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70d crop factor
- Thread starter soapstar
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- canon eos 70d
It's the Canon version of the APS-C format. It's a smaller size than that of the classic 35mm footprint. Full frame sensors are roughly the same size as a frame of 35mm film 36 x 24mm whereas APS is about 24 x 15 mm The crop factor is still the same for the 70D it is just that the image sensor has more MP crammed onto it.
Just Google APS-C and see all the different configs (there is also APS- H and 4/3 etc etc)
Just Google APS-C and see all the different configs (there is also APS- H and 4/3 etc etc)
Karl Gnter Wnsch
Forum Pro
Not quite right, the 70D sensor is a few tenths of a millimeter larger in size.
Lemming51
Forum Pro
Because the "Crop factor" of 1.6x is approximate, it is only given to 1 decimal place. The prior sensor size of 22.2 x 14.8 has a crop factor of 1.6216 (ratio of diagonal measures = 43.2666 / 26.6811). Calling it 1.6x is close enough for government work. The new sensor of 22.5 x 15 has a crop factor of 1.6000 (=43.2666 / 27.0416).
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Unapologetic Canon Apologist
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Lemming51
Forum Pro
It's still a 1.6 crop factor APS-C sensor so who really cares.
50mm is 80mm etc.after you roughly calculate the 1.6 so why confuse the thread with adding in some formula that makes no difference in the real world (where I live) get over it!
50mm is 80mm etc.after you roughly calculate the 1.6 so why confuse the thread with adding in some formula that makes no difference in the real world (where I live) get over it!
DanCee
Senior Member
Lemming51
Forum Pro
We all agree it makes no practical difference. But the OP wanted to know why the 70D's sensor is spec'd with the same 1.6x crop factor as the smaller sensors of 60D and other models. You can't answer that without doing a little arithmetic.
Lemming51
Forum Pro
Karl Gnter Wnsch
Forum Pro
That is one thing they most certainly can not do - ever! The distance of the sensor with regards to the lens is fixed for all EF and EF-S lenses by the registration distance, a design parameter to which all lenses must adhere to! If that distance is not meticulously adhered to focusing fails.
The distance of the sensor with regards to the lens is fixed for all EF and EF-S lenses by the registration distance, a design parameter to which all lenses must adhere to! If that distance is not meticulously adhered to focusing fails.
I know what you are trying to say but it's the distance from the "lens mount" /mirror box sub assembly - to the sensor that is the critical element which in your case is the "design parameter" - hence the use of AF macro extensions or bellows that adjust the lens distance from the sensor but, guess what.....the focus will still acquire!
I know what you are trying to say but it's the distance from the "lens mount" /mirror box sub assembly - to the sensor that is the critical element which in your case is the "design parameter" - hence the use of AF macro extensions or bellows that adjust the lens distance from the sensor but, guess what.....the focus will still acquire!
Karl Gnter Wnsch
Forum Pro
Focusing at infinity will fail if the actual distance of the lens image side main plane is greater than the registration distance, minimum focusing distance will increase up to the point of total failure if the actual distance of the image side main plane of the lens is smaller than the registration distance. With today's floating focusing systems the likelihood of total failure for the latter case is extremely high.
Obviously the laws of physics apply with MFD but the relation of the sensor / "lens mount" is a fixed parameter however the lens optic "can" be further away from the sensor (with some degradation or improvement of IQ) which is not what you said before!
Karl Gnter Wnsch
Forum Pro
Wrong, if the lens optic is moved away (thus further away from its designed registration distance) infinity focus is lost (and depending on the focal length and the amount of extension added the focusing distance can reside within the lens), which is exactly what I said. Anyhow the idea that you can take an existing lens and change lens to sensor distance to increase the image circle size (which the post I originally replied to suggested) while retaining full function of the lens for its normal use is absolutely and irrefutably impossible!
DanCee
Senior Member
Karl Gnter Wnsch
Forum Pro
No, just the reverse, the image circle of both EF and EF-S lenses is big enough to cover even the slightly larger sensor variants...
I do NOT recommend you try this!
But, at least in terms of the EF-S 10-22 it would appear the image circle is large enough for even an APS-H sized sensor.
Lemons into Lemonade: The 10-22 'EF-S' on a 1D...
But, at least in terms of the EF-S 10-22 it would appear the image circle is large enough for even an APS-H sized sensor.
Lemons into Lemonade: The 10-22 'EF-S' on a 1D...
WilbaW
Forum Pro
Wrong. You said "focusing fails", absolutely and unqualified. That's not true.
That's correct, but you didn't specify the circumstances so it's not what you said.
A gentleman would apologise and acknowledge that he didn't express himself clearly, rather than persist with trying to make the other be the one in the wrong.
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