PhotoPlus The Canon Magazine – August 2019

CANONSCHOOL

EOS S.O.S

Our technical guru is here to help. No Canon conundrum is too

big or small. Get in touch today at [email protected]

CANONSCHOOL

86 http://www.digitalcameraworld.com

BRIAN WORLEY

Canon Pro

Brian is a freelance photographer

and photo tutor, based in

Oxfordshire. He has unrivalled

EOS DSLR knowledge, after

working for Canon for over

15 years, and is on hand to

answer all your EOS and

photographic queries

Sigma 17-70mm DC lens at 17mm on the EOS R creates an almost circular image

Is it possible to preview

the depth of field when

using a EOS 200D?

Chloe Pointer, Erith

Brian SayS... It is possible to see a

preview of the depth of field on the EOS

200D, but you’ll need a change in the

custom functions to enable it. You’ll

need to turn the mode dial to one of the

creative zone modes, P, Tv, Av or M,

then press menu and choose function

settings. Navigate to the SET UP4 menu

and choose custom functions. Set C.Fn

9 to 7 to make the SET button a depth of

field preview button. It’s not easy to see

the depth of field in the viewfinder, but it

also works when

using Live View.

Select the aperture

you need and press

the SET button, you’ll

hear the aperture

close and see the

result.

C.Fn 9 changes the operation of the SET

button, here it’s used for DoF preview

Brian SayS... The Sigma 18-300mm

lens is a DC model, which is optimized for

cameras with APS-C sensors. This

makes them smaller and lighter, but

means they only need to image over the

area of the much smaller APS-C size

sensors. With an EF-EOS R lens adapter

you can fit these lenses to the mirrorless

EOS RP. I’ve found the lenses don’t

automatically inform the camera that

they are a crop lens. As the EOS RP is a

full-frame model you’ll see that the

edges of the frame are not covered by

the lens image area. Exact results vary

with the focal length in my experience.

If you fit a Canon EF-S lens, also

designed for crops, then the EOS R and

RP automatically activate 1.6x crop

mode, so there’s no black surround.

The solution for your Sigma lens, and

other independent brand APS-C

optimized lenses, is to select crop mode

manually on the camera. Crop mode is

found in the first of the SHOOT menus

for both EOS R and RP.

Why do my photos have a circular black border when

I use my Sigma 18-300mm lens on the EOS RP?

Simon Stinton, Bourne End

Set the crop mode to 1.6x when using lenses

designed for cameras with APS-C sensors

Ask Brian!

Confused with

your Canon DSLR?

Email EOSSOS@

futurenet.com