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Standard zoom and mid range Lenses with focal lengths larger than 12mm, but no longer than 60mm, includes standard zooms and portrait primes plus some macro lenses.

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Old 4th July 2015
Ricoh Ricoh is offline
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12-40 on Oly cf Pannasonic

Recently picked up a copy of the 12-40, and soon afterwards headed out to Hebden Bridge (and Haworth) to