Crop factor question
Oct 28, 2014 22:37:07 #
I always here where people say a crop sensor will give a 300mm lens an equivalent focal lenth of 480 (1.6x300). Would not the focal length still be the same, you would only be using the center part of the lens. If you crop the full frame photo in post processing, would you not have the same result. Thanks and all comments welcome.
Oct 28, 2014 22:42:55 #
Great question, I can't wait for all of the responses along with all of the math, pixels, etc. Better stand back before you get run over! Also, you might want to search for "crop factor" at the top of the page and see what a deluge you get. This should be fun...
Oct 28, 2014 22:46:47 #
Yes, but the sensor is also smaller so if the MP count is the same then the cropped FF will have a lower pixel count. Thus while the coverage will be the same, the detail etc. will not.
bibsthecat wrote:
I always here where people say a crop sensor will give a 300mm lens an equivalent focal lenth of 480 (1.6x300). Would not the focal length still be the same, you would only be using the center part of the lens. If you crop the full frame photo in post processing, would you not have the same result. Thanks and all comments welcome.
Oct 28, 2014 22:47:17 #
DavidPine
Loc: Fredericksburg, TX
robertjerl wrote:
Yes, but the sensor is also smaller so if the MP count is the same then the cropped FF will have a lower pixel count. Thus while the coverage will be the same, the detail etc. will not.
:thumbup: :thumbup: :thumbup:
Oct 28, 2014 23:02:24 #
Back when you were using a 6 mp sensor, that might have made a difference, but not with the sensors of today, there is no shortage of MP's.
Oct 28, 2014 23:28:47 #
bibsthecat wrote:
I always here where people say a crop sensor will give a 300mm lens an equivalent focal lenth of 480 (1.6x300). Would not the focal length still be the same, you would only be using the center part of the lens. If you crop the full frame photo in post processing, would you not have the same result. Thanks and all comments welcome.
Yes, and yes ....cropping will give you the same field of view ( FOV) - that is what the "crop factor" alludes to - an equivilent full frame field of view.
Oct 28, 2014 23:33:10 #
Oct 28, 2014 23:53:11 #
Depends on how how big you want to print. At large print sizes the MPs start to run out real fast.
topcat wrote:
Back when you were using a 6 mp sensor, that might have made a difference, but not with the sensors of today, there is no shortage of MP's.
Oct 28, 2014 23:58:49 #
In this article, go down to the illustration with the circle and read the paragraph starting just above it. That will pretty well explain things.
http://www.meetyourcamera.com/2010/full-frame-lens-on-cropped-sensor/
http://www.meetyourcamera.com/2010/full-frame-lens-on-cropped-sensor/
Oct 29, 2014 00:46:56 #
robertjerl wrote:
Yes, but the sensor is also smaller so if the MP count is the same then the cropped FF will have a lower pixel count. Thus while the coverage will be the same, the detail etc. will not.
I agree but if a crop sensor and a full frame sensor have the same pixel count, would not the pixels on the full frame be larger and contain more information. If not you could use a point and shoot with the same pixel count. Would not a lower pixel count on a full frame maybe be better than a higher count on a point and shoot. Just wondering.
Oct 29, 2014 01:03:51 #
Oct 29, 2014 01:28:28 #
bibsthecat wrote:
I agree but if a crop sensor and a full frame sensor have the same pixel count, would not the pixels on the full frame be larger and contain more information. If not you could use a point and shoot with the same pixel count. Would not a lower pixel count on a full frame maybe be better than a higher count on a point and shoot. Just wondering.
Cats are so curious.....Hi Bibs!
Then there is the generation of the sensor ....and the maker....I know, I know mostly Sony ...but still......then there is the hardware and software that processes the pixel info being gathered ....and so on :XD:
....too many pixels, too little time ..... 8-)
Oct 29, 2014 02:03:43 #
amehta
Loc: Boston
bibsthecat wrote:
I always here where people say a crop sensor will give a 300mm lens an equivalent focal lenth of 480 (1.6x300). Would not the focal length still be the same, you would only be using the center part of the lens. If you crop the full frame photo in post processing, would you not have the same result. Thanks and all comments welcome.
You are right. The "extra reach" is a mythical meme.
Oct 29, 2014 02:18:37 #
amehta wrote:
You are right. The "extra reach" is a mythical meme.
Dont crop sensor also receive less light coming to them (compared to full frame)?
Oct 29, 2014 02:22:16 #
bibsthecat wrote:
I always here where people say a crop sensor will give a 300mm lens an equivalent focal lenth of 480 (1.6x300). Would not the focal length still be the same, you would only be using the center part of the lens. If you crop the full frame photo in post processing, would you not have the same result. Thanks and all comments welcome.
Right. It doesn't magically transform one focal length into another...it just "pre-crops" in camera to a narrower field of view.
Not sure if it's exactly the same as doing it in post though...I think that the pixel count would be different.
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