EF lens adapter on mirrorless body

[pwsusi]

Like many i have a bunch of EF lenses, and I'm going to make the switch to a mirrorless body. What effect (if any) will the adapter have on focal length for my existing lenses. For example, the EF 11-24 L..will i still get 11mm or is this essentially like putting on an extension tube which is going to change the focal length. I may sell my 24-70 and buy and RF, but many of the lenses i have aren't available RF mount yet (not to mention the expense in doing this).

Thanks.

 

[Loswr]

An adapter will never change the focal length – that’s intrinsic to a lens.

The angle of view (or if you prefer, the equivalent focal length) changes with sensor size. So, if you adapt your 11-24 to a FF MILC it remains 11-24mm, but if you adapt it to an EOS M the equivalent would be 17-38mm, if you adapt to a m4/3 MILC it would be equivalent to 22-48mm, etc.

 

[Kit.]

is this essentially like putting on an extension tube which is going to change the focal length.

An extension tube does not change the focal length of the lens(*). It changes the range of focusing distances.

*) as long as the lens itself does not change its angle of view while focusing

 

[pwsusi]

Thanks. So as long as the mirrorless camera is also full frame it sounds like I'd be fine. Moving to something like APS-C would be a different story.

 

[Kit.]

With RF body, more than fine. You will be able to use your 11-24 with a filter adapter (CPL or variable ND), if you wish so.