chess set with a king in the center.
Four sensors 1/2.3 inch - fz200
1 inch Nikon 1
DX
FX
Lenses
FZ200 set to 50mm equivalent to fx
Nikon 1 - 18.5mm or 50mm equivalent to fx
DX - 35mm or 52.5mm equivalent to fx
FX - 50mm
So field of view was about the same for all.
Shots taken clearly showed different depth of field as the sensor changed but the aperture held constant.
Lined up the black and white pawns in a chess set with a king in the center.
Four sensors 1/2.3 inch - fz200
1 inch Nikon 1
DX
FX
Lenses
FZ200 set to 50mm equivalent to fx
Nikon 1 - 18.5mm or 50mm equivalent to fx
DX - 35mm or 52.5mm equivalent to fx
FX - 50mm
So field of view was about the same for all.
Shots taken clearly showed different depth of field as the sensor changed but the aperture held constant.
May 4, 2015 06:11:05 #
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