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Cameras forum

General discussion

extenders?

by edge8 / December 31, 2004 2:39 AM PST

what does it means when they say that a lens (prime 135mm)is "Compatible with Extender EF 1.4x II and 2x II" and what does it do?

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extenders
by snapshot2 Forum moderator / December 31, 2004 5:44 AM PST
In reply to: extenders?

I am having to guess a bit here.
A source of your information would be helpful.
Also brand names.

"prime 135mm" means a no-zoom lens with a focal length of 135mm.

"Extender EF 1.4x II and 2x II" most likely means an optical multiplier that goes between the lens and the camera.
Such as shown at this link:


http://www.beachcamera.com/shop/product.asp?ref=Google-BCAU01&sku=CN2X


The 2X extender will turn a 135mm lens into a 270mm lens. However, there is a penalty. You will also reduce the effective f-stop of that 135mm lens by two stops. If the 135mm lens is F5.6 it will then only function as F11. If it was F4 it would function as F8. You will need a very bright day to use the extender.

From personal experience you are likly to encounter some degree of softening of the corners of the picture. And the depth of field becomes quite narrow.

...
..
.

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extenders
by edge8 / December 31, 2004 10:20 AM PST
In reply to: extenders

i got that info from
http://www.fredmiranda.com/reviews/showproduct.php?product=34&sort=7&thecat=2
i have a couple of f4L lenses(17-40, 70,200)and thinking of shifting to faster lenses (i shoot mostly indoors) but long telezooms are a bit pricey. i'm looking at Tamron 17-35F/2.8, 28-75F/2.8, canon 135mm F/2L (270mm with extender?) and maybe sigma 15mm F/2.8 ex fisheye to replace the L's?. thanks snapshot2

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extenders
by edge8 / December 31, 2004 10:22 AM PST
In reply to: extenders

i got that info from
http://www.fredmiranda.com/reviews/showproduct.php?product=34&sort=7&thecat=2
i have a couple of f4L lenses(17-40, 70-200)and thinking of shifting to faster lenses (i shoot mostly indoors) but long telezooms are a bit pricey. i'm looking at Tamron 17-35F/2.8, 28-75F/2.8, canon 135mm F/2L (270mm with extender?) and maybe sigma 15mm F/2.8 ex fisheye to replace the L's?. thanks snapshot2

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