What Happens When U Put A Full Frame Lence On A Aps-c Sencer Camera
Bonesh • New Member • Posts: 2
Full-frame lens on a ingather sensor camera
Hi everyone!
I'm struggling a flake with understanding the crop sensor/full-frame in a specific example and would appreciate your help.
I do empathize that a full-frame lens on a total-frame camera is not the same as on a crop sensor camera. Simply are the numbers on the APS-C lens already 'calibrated' or does the same rule employ as well for these lenses?
So let'due south say I have a 50 mm APS-C lens and a fifty mm full-frame lens on a crop sensor photographic camera - will the focal length exist ~80mm on both lenses or is it 80 mm on full-frame and 50 on APS-C?
I hope that I explained my question clear enough and I thank you in accelerate.
MarshallG • Veteran Member • Posts: 8,351
Re: Full-frame lens on a ingather sensor camera
iv
The focal length does not change.
If you put a 50mm total frame lens on a crop sensor body, it is still a 50mm lens.
The crop cistron occurs because the smaller sensor in the camera but crops the image: Simply the central portion of the paradigm is exposed to the sensor, and the residuum is ignored, or "cropped out."
Y'all tin attain the same result with a full frame camera by simply cropping the epitome in Photoshop. if you crop an epitome and then enlarge the image, you will have magnified the image. That's why the magnification of a 50mm lens on a crop sensor body is equivalent to an 80mm lens on a total frame torso.
Canon EOS R5 Canon EF 50mm F1.4 USM Canon EF 85mm F1.8 USM Canon EF xvi-35mm F2.8L 2 USM Catechism Extender EF 1.4x II +3 more
Dem Bell • Contributing Fellow member • Posts: 805
Re: Full-frame lens on a crop sensor photographic camera
4
Bonesh wrote:
So let'southward say I accept a 50 mm APS-C lens and a l mm full-frame lens on a crop sensor photographic camera - will the focal length be ~80mm on both lenses or is it 80 mm on full-frame and l on APS-C?
Both lenses are fifty mm and will have the number "50" engraved on their barrels to bear witness it. That is their focal length: 50 mm.
If you attach either lens to your Canon APS-C camera, they volition give y'all the aforementioned bending of view. This bending of view is the same equally any hypothetical eighty mm lens would give on a full frame camera.
I hope that I explained my question clear enough and I give thanks you in accelerate.
selected answer This mail was selected equally the respond by the original poster.
FrancoD • Forum Pro • Posts: 17,249
Re: Total-frame lens on a crop sensor camera
1
it is really very simple to understand.
With the same lens, on FF you see the Light-green area , with DX you see the ruby-red area.
Re: Full-frame lens on a crop sensor camera
manufacturers alway (I think) refer to a total frame focal length when describing lenses, even if that lens cannot be used on FF
for example I have an APSC merely 35mm Macro, the focal length is 35mm but the field of view (al la pic above) ways it behaves similar a 50mm on APSC
Focal length is divers by the lens pattern, field of view is dicated past the sensor size - then if you could put my 35mm macro on a 4/three sensor camera it would behave like a 70mm
mclewis • Senior Member • Posts: 1,493
Re: Full-frame lens on a crop sensor camera
5
HappyCampers wrote:
manufacturers alway (I think) refer to a total frame focal length when describing lenses, fifty-fifty if that lens cannot be used on FF
Manufacturers ever put the actual focal length of the lens on their lenses. This has absolutely nothing to do with the sensor/film size. It is a physical property of the lens itself.
Re: Full-frame lens on a crop sensor camera
FrancoD wrote:
it is really very simple to sympathize.
With the same lens, on FF you see the Light-green area , with DX you see the cerise area.
And that area in carmine is very similar to what you would see over the whole frame if you put a 75mm lens on a FF photographic camera.
Re: Full-frame lens on a crop sensor camera
HappyCampers wrote:
manufacturers alway (I think) refer to a total frame focal length when describing lenses, even if that lens cannot be used on FF
While that may be true of manufacturers of APS-C and larger format cameras, information technology is not ever true of makers of smaller format systems. Many of these will refer to their lenses in FF equivalent focal length (only never mention FF equivalent apertures). Even these manufacturers do engrave actual focal lengths on their lenses though.
for example I have an APSC merely 35mm Macro, the focal length is 35mm but the field of view (al la movie above) means information technology behaves like a 50mm on APSC
Focal length is divers by the lens design,
field of view is dicated by the sensor size
and its interaction with the focal length. The interaction is predictable The field of view on a smaller format than FF is e'er the same every bit that of a lens on FF whose focal length is equal to the focal length of the lens used on the smaller format multiplied past the diagonal dimension of a FF sensor and divided by the diagonal dimension of the smaller sensor. This ratio of sensor diagonals is chosen the "crop factor".
