Nikon's 1.5 multiplication Factor for DX lenses?
Jul 5, 2018 07:56:00 #
I am confused with this multiplication factor.
If I buy a DX lens and mount it on my D5200 do I have to apply the multiplication factor?
OR
Is the multiplication factor only applied if I mount an FX lens on the camera?
If I buy a DX lens and mount it on my D5200 do I have to apply the multiplication factor?
OR
Is the multiplication factor only applied if I mount an FX lens on the camera?
Jul 5, 2018 07:59:50 #
The 1.5x applies to the focal length of any lens on a DX camera. It has nothing to do with whether the lens was designed for FX or DX bodies.
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Jul 5, 2018 08:02:26 #
The mutiplication factor only applies to field of view, the accual focal length does not change.
Jul 5, 2018 08:03:04 #
Thank-you for the quick reply Bill.
It just seems strange that they make a DX lens for a DX camera and it isn't the focal length stated on the lens.
Anyway, now I know.
It just seems strange that they make a DX lens for a DX camera and it isn't the focal length stated on the lens.
Anyway, now I know.
Jul 5, 2018 08:06:52 #
Thanks Jerry. I'm not sure I understand your reply.
Is it because the DX camera has a smaller chip than the full frame therefore it only uses a part of the image?
Focal length stated is only for full frame cameras.
Is it because the DX camera has a smaller chip than the full frame therefore it only uses a part of the image?
Focal length stated is only for full frame cameras.
Jul 5, 2018 08:10:17 #
The multiplication factor is referenced to the sensor size of the camera.
If your camera is APS-C sized, use the factor for all the lenses.
The multiplication factor is different for different crop sensor sizes in cameras-- as Micro 4/3rds- or 1"...
If your camera is APS-C sized, use the factor for all the lenses.
The multiplication factor is different for different crop sensor sizes in cameras-- as Micro 4/3rds- or 1"...
Jul 5, 2018 08:11:41 #
Jul 5, 2018 08:16:49 #
dragonking wrote:
Is it because the DX camera has a smaller chip than the full frame therefore it only uses a part of the image?
YesIs it because the DX camera has a smaller chip than the full frame therefore it only uses a part of the image?
dragonking wrote:
Focal length stated is only for full frame cameras.
No - the focal length of any lens is a physical property based on the design, the distance from the front surface where the image is formed. A 75mm lens is the same focal length no matter what camera it is placed on. However, the field of view (usually expressed in angle of coverage) will change with the camera sensor size resulting in the seemingly never ending confusion over crop factor.
Jul 5, 2018 08:18:00 #
dragonking wrote:
Thank-you for the quick reply Bill.
It just seems strange that they make a DX lens for a DX camera and it isn't the focal length stated on the lens.
Anyway, now I know.
It just seems strange that they make a DX lens for a DX camera and it isn't the focal length stated on the lens.
Anyway, now I know.
It’s the focal length stated on the lens. Whether you were to put a 35mm ff lens or a 35mm DX lens on your DX sensored camera your image would look the same/have the same field of view.
The DX lens is made to cover a smaller sensor, so if it were used on a full-frame camera, it may exhibit vignetting. That’s why they are smaller and most likely less expensive.
What the “crop factor” is trying to do is to give you something standard to compare to. It uses the same 35mm (or FF Sensor) that people coming from film may recognize. It’s becoming less relevant now as more new photographers emerge who may not have even shot film.
Jul 5, 2018 08:31:39 #
dragonking wrote:
Thank-you for the quick reply Bill.
It just seems strange that they make a DX lens for a DX camera and it isn't the focal length stated on the lens.
Anyway, now I know.
It just seems strange that they make a DX lens for a DX camera and it isn't the focal length stated on the lens.
Anyway, now I know.
Focal length is focal length. What the lens indicates as the focal length is the focal length of the lens. period.
The crop factor achieves an equivalent field of view. The crop factor applies to all lenses used on the crop-sensor body, both FX and DX.
Jul 5, 2018 08:41:42 #
dragonking wrote:
I am confused with this multiplication factor.
If I buy a DX lens and mount it on my D5200 do I have to apply the multiplication factor?
OR
Is the multiplication factor only applied if I mount an FX lens on the camera?
If I buy a DX lens and mount it on my D5200 do I have to apply the multiplication factor?
OR
Is the multiplication factor only applied if I mount an FX lens on the camera?
You really don't need to do anything other than take your pictures. The multiplication factor deals with field of view, as has been stated. The attached diagram may help.
Jul 5, 2018 08:47:20 #
brucewells wrote:
You really don't need to do anything other than take your pictures.
Bingo!
Jul 5, 2018 08:48:00 #
dragonking wrote:
I am confused with this multiplication factor.
If I buy a DX lens and mount it on my D5200 do I have to apply the multiplication factor?
OR
Is the multiplication factor only applied if I mount an FX lens on the camera?
If I buy a DX lens and mount it on my D5200 do I have to apply the multiplication factor?
OR
Is the multiplication factor only applied if I mount an FX lens on the camera?
Forget the numbers; enjoy the pictures and the picture-taking process.....
Jul 5, 2018 08:51:06 #
I do take the pictures and enjoy it.
When I worked I was an engineer and I always wanted to know why. so I understood why things were.
Same here.
When I worked I was an engineer and I always wanted to know why. so I understood why things were.
Same here.
Jul 5, 2018 08:57:40 #
dragonking wrote:
Thanks Jerry. I'm not sure I understand your reply.
Is it because the DX camera has a smaller chip than the full frame therefore it only uses a part of the image?
Focal length stated is only for full frame cameras.
Is it because the DX camera has a smaller chip than the full frame therefore it only uses a part of the image?
Focal length stated is only for full frame cameras.
Focal length does not change. It is what it is. Using a smaller sensor increases apparent magnification by cropping more of the image cone projected onto it.
A 50mm lens has the equivalent field of view of a 75mm lens when used on a DX body. But it is still a 50mm lens!
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