Cropping Modes
Jun 22, 2021 13:24:25 #
Jun 22, 2021 13:25:37 #
Jun 22, 2021 13:31:37 #
Wow - terminology! I'm not sure what cropping modes are, nor what focal distance is. However, cropping does not affect anything about a lens, but does affect the resulting angle of view of the image as if the focal length had changed by the crop factor.
Jun 22, 2021 13:39:09 #
tca2267 wrote:
Does changing the cropping modes change the focal distance of the lens
No, the focal length of the lens remains the same, but the size of the image is increased so that it looks like the lens is a higher power. The closer the sensor is to the lens, the larger the image will appear because less of the outer perimeter of the image will hit the sensor.
Here's a question for someone out there. On a crop sensor camera, the sensor is placed closer to the end of the lens than on a full frame, so the image is optically larger because the sensor's placement effectively cuts the image off "early". But on a camera that has the ability to set full frame or crop sensor, the sensor can't be moved back and forth, so is the image size changed digitally rather than optically? If it is changed digitally, can I assume that it loses some IQ in the process and is not as good an image (as slight as the difference might be) as a true crop sensor camera would produce?
Jun 22, 2021 13:39:14 #
tca2267 wrote:
Does changing the cropping modes change the focal distance of the lens
No the focal length (I assume this is what you mean by “distance” stays the same. The field of view just becomes narrower. Think of it as cropping in camera rather than in computer. It took me a while to wrap my brain around it. I believe much of the confusion arises when we say equivalent to xx mm instead of field of vision equivalent to xx mm.
Jun 22, 2021 13:55:07 #
Jun 22, 2021 14:03:05 #
lowkick wrote:
No, the focal length of the lens remains the same,... (show quote)
Yes, the pixel count is cut by the crop factor SQUARED! For most that is 1/(1.5)² or down to 44.4% of the full sensor count.
Jun 22, 2021 14:14:47 #
lowkick wrote:
... br br Here's a question for someone out there... (show quote)
I would think that the "crop" setting would simply use the "center" portion of the sensor, ignoring the outer perimeter according to the crop factor.
I have one bridge camera that has multiple aspect ratio settings and I'll have to confirm, but I believe it masks out (grays) the viewfinder for what area of the sensor it will not be using.
Jun 22, 2021 16:11:50 #
Jun 22, 2021 17:32:34 #
lowkick wrote:
No, the focal length of the lens remains the same,... (show quote)
The sensor to back of lens distance is the same. It’s the size of the sensor that is different. Switching a full frame to its DX mode doesn’t move anything. It’s the tighter, smaller sensors that effect quality in a DX camera.
… Cam
Jun 23, 2021 04:49:48 #
tca2267 wrote:
Does changing the cropping modes change the focal distance of the lens
What is focal distance?
There is focal length which is the distance between the lens and the image sensor when the subject is in focus and focus distance, the space between the subject & the lens.
I have never heard of focal distance.
Jun 23, 2021 05:43:43 #
I got the impression the OP might have been talking about pre set cropping ratio's offered in editing like free, square, 3x5, 5x3 etc. and not the 'crop' factor.
If so, no it doesn't. You are only changing how you wish to view / display your image.
Could be wrong though.
If so, no it doesn't. You are only changing how you wish to view / display your image.
Could be wrong though.
Jun 23, 2021 06:03:10 #
billnikon
Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont
tca2267 wrote:
Does changing the cropping modes change the focal distance of the lens
No. It only changes perspective, rule of thirds, leading lines, subject mergers, center of interest, and every other rule of composition.
Jun 23, 2021 06:05:02 #
NikonRocks
Loc: Sydney
I have always viewed cropping an existing image as being akin to zooming in on a subject digitally and as mentioned previously the resultant image loses IQ. For cameras that have sensors that produce high resolution images, eg. D850, many photographers make use of that feature to crop images to compensate for not being able to get closer to their subject for one reason or the other.
Jun 23, 2021 07:27:49 #
John N wrote:
I got the impression the OP might have been talking about pre set cropping ratio's offered in editing like free, square, 3x5, 5x3 etc. and not the 'crop' factor.
If so, no it doesn't. You are only changing how you wish to view / display your image.
Could be wrong though.
If so, no it doesn't. You are only changing how you wish to view / display your image.
Could be wrong though.
Still cropped. Different "methods" - smaller sensor vs. using less of a larger sensor.
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.