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200 - 400mm zoom

buffalobreath
Occasional Contributor

Does the built-in 1.4x extender make the lens 280 - 560mm or is the extender to get the 200-400?  Thanks.

1 ACCEPTED SOLUTION

ebiggs1
Forum Elite

"Does the built-in 1.4x extender make the lens 280 - 560mm or is the extender to get the 200-400?"

 

The lens is a 200-400 is a 200-400 is a 200-400 and will always be a 200-400.  It can not change its physical focal length after being made.  The 1.4x gives it the appearent AOV of a 280-560.

A 1.4x Extender simply multiplies the effective lens focal length by 1.4x.

EB
EOS 1DX and 1D Mk IV and several lenses!

View solution in original post

6 REPLIES 6

cicopo
Esteemed Contributor

Your first set of numbers are what it becomes.

"A skill is developed through constant practice with a passion to improve, not bought."

ebiggs1
Forum Elite

"Does the built-in 1.4x extender make the lens 280 - 560mm or is the extender to get the 200-400?"

 

The lens is a 200-400 is a 200-400 is a 200-400 and will always be a 200-400.  It can not change its physical focal length after being made.  The 1.4x gives it the appearent AOV of a 280-560.

A 1.4x Extender simply multiplies the effective lens focal length by 1.4x.

EB
EOS 1DX and 1D Mk IV and several lenses!

View solution in original post

buffalobreath
Occasional Contributor

Thanks guys for the help.  I wasn't sure on that.  Man Happy

RobertTheFat
Honored Contributor

@ebiggs1 wrote:

"Does the built-in 1.4x extender make the lens 280 - 560mm or is the extender to get the 200-400?"

 

The lens is a 200-400 is a 200-400 is a 200-400 and will always be a 200-400.  It can not change its physical focal length after being made.  The 1.4x gives it the appearent AOV of a 280-560.

A 1.4x Extender simply multiplies the effective lens focal length by 1.4x.


Or to put it more familiar terms: The [effective] focal range of the lens/extender combination is 280-560 mm. (I say this with no intent to denigrate Ernie's often-expressed preference for AOV as the figure of measure. It just isn't the way most users are programmed to see it.)

Bob
Philadelphia, Pennsylvania USA

TTMartin
Respected Contributor

The EF 200-400mm f/4L IS USM Extender 1.4X is a high-performance super telephoto zoom lens with an optically matched built-in 1.4x extender. With a flick of a switch, the zoom range can be quickly increased to 280-560mm (f/5.6).

 

EF 200-400mm f/4L IS USM Extender 1.4x

ebiggs1
Forum Elite
To get really technical the focal length does get a tad bit longer. It is just a small amount but is does happen. When you move the focus point farther from the focal plane something has to change.
EB
EOS 1DX and 1D Mk IV and several lenses!