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Full frame versus cropped camera
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Aug 29, 2018 07:35:32   #
BebuLamar
 
epd1947 wrote:
Larger sensor size does not determine depth of field - at least directly. There are only three (3) things that do - aperture, camera to subject distance and focal length of the lens in use. Here is a simple experiment that can be done to prove the point. Place a subject a fixed distance from your camera - decide on a focal length to use as well as the aperture to be used. Now capture that image with a full frame camera. Changing only to a crop sensor body (not changing camera to subject distance, focal length or aperture) take another photo. How will the images differ? The image taken with the crop sensor camera will result in your subject being more prominent in the frame and will contain less of the surrounding area than in the image captured with the full frame body. Now study the main subject and objects closer to as well as farther from the camera in both images - you will clearly see that the depth of field in both images is exactly the same - the size of the sensor did not change the dof because we locked in the only three parameters that do.

So why do we have people still saying that the size of the sensor controls depth of field - it is actually because in trying to create the same framing of an image we need to either use a longer focal length lens on the full frame sensor camera, if we keep the same camera to subject distance - or - if we want to keep the same focal length we need to move closer to the subject when using the full frame body versus the crop sensor body to achieve the same image framing - using a longer focal length lens or moving in closer does result in less depth of field, all else being equal - so the best we can say is that sensor size affects our choice of focal length and/or camera to subject distance to achieve similar framing - so it is an indirect component only.
Larger sensor size does not determine depth of fie... (show quote)


Did you read carefully? I said "The larger sensor would also give shallower depth of field when taking images with the same angle of view and same aperture."
So I said when taking images with the same angle of view that means you must use a longer lens for the larger format.
Also I said the same aperture.

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Aug 29, 2018 08:01:56   #
Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)
 
chrisg-optical wrote:
A lens is a lens is a lens - the sensor size does not change the optical characteristics of any particular lens at a given focal length - the lens spits out an image at a predetermined distance from the lens onto the focal plane (sensor) - when in focus. Imagine a hypothetical digital camera with interchangeable backs - M43, APSC, FF, MF...assume the lens can cover at least the largest sensor (MF) and that the sensor is centered on the optical axis of the lens...focus the image on the focal plane. Now change the backs - rotate through the different size sensors...does the change of the backs alter the image in any way (except for cropping of course)....does this make sense?
A lens is a lens is a lens - the sensor size does ... (show quote)


Show me a dof chart that supports your opinion. There's more to this than just what the lens does. Image magnification - a factor totally absent in your representation - is important. Smaller sensors have smaller circles of confusion and for a given print size, the smaller sensor will expose image softness from shallower depth of field.

But I would like you to show, on any dof calculator, where the opposite, as you contend, is correct.

Similar to your example of a camera with interchangeable backs, TriX's screen captures above of DoF calculations for crop vs full frame, where the only thing changed is the sensor size, shows clearly that you may not have completely thought this through. But maybe we are both wrong. I am always open to learning something new. . .

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Aug 29, 2018 09:01:41   #
TriX Loc: Raleigh, NC
 
chrisg-optical wrote:
A lens is a lens is a lens - the sensor size does not change the optical characteristics of any particular lens at a given focal length - the lens spits out an image at a predetermined distance from the lens onto the focal plane (sensor) - when in focus. Imagine a hypothetical digital camera with interchangeable backs - M43, APSC, FF, MF...assume the lens can cover at least the largest sensor (MF) and that the sensor is centered on the optical axis of the lens...focus the image on the focal plane. Now change the backs - rotate through the different size sensors...does the change of the backs alter the image in any way (except for cropping of course)....does this make sense?
A lens is a lens is a lens - the sensor size does ... (show quote)


In the event you missed or don’t believe the examples I posted previously from a well-known DOF calculator, then you might find these 2 articles to be useful for explaining how depth of field is calculated and is affected by the circle of confusion (CoC) which is determined by format size:

https://en.m.wikipedia.org/wiki/Depth_of_field
https://en.m.wikipedia.org/wiki/Circle_of_confusion

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Aug 29, 2018 09:31:15   #
Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)
 
TriX wrote:
In the event you missed or don’t believe the examples I posted previously from a well-known DOF calculator, then you might find these 2 articles to be useful for explaining how depth of field is calculated and is affected by the circle of confusion (CoC) which is determined by format size:

https://en.m.wikipedia.org/wiki/Depth_of_field
https://en.m.wikipedia.org/wiki/Circle_of_confusion


Great articles!!!!

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Aug 29, 2018 12:07:28   #
HarryBinNC Loc: Blue Ridge Mtns, No.Carolina, USA
 
AlfredU wrote:
I agree with everything you said, except saying you get more reach with a 1.6x cropped sensor. If you crop your image from the same lens and crop the image 1.6 X in post you have the same reach with the full frame sensor.


