APS-C Confused By Lens Descriptions

[timm]

I'm confused by some of the lens descriptions on vendor sites. It's my understanding that the Canon RF-S series lenses are made for the APS-C cameras, and the focal lengths marked are what you get. If you choose an RF series lens for a camera such as my R100, the focal length marked on the lens should be multiplied by the crop factor of 1.6 to get the effective focal length.

Some sites, B&H is one, state that a lens such as the RF-S55-210mm f/5-7.1 IS STM lens will effectively be an 88-336mm equivalent focal length range. The telephoto zoom lens is designed for APS-C-format EOS R-series mirrorless cameras.

Can anyone help clarify this?

Tim

 

[PKM-UK]

Hi Tim,

Simon d'Entremont explains matters surrounding 'crop vs full frame' far better than I ever could - YouTube link Here.


(Basically, manufacturers mark all lenses with their actual focal length not the equivalent/ perceived 'cropped' focal length - so B&H are correct, you should take the marked/ actual focal length and multiply that by 1.6 to understand what you will see/ experience when you use it on your R100).

Phil

 

[timm]

Hi Tim,

Simon d'Entremont explains matters surrounding 'crop vs full frame' far better than I ever could - YouTube link Here.


(Basically, manufacturers mark all lenses with their actual focal length not the equivalent/ perceived 'cropped' focal length - so B&H are correct, you should take the marked/ actual focal length and multiply that by 1.6 to understand what you will see/ experience when you use it on your R100).

Phil

Simon d'Entremont's video was excellent. Thank you!

Tim

 

[MrSparks999]

Simon, explains everything in an easy to understand way. I have learnt a lot from his videos.