- so if you could put my 35mm macro on a 4/3 sensor camera it would behave like a 70mm
Re: Full-frame lens on a ingather sensor camera
The ingather gene applies to the camera, information technology has zippo to practice with the lens. The lens does not change, the focal lengths is a fundamental holding of the lens. it is e'er the focal length written on it.
If information technology's a 50mm lens, it's a 50mm lens on FF, and it's a 50mm lens when on APS-C.
Thinking the lens changes because it's put on a dissimilar body causes all sorts of confusion similar you have.
What changes when you lot put the lens on a dissimilar format photographic camera is the angle of view, as illustrated by a previous reply. The crop factor is telling you is you lot use a different format camera, how much yous'd need to alter the lens by to keep the angle of view the aforementioned.
So if you have an APS-C photographic camera with a 1.6x ingather, and a certain lens (50mm in your instance). If you wanted to have something which looked the aforementioned on full frame, yous'd need a lens which was i.6x longer (had a 1.6x focal length), that is you'd need an 80mm lens to do the same job. That's telling y'all near the camera, not the lens.
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Re: Full-frame lens on a crop sensor photographic camera
Bonesh wrote:
Hullo everyone!
I'm struggling a bit with understanding the ingather sensor/full-frame in a specific case and would capeesh your assistance.
I do understand that a total-frame lens on a full-frame camera is not the aforementioned as on a crop sensor camera. But are the numbers on the APS-C lens already 'calibrated' or does the same dominion use also for these lenses?
And then permit's say I have a 50 mm APS-C lens and a 50 mm total-frame lens on a crop sensor camera - volition the focal length be ~80mm on both lenses or is it eighty mm on full-frame and fifty on APS-C?I hope that I explained my question clear enough and I cheers in advance.
The key trouble is that "focal length" is not a proficient style of describing "angle of view".
Focal length is a physical property of the lens, and is independent of the sensor size. A 50mm lens is always 50mm, no matter which torso information technology is mounted on (and even if it is not on any body).
Angle of view is adamant by both focal length and sensor size.
A 50mm lens on a full frame body will yield a 47° angle of view. That same lens on a 2X crop body will yield a 24° angle of view. In both cases the focal length remains 50mm.
The difference betwixt a 50mm full frame and 50mm ingather torso lens is non related to the angle of view. It has more to do with "vignetting". The ingather trunk lens will probable vignette more, just the divergence won't be noticeable on a crop torso.
For historical reasons, Angle of View is oftentimes expressed in terms of the corresponding focal length for a 35mm film SLR.
For instance a 100mm lens on a 35mm film SLR yields a 24° angle of view. Therefore whatsoever combination of lens/body that results in a 24° angle of view, may be called "100mm equivalent"
A 50mm lens on a 2X crop body is one combination that yields that 24° angle of view. Therefore a 50mm lens on a 2X crop torso is sometimes called "100mm equivalent", even though the lens remains a 50mm focal length lens
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50mm f/1.4 = 50mm f/1.4 when mounted on the aforementioned camera.
Bonesh wrote:
Howdy anybody!
I'm struggling a bit with understanding the crop sensor/full-frame in a specific case and would appreciate your help.
I do empathize that a full-frame lens on a full-frame camera is not the aforementioned every bit on a ingather sensor photographic camera. But are the numbers on the APS-C lens already 'calibrated' or does the aforementioned rule apply also for these lenses?
So let's say I have a fifty mm APS-C lens and a 50 mm total-frame lens on a crop sensor camera - will the focal length be ~80mm on both lenses or is it eighty mm on full-frame and 50 on APS-C?I hope that I explained my question clear plenty and I thank you in advance.
A 50mm FF lens mounted on an APS-C camera will requite the same angle of view every bit a 50mm APS-C lens mounted on an APS-C camera (plus or minus slight differences betwixt the actual focal length and marked focal length -- e.g. one 50mm lens might actually be 48mm and another might actually exist 52mm).
In addition, the f-numbers volition have the same effect. For instance, a 50mm FF lens at f/1.4 on the APS-C camera will result in the same exposure as a 50mm APS-C lens at f/one.4 on an APS-C photographic camera (barring in differences in t-stops and vignetting -- due east.g. ane lens might be t/1.8 at f/1.4 and another t/1.vi at f/1.4; one might accept ii stops of vignetting at f/1.4 and some other might have 3 stops of vignetting at f/i.four).
If, still, nosotros mounted a 50mm APS-C lens on a FF camera, the image circle may not be large plenty to comprehend the entire sensor. However, if the epitome circle were big enough, all the above applies.
