Canon 70-200 f4 IS - focus problem?

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#1312981 27-May-2015 17:58

That is plenty light. What was the focus distance. You don't need manual focus at macro distance, just when it is within 5-10cm of its MFD. How far away was the flower? Did you try anything else other than the flower.

Batman

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#1312983 27-May-2015 18:02

Esawers you need to understand that the mfd for this lens is a lot further than the mfd of your kit lens. This is NOT a macro lens.

esawers

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#1312985 27-May-2015 18:02

ISO 1250
1/125
f4.5

ISO100
1/200
f4.5

Both manual focus
Occasionally it auto focuses which makes me think its the light

esawers

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#1312986 27-May-2015 18:04

joker97: Esawers you need to understand that the mfd for this lens is a lot further than the mfd of your kit lens. This is NOT a macro lens.

The window on the lens says 1.2m minimum, so I've been standing at least 1.5m back
The cat photo was about 3m back

Does the MFD change when you zoom in?
Standing about 2.5m away from the kids, I couldn't focus at 200mm

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#1312987 27-May-2015 18:06

There is plenty of light available reading from your exposure settings. Take it to a shop and compare.

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#1312988 27-May-2015 18:07

Mfd does not change with focal length. It is fixed. There is something wrong. If you got sold knowingly with something wrong ... Then... Scumbag they are!

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#1312989 27-May-2015 18:11

Just thinking out loud, how does the CGA work in these situations

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#1312993 27-May-2015 18:20

esawers: It's definetly on 1 shot
works better in good lighting, hardly works at all in muted light, its a bit intermittent
I don't mind sending it to Canon (I got it super cheap from a retired photographer) but wondered if I was expecting too much

Just reading this ... By the way everyone i know that had a Facebook account nowadays Call themselves a photographer

rendezvous

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#1312996 27-May-2015 18:22

Ensure the auto focus isn't on the limited 3m setting on the side of the lens. That changes the minimum distance it will auto focus to, to help give quick focus at normal distances.

esawers

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#1312997 27-May-2015 18:28

rendezvous: Ensure the auto focus isn't on the limited 3m setting on the side of the lens. That changes the minimum distance it will auto focus to, to help give quick focus at normal distances.

Thanks! It is on 3m - infinity
The other option is 1.2m to infinity - is that the one to use??

Edit: Obviously it is! Makes more sense. I'll give it a go

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#1313006 27-May-2015 18:29

Lol

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rendezvous

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#1313008 27-May-2015 18:29

Yes, 1.2-infinity lets auto focus use the whole range.

Fred99

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#1313010 27-May-2015 18:32

Erratic autofocus can be a symptom of poor electrical contact between lens and body, so make sure the electronic contacts are clean. Some people suggest using an eraser to wipe across the contacts. Be careful doing this - not to drop debris into the camera body or lens. "Deoxit" is a contact cleaning system often recommended for cleaning those contacts. Jaycar stock it - not cheap though. I initially thought it was probably snake oil, but since buying some and using it - IMO it is extremely good.
Unfortunately the issue you describe can also be a symptom of USM failure - which is expensive to fix.

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#1313011 27-May-2015 18:34

Feeling much better about the purchase now lol. Looking forward to getting out into the daylight again tomorrow and having a play.

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#1313027 27-May-2015 19:26

I assumed you hadn't turned on the focus restrictor... silly me.

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