Canon Community Canon Community
 


Reply
Highlighted
VIP
Posts: 12,744
Registered: ‎12-07-2012

Re: Canon extender with Tamron lens question

Keep in mind, using a tele-con does not change the physical aperture. You are magnifying an image that is already projected by the lens. The physical aperture is unchanged so the depth of field is unchanged.

EOS 1DX and 1D Mk IV and several lenses!
Highlighted
Esteemed Contributor
Posts: 4,046
Registered: ‎02-17-2016

Re: Canon extender with Tamron lens question

[ Edited ]

Since the "circIe of confusion" is changed, I think that the DOF is changed too, just like the fact that the DOF changes when you use the same lens on FF vs APS-C.

 

ETA:

This is wrong, the change in depth of field is entirely due to the effective increase of the focal length.

Highlighted
VIP
Posts: 12,744
Registered: ‎12-07-2012

Re: Canon extender with Tamron lens question

You are talking sensor. I am talking lens.

EOS 1DX and 1D Mk IV and several lenses!
powered by Lithium

LIKE US on Facebook FOLLOW US on Twitter WATCH US on YouTube CONNECT WITH US on Linkedin WATCH US on Vimeo FOLLOW US on Instagram SHOP CANON at the Canon Online Store
© Canon U.S.A., Inc.   |    Terms of Use   |    Privacy Statement