Unfortunately, when you cropped your FF to get that "reach" you have also magnified the noise and other image issues, shrunk the depth of field, and reduced the pixels in the image by 60%! So where is the FF advantage now?

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Aug 29, 2018 14:18:57   #
Dossile
 
I really enjoyed shooting my Nikon 300S DX. I moved to full frame because I wanted the wider view on landscapes and to use higher quality low light (faster) lenses when doing so for less noise, higher dynamic range. That can be done several ways with the different formats, but my wife is always pushing forward when traveling and if I want a chance to take good pictures and yet hang with her I can’t take multiple images and splice in PS. I get one shot or two. I have some great 4/3 shots, some great Dx shots. The cameras are all amazing tools now in any format: 4/3, DX, APS/C, FF mirrorless and FF DSLR. I smile at people’s passion when defending a format because they are all extremely good. Most of the time, and for most of us, it is the magician not the wand. I upgraded my body to an 850, am slowly upgrading my lenses, but my next purchase is a high quality tripod to take advantages of the FF benefits.

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Aug 29, 2018 18:01:45   #
ken_stern Loc: Yorba Linda, Ca
 
Have an additional & final thought on the subject of Crop vs Full Frame and it goes back to a simpler analog time when formats were point & shoot (generally less then 35mm) 35mm; 70mm and view cameras. I love what can be accomplished -- in of course the right experience hands -- with the 70mm & larger formats -- did have a twin lens reflex once -- But eventually eliminated them as future purchases simply because I felt they & their lenses & associated "stuff" were too expensive & heavy. Didn't buy into the point & shoot simply because you could not change lenses. I built my 35mm lens collection primary based on what I got out of reading/rereading the Kodak Lens Book and then applied those purchased lenses to a series of Canon Film & Digital Cameras. For the most part I'm still using the same lenses. The above reasoning is why I did not go with what I then considered & of course continue to consider the far superior technology - Digital - Until 2010 - Those old sharp as a tack lenses are the only reason why I do not own a Crop Frame Camera.

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Aug 30, 2018 10:08:15   #
epd1947
 
BebuLamar wrote:
Did you read carefully? I said "The larger sensor would also give shallower depth of field when taking images with the same angle of view and same aperture."
So I said when taking images with the same angle of view that means you must use a longer lens for the larger format.
Also I said the same aperture.


You are correct - i missed your qualification on same angle of view - sorry

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Sep 6, 2018 12:31:44   #
gwilliams6
 
An interesting alternative to the fullframe mirrorless wars brewing. An excellent mirrorless APS-C new release from Fuji. And at a $1500 price it might be worth considering for many. Cheers

https://www.trustedreviews.com/news/fujifilms-x-t3-is-a-mirrorless-all-rounder-with-boosted-video-powers-embargoed-3552655

https://www.theverge.com/2018/9/6/17823930/fujifilm-xt3-camera-announced-features-pricing-release-date

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Sep 6, 2018 12:31:44   #
gwilliams6
 
An interesting alternative to the fullframe mirrorless wars brewing. An excellent mirrorless APS-C new release from Fuji. And at a $1500 price it might be worth considering for many. Cheers

https://www.trustedreviews.com/news/fujifilms-x-t3-is-a-mirrorless-all-rounder-with-boosted-video-powers-embargoed-3552655

https://www.theverge.com/2018/9/6/17823930/fujifilm-xt3-camera-announced-features-pricing-release-date

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Jun 16, 2023 19:08:56   #
davidb1879
 
Gene51: Which bridge camera with a 1 inch sensor do you use? By the way, thanks for all the good advice. Davidb1789.

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Jun 16, 2023 19:13:29   #
davidb1879
 
Gene51: Which bridge camera with a 1 inch sensor do you use. By the way, thanks for all your good advice over the years. Davidb1789.

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Jun 16, 2023 23:43:30   #
Orphoto Loc: Oregon
 
David. If you want to contact gene(who has not been active lately), send him a pm.

Otherwise, let a 5 YEAR OLD THREAD rest in peace.

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Jun 17, 2023 00:05:43   #
User ID
 
.

Starving here in UHH. Puny little brains.
Starving here in UHH. Puny little brains....
(Download)

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Jun 17, 2023 01:09:21   #
MDI Mainer
 
This is an old thread, but in 2023, the attraction of the "full-frame" format is largely snob appeal and/or a photographic form of size envy. The claimed disadvantages of today's APS-C and MFT sensors can now readily be addressed with state-of-the-art post-processing software.

History teaches that the "full-frame" or 35 mm format supplanted older, larger formats, such that these formats were reduced to a retarditare niche market. The real question is whether the advance in even smaller phone camera sensors and future software developments will again replicate this result.

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