Tokina 100mm F2.8 D

**Roy1961** · 11-10-2020, 04:53 AM

Last weekend we went to Nevada for a few days and i lifted this lens to go, i took the 60-600 of the camera and put it in the bag and was going to carry the Tonika 100, for some reason i tried to take a shot with it and it wont auto focus, i hear a slight spinning. Worked ok the last time i had it on and it went straight into the cupboard afterwards. Manual works ok and i tried it on my D7000 too, same spinning sound and no auto focus.

And ideas what to look at?? or is it a send in to repair?

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**Bikerbrent** · 11-10-2020, 05:56 AM

If the lens was auto focusing on both cameras in the past and now it will not autofocus (plus the spinning sound), I think a trip to the lens doctor would be in order. One thing you might try first is a good cleaning of the lens contacts (fingers crossed!)

**Marcel** · 11-10-2020, 02:28 PM

If it is like my Sigma, it might have a focus switch on the lens. What this does is prevent the focusing screw to engage the lens. My Sigma's switch is the focusing ring that I have to move back and forth to engage/disengage.

Make sure it's not this before sending it in for repairs.

hope this can help.

**FredKingston** · 11-10-2020, 06:52 PM

What @Marcel said... Make sure the Focus AF/MF ring is in the correct position... and engaged correctly... It moves In and Out with a definite click... make sure it isn't stuck in between...

**Roy1961** · 11-11-2020, 03:38 AM

Tried all that, still no AF.

I noticed 2 black prongs for the want of the correct word projecting from the lens, if I push one the aperture blades open, the other won't budge, is that normal?

**FredKingston** · 11-11-2020, 03:50 AM

Originally Posted by Roy1961

Tried all that, still no AF.

I noticed 2 black prongs for the want of the correct word projecting from the lens, if I push one the aperture blades open, the other won't budge, is that normal?

Yes, perfectly normal...

**Roy1961** · 11-11-2020, 04:49 AM

Problem solved, I was going thru a systematic check and noticed the auto/manual switch on the camera was not 100% at AF, push it to manual then back and it worked.

Don't know why my 300mm and 600mm worked while it was like this?

Thanks all for your inputs.

**Marcel** · 11-11-2020, 11:41 AM

Probably because they didn't need the mechanical focus motor from the camera's body to be working. The electronic switch was on but not the mechanical one needed for older AF Nikkor lenses. Your 300 and 600 probably are AF-S lenses that have their own buit-in focusing motor.

Originally Posted by Roy1961

Problem solved, I was going thru a systematic check and noticed the auto/manual switch on the camera was not 100% at AF, push it to manual then back and it worked.

Don't know why my 300mm and 600mm worked while it was like this?

Thanks all for your inputs.