CROP SENSOR - I don't get it
Feb 18, 2019 12:36:10 #
DeanS wrote:
Forget all this “stuff”, grab a lens, mount it to your camera, shoot what you see. If the image is not large enough, zoom in, if still not large enough, get a longer lens, if still not large enough, get closer, if STILL not large enough, crop the damn thing. Problem solved.
Yeah that’s great advice...except...when I’m buying a new lens it’s very useful to know that a lens I’m buying for my D7200 will give me the same basic view as what I had with my 35mm film cameras. Knowing that my 35mm lens will give me approximately the same view as a 50mm on FF, or that my MFT will need a 25mm for the same thing is a good thing to understand. It certainly helps in deciding what lenses I want to buy or carry.
Feb 18, 2019 12:38:03 #
Blurryeyed wrote:
It is simply about the angle of view, a full frame sensor provides the full angle of view, so 100mm = about a 20 degree horizontal angle of view, on a crop sensor because the image in the focal plane is larger than the sensor in your camera it will not capture the entire image on the smaller sensor because a portion of image captured is cut off the same lens only captures about a 13 degree horizontal view which is the equivalent of the angle a 160mm lens would display on a full frame sensor.
I hope that more people will chime in to further complicate it. LOL
Feb 18, 2019 12:42:40 #
AndyH wrote:
Part of the problem in today's world is that
we want bumper sticker answers to complex
questions. Not so easy...
I'm pretty sure you'll agree with me on that.
Andy
Part of the problem in today's world is that
we want bumper sticker answers to complex
questions. Not so easy...
I'm pretty sure you'll agree with me on that.
Andy
I mostly agree and will not touch on any
small but numerous difference between
us, cuz then I might channel Tolstoy !
.
Feb 18, 2019 12:47:45 #
BebuLamar wrote:
If you use the lens designed for APS-C which are Canon EF-S, Nikon DX etc.. the image circle these lenses produce only just enough for the APS-C sensor and no more so what is there to crop?
You can choose to remain dense. It’s not called a crop sensor because of the image circle. It’s called a crop sensor because it is “cropped” in comparison to a FF sensor. It has absolutely nothing to do with the lens.
Feb 18, 2019 13:11:11 #
donrosshill wrote:
A good explanation. Thanks
I make it simple. I put on a lens, I focus, compose and if I can see what I want I shoot. It works.
Don
I make it simple. I put on a lens, I focus, compose and if I can see what I want I shoot. It works.
Don
Feb 18, 2019 13:16:33 #
SuperflyTNT wrote:
You can choose to remain dense. It’s not called a crop sensor because of the image circle. It’s called a crop sensor because it is “cropped” in comparison to a FF sensor. It has absolutely nothing to do with the lens.
Well, it will...
An APS-C specific lens will vignette on a full frame because of the image circle result of the lens design.
Feb 18, 2019 13:32:40 #
Now what does have to do with the lens is the crop factor. Parallel lens of light enter the front of the lens and coverage No matter if a lens is FF or DX or MFT, the focal length is the distance from the point of convergence to the sensor or film plane. The crop factor indicates how much of this image is captured by the sensor. Aside from any vignetting caused by other design characteristics, (i.e. being designed for a smaller sensor), the images at the sensor plane will be identical. How much of that image is captured is determined by the sensor size. The crop factor indicates the FOV, (Field of view) of that particular focal length lens provides for that sensor. A 100mm lens on a FF sensor would have an FOV of 20.4 anda crop factor of 1:1, or none. That same 100mm lens on a Nikon APS-C sensor would give you a narrower FOV of 13.3 giving you a crop factor of about 1.5:1, meaning that it will contain the same information as a 150mm lens would provide on a FF.
Feb 18, 2019 13:33:29 #
Longshadow wrote:
Well, it will...
An APS-C specific lens will vignette on a full frame because of the image circle result of the lens design.
An APS-C specific lens will vignette on a full frame because of the image circle result of the lens design.
Yes, but that doesn’t change the crop factor.
Feb 18, 2019 13:36:40 #
SuperflyTNT wrote:
Yes, but that doesn’t change the crop factor.
Correct. But a given lens can have different effects on a FF and crop camera, but not all lenses.
Feb 18, 2019 16:49:33 #
The Can Man
Loc: Big Arm, Montana
I hate the term Crop Sensor. It should be called image size sensor. There was an awesome chart a few weeks back when this same subject came up. I wish I would have saved it. It explained sensor from FF down to our cell phones. I will see if I can find it.
Feb 18, 2019 16:59:59 #
The Can Man
Loc: Big Arm, Montana
http://photoseek.com/2013/compare-digital-camera-sensor-sizes
Here’s a great chart to explain crop sensor.
Here’s a great chart to explain crop sensor.
Feb 18, 2019 17:03:37 #
The Can Man wrote:
http://photoseek.com/2013/compare-digital-camera-sensor-sizes
Here’s a great chart to explain crop sensor.
Here’s a great chart to explain crop sensor.
Haha. How to explain different <electronic> film sizes.
Feb 18, 2019 17:51:25 #
The Can Man
Loc: Big Arm, Montana
It is a great article to read. I thought I understood it till I saw that chart and read the essay. What I thought I knew was way wrong. Very glad I stumbled into it.
Feb 18, 2019 19:02:29 #
Retina wrote:
If there was not such a legacy of 35mm film camera usage, the terms Crop Factor or Full Frame equivalency would obviously not be around. Instead, some might keep a little chart of sensor size vs focal length for equivalent fields of view for each sensor size. Most people, if not everyone, would just get used to what various focal length lenses did on whatever camera we were using at the time.
"Full frame" is marketing-speak for what everyone used to call miniature format.
Maybe a Honda Civic is now a "full sized car". It is if that will sell more Hondas!
Fortunately, truth isn't detemined by advertising or popular usage. Because of physical
laws, different formats are optimal for different purposes. So onne needs to have the
right tool for the job. Different people need different size cameras just as they need
different sized cars--there is no "one size fits all".
The situation exists because it is very expensive to fabricate larger digital sensors.
Before, manufacuters didn't care whether customers bought large format, medium
format, or minature format cameras. Now large format is film-only (large format digital
sensor ICs do not exist), and meidum format image sensors are a very expensive part.
So it is in the manufactuer's interest to use the smallest sensor it can convince you
to buy. So "minature format" becaome "full frame".
Now some sellers are starting to refer to APS-C as "medium format digital".
This is how marketing works. I make a lot more money if i can sell you "orange
drink" for the same price as orange juice. But the FTC doesn't regulate cameras
to the same degree that it regulates food product labeling and advertising.
Most consumers are so clueless, they don't even know they are being manipulated
by advertisers.
Feb 18, 2019 19:05:17 #
Bipod wrote:
"Full frame" is marketing-speak for what... (show quote)
I dislike marketers/marketing for that very reason.
Their job is to make you want to buy something, even if you don't need it.
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