[bezuidar]

Hi there

Just a question. I have added this lens to my K20D with a Kenko x2 converter.

The camera only pics up the focal length at 135mm and not 270mm as it should be with a x2 converter.

I have set the camera at Av priority, F8. Because the camera can only read focal length 135mm instead of 270mm, is my F-stop F8 or F16 now? Fotos taken shows quite a lot of depth of field...

thanks

Bezuidar

[Adam]

You lose two effective stops with a 2x TC, so when your lens is at F8, the effective aperture is indeed F16. The DOF will be greater, but the effect isn't that dramatic due to the increased focal length.

[bezuidar]

Thanks for the info, make sense!