Can I zoom in, lock focus, then zoom out and keep focus?

Started Mar 11, 2012 | Discussions thread
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CaseySRT
CaseySRT Regular Member • Posts: 136
Can I zoom in, lock focus, then zoom out and keep focus?

I'm legally blind so seeing the focus point on an eye is next to impossible, even more-so outdoors, here is my question.

Lets say I have a 70-200 lens and I want to take a picture at 100mm, can I zoom to 200mm, half press my shutter to lock focus, then while holding down my shutter button zoom back to 100mm and take the picture?

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