1.6 Crop Factor (Page 4): :sm24: :sm24: :sm24:...

Longshadow Loc: Audubon, PA, United States

Picture Taker wrote:

The lens designation is in relation to a full frame (old 35mm) camera. The crop factor depends on the brand of camera. It can't cover the full view to your size screen, thus it crops it and give you a boost ti magnification.

Longshadow Loc: Audubon, PA, United States

ggab wrote:

From Ziess.com "Making Sense of Sensors – Ful... (show quote)

Simple, isn't it......

Not to be complicated with pixel density differences, depth of field differences, or any exposure differences. Simply...
field of view.

gtheodore Loc: Fort Collins CO

It’s been at least twenty years since people started saying “you get more reach” with a lens on a cropped sensor camera. As several others have already commented, the answer is “no”. We cannot change the focal length of the lens. What changes is the angle of view. It’s the same as taking a full frame shot (35mm) and cropping it. I don’t understand why this is still being an issue. Some pros are still saying that. Same with ISO being a change in the sensitivity of the sensor. Arghh!

TV714

ggab wrote:

At no time did I reference "Field of View&quo... (show quote)

ggab is correct in what he says about the megapixel reduction when cropping a full-frame image down to what the image would be from a 1.6 crop sensor camera. However, it's much worse than he states, because the 1.6 (or 1.5 for Nikons) crop factor represents the reduction in each dimension of the full-frame sensor. So it's 1.6 X 1.6 = 2.56 reduction in the area of the sensor (1.5 X 1.5 = 2.25 for Nikons). Therefore a 20MP full-frame image cropped to the Canon crop factor would be 20MP / 2.56 = 7.8MP. For Nikons that would be 20MP / 2.25 = 8.9MP. Even a 30MP full-frame would only yield 11.7MP for Canons and 13.3MP for Nikons.

ggab Loc: ?

MT Shooter wrote:

In that case just show me one single sensor with a 1.43 crop factor. Refusing to see the obvious is no excuse.

It was used as an example

However if you insist:
Make Model Hor Vert
Nikon D60 23.6 15.8

Longshadow Loc: Audubon, PA, United States

gtheodore wrote:

It’s been at least twenty years since people started saying “you get more reach” with a lens on a cropped sensor camera. As several others have already commented, the answer is “no”. We cannot change the focal length of the lens. What changes is the angle of view. It’s the same as taking a full frame shot (35mm) and cropping it. I don’t understand why this is still being an issue. Some pros are still saying that. Same with ISO being a change in the sensitivity of the sensor. Arghh!

Well, because that's what it LOOKS LIKE.

A 200 on a 1.6 crop sensor will LOOK LIKE a 320 on a full frame.

chapjohn Loc: Tigard, Oregon

In answer to the OP...NO! The crop has to do with what you see. There no possible way that a sensor can increase focal length. Misleading statements about the crop factor are usually made as a selling point by less honest camera sellers.

frankraney Loc: Clovis, Ca.

MT Shooter wrote:

Absolutely not.
A lens never changes. The only thing that "crop factor" tells you is what lens would need to be used on a full frame camera to get the exact same image as you get with your crop sensor camera at any specific focal length setting.
Your camera adds no increase in lens magnification, it only captures a portion of the circular image projected by that lens. This makes the lens "appear" to have more magnification, but in reality it does not.

frankraney Loc: Clovis, Ca.

will47 wrote:

If I am using a 150-600mm lens, and shooting at 600mm does this mean I am shooting at an actual focal length of 960mm?

Will, if you're shooting a crop camera and a lens made for that camera then no. The crop factor is just a comparison your 600 millimeter would get the same photo taken with a full frame at 960 mm but it's still a 600 on your camera.

Longshadow Loc: Audubon, PA, United States

chapjohn wrote:

In answer to the OP...NO! The crop has to do with what you see. There no possible way that a sensor can increase focal length. Misleading statements about the crop factor are usually made as a selling point by less honest camera sellers.

It doesn't physically increase the focal length, it's a perception.
But that's the way it LOOKS, that's why it is referred to that way.

PHRubin Loc: Nashville TN USA

ggab wrote:

Begging to disagree. br Some assumptions: br 1-Cro... (show quote)

I beg to differ. Both height and width are reduced by 1/1.6 or 0.625. So the number of pixels used for the 20MP cropped FF is 20/(0.625)²=7.8MP. That is much worse a penalty than you indicated.

While the AOV is equivalent to a 960mm on a FF, the depth of field is unaffected. It stays that of a 60mm lens.

PHRubin Loc: Nashville TN USA

Longshadow wrote:

Well, because that's what it LOOKS LIKE.

A 200 on a 1.6 crop sensor will LOOK LIKE a 320 on a full frame.

Only as far as magnification, DOF does not.

CHG_CANON Loc: the Windy City

If your sensor throws away 60% of the frame, how will you ever achieve your potential as a photographer?

TV714

PHRubin wrote:

I beg to differ. Both height and width are reduced by 1/1.6 or 0.625. So the number of pixels used for the 20MP cropped FF is 20/(0.625)²=7.8MP. That is much worse a penalty than you indicated.

While the AOV is equivalent to a 960mm on a FF, the depth of field is unaffected. It stays that of a 60mm lens.

You mean 20*(0.625)^2=7.8MP. Which is the same thing I wrote when I said 20/(1.6)^2=7.8MP.

PHRubin Loc: Nashville TN USA

TV714 wrote:

You mean 20*(0.625)^2=7.8MP. Which is the same thing I wrote when I said 20/(1.6)^2=7.8MP.

I was correcting ggab. You were correct.