Explain this please 100/400L

sureshot

sureshot

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Both my MKI and MKII versions are sensor limited (way sensor limited, way way way way way sensor limited) when it comes to sharpness (5D MKIII).

This was a quote from a guy that had a Canon 100/400 mk2 but couldn't understand the above ?
 
No idea unless it means the lenses needed to be micro adjusted to the camera body. Not unusual.
 
Just sounds like he's saying the lens will out-resolve the sensor, which means as higher megapixel cameras are released you will see increased benefit with your lenses.
 
That makes sense.
 
Wonder how he can tell,cant have seen any better IQ than current sensors can record.
 
mikew said:
Wonder how he can tell,cant have seen any better IQ than current sensors can record.
Click to expand...

Tests are done on the lenses without sensors for the DxO charts I believe.

The resolution (sharpness) is measured for the lens alone.
 
Theory then,no proof new sensors would be able to use the extra supposed IQ
 
Not a fan of lens scores of any sort,would rather see what owners can do with them.
 
mikew said:
Theory then,no proof new sensors would be able to use the extra supposed IQ
Click to expand...
Sensor limited doesn't prove a better sensor would resolve more, simply that the lens is capable of resolving more.

However common sense and principals of physics tell us that a higher resolution sensor will out resolve a lower res sensor all things being equal.
 
It's not overly difficult to come up with a comparison as opposed to specific figures for resolution. When a lens is moved away from the sensor, the image circle diameter (at the sensor plane) is increased by virtue of capturing the divergent rays at a greater distance.....just as we do to increase the magnification of a macro lens.

If we take a lens that has a maximum magnification of 0.2x and add enough extension to produce 0.4x at the sensor then we can perform some basic observations to see if the second image has more detail than the first....suitable chart and software to hand. There are other factors coming into play but one can often prove a statement to be right or wrong with the simplest of tests.

I can't offer specifics about the 100-400's (I've never used them) but if they do out-resolve a 5D2/5D3 sensor then they have a far higher resolving power than some of the higher resolving lenses that I own.

Bob
 
sureshot said:
Both my MKI and MKII versions are sensor limited (way sensor limited, way way way way way sensor limited) when it comes to sharpness (5D MKIII).

This was a quote from a guy that had a Canon 100/400 mk2 but couldn't understand the above ?
Click to expand...

"way way way way way sensor limited" betrays someone with arithmetic comprehension problems trying to express an arithmetical concept they don't understand in words. The whole concept of sensor limited resolution suggests some kind of hard limit, which is not how it works. Even a crap lens will resolve a bit more detail with a better sensor, just not nearly as much of an increase as you'll get with an excellent lens.
 
In terms of sharp lenses I wouldn't put any 4x zoom at the top of that list. That said even a crappy kit lens will offer better resolution on a bigger (more MP) sensor.

I suspect the 100-400 lens would give increased resolution on a more mp sensor but mainly in the central zone. I dont believe the 5dmk3 would be a limiting factor here though.
 
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