Re: 50mm f/one.4 = 50mm f/1.4 when mounted on the same camera.
Great Bustard wrote:
Bonesh wrote:
Hi everyone!
I'thousand struggling a flake with understanding the crop sensor/full-frame in a specific case and would capeesh your help.
I practice sympathize that a total-frame lens on a full-frame camera is not the same as on a ingather sensor camera. But are the numbers on the APS-C lens already 'calibrated' or does the aforementioned dominion apply too for these lenses?
So let's say I have a fifty mm APS-C lens and a 50 mm full-frame lens on a ingather sensor camera - will the focal length be ~80mm on both lenses or is it fourscore mm on full-frame and l on APS-C?I hope that I explained my question articulate plenty and I thank you in advance.
A 50mm FF lens mounted on an APS-C camera volition give the aforementioned angle of view as a 50mm APS-C lens mounted on an APS-C photographic camera (plus or minus slight differences between the actual focal length and marked focal length -- e.g. 1 50mm lens might really exist 48mm and another might actually exist 52mm).
In addition, the f-numbers volition accept the aforementioned event. For example, a 50mm FF lens at f/1.iv on the APS-C camera will result in the aforementioned exposure every bit a 50mm APS-C lens at f/1.iv on an APS-C photographic camera (barring in differences in t-stops and vignetting -- e.yard. one lens might exist t/1.8 at f/1.four and another t/1.6 at f/1.4; one might have two stops of vignetting at f/1.4 and some other might have 3 stops of vignetting at f/1.4).
f/1.4 will provide the same exposure (low-cal per unit surface area), but I would non say it has the same effect.
At the aforementioned exposure, overall paradigm noise tends to become down as sensor size increases. Thus f/1.4 on a smaller sensor tends to yield a noisier image than f/ane.four on a larger sensor.
Focal length does non change with sensor size, just the effect on angle of view does.
Aperture does not change with sensor size, only the effect on overall paradigm noise does.
If, however, we mounted a 50mm APS-C lens on a FF camera, the epitome circumvolve may not be large enough to cover the unabridged sensor. Withal, if the image circle were big enough, all the to a higher place applies.
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Re: 50mm f/1.4 = 50mm f/1.4 when mounted on the same camera.
Michael Fryd wrote:
Great Bustard wrote:
Bonesh wrote:
Hi everyone!
I'm struggling a fleck with understanding the ingather sensor/total-frame in a specific instance and would appreciate your help.
I practise understand that a full-frame lens on a full-frame camera is not the aforementioned equally on a crop sensor photographic camera. But are the numbers on the APS-C lens already 'calibrated' or does the aforementioned rule apply too for these lenses?
Then allow's say I have a 50 mm APS-C lens and a 50 mm full-frame lens on a crop sensor camera - will the focal length be ~80mm on both lenses or is it 80 mm on full-frame and fifty on APS-C?I hope that I explained my question clear plenty and I cheers in advance.
A 50mm FF lens mounted on an APS-C camera will requite the same angle of view equally a 50mm APS-C lens mounted on an APS-C camera (plus or minus slight differences betwixt the actual focal length and marked focal length -- e.yard. ane 50mm lens might really be 48mm and another might really exist 52mm).
In add-on, the f-numbers volition take the aforementioned effect. For case, a 50mm FF lens at f/ane.4 on the APS-C photographic camera will effect in the same exposure as a 50mm APS-C lens at f/1.four on an APS-C photographic camera (barring in differences in t-stops and vignetting -- e.m. one lens might be t/one.eight at f/1.4 and another t/1.six at f/1.4; one might have 2 stops of vignetting at f/1.iv and another might accept 3 stops of vignetting at f/1.4).
f/1.four will provide the same exposure (light per unit surface area), but I would not say it has the same upshot.
At the same exposure, overall image noise tends to go downwards equally sensor size increases. Thus f/1.4 on a smaller sensor tends to yield a noisier image than f/1.4 on a larger sensor.
Focal length does not alter with sensor size, simply the event on angle of view does.
Discontinuity does not modify with sensor size, but the effect on overall image noise does.
I was talking about 2 50mm lenses, one designed for FF, the other designed for APS-C, both mounted on an APS-C camera (but not at the same time, obviously!) as opposed to talking about a 50 / ane.four on a FF camera vs a fifty / 1.4 on an APS-C camera.
OP Bonesh • New Member • Posts: 2
Re: Full-frame lens on a crop sensor camera
Cheers everyone for clearing up my confusion!
I'll accept to swoop deeper into how cameras are made, just for now I learned what I wanted to know.
Source: https://www.dpreview.com/forums/thread/4563521
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