Superfast Macro Lens Anyone

[mikee boy]

Reverse mount this Superfast Lens for great Macro results.

I didn't know lenses came this fast!

[LukeBird]

I know it must be huge, but with nothing to guage it against it's difficult to imagine.
It must be seriously heavy as well...

[RobDickinson]

http://www.canon.com/camera-museum/camera/lens/s/d...


Its not that big or heavy.

[LukeBird]

RobDickinson said:

http://www.canon.com/camera-museum/camera/lens/s/d...


Its not that big or heavy.

605g for a 50mm Prime is quite a lot though...

[Tycho]

Slightly OT but what manufacturing differences are there between a fast 1.* lens and a normal 3.* lens? Is it just a premium price thing or are they more complex?

[RobDickinson]

Tycho said:

Slightly OT but what manufacturing differences are there between a fast 1.* lens and a normal 3.* lens? Is it just a premium price thing or are they more complex?

Well theres a LOT more glass, for a 50mm f2.0 needs a 25mm aperture, f1.0 needs 50mm so 4 times the areaish.

Its also only worth making if its made properly so it needs finer more precise elements, and usualy special aspherical elements too.

[Tycho]

RobDickinson said:

Tycho said:

Slightly OT but what manufacturing differences are there between a fast 1.* lens and a normal 3.* lens? Is it just a premium price thing or are they more complex?

Well theres a LOT more glass, for a 50mm f2.0 needs a 25mm aperture, f1.0 needs 50mm so 4 times the areaish.

Its also only worth making if its made properly so it needs finer more precise elements, and usualy special aspherical elements too.

Fair enough. Thanks for the explanation.