Focus test for telephoto zoom lens - please advice


rickosw

New Member
Apr 15, 2009
8
0
0
#1
Hi everyone,

I am thinkin of getting Tamron 70-300mm F4-5.6 Di VC USD to supplement my day to day Sigma 17-70mm F2.8-4 OS HSM on my Canon 60D.

I would like to ask if there are any "autofocus tests" that i need to perform on this telephoto zoom lens?

I have come across this focus test but i am unsure if this test can be applied to telephoto zoom lens as well....
http://focustestchart.com/focus21.pdf

another focus test i can think of is the "front / back focus" test...

are there other aspects that i should look out for when buying a telephoto zoom lens?

Best Regards!
 

Octarine

Moderator
Staff member
Jan 3, 2008
12,518
32
48
Pasir Ris
#2
The focus test charts is meant for auto focus tests. Errors in manual focusing are .. well .. your own errors :)
The focus test chart is for all kinds of lenses, but should be done at minimum focus distance (read the specs, it's listed there). Some telephoto lenses have quite a long MFD (1.5m). You will need some space and also a tripod. Read the instructions.
But on the other hand: if you buy a set with local warranty then focus errors are covered. Bring it for calibration if necessary.
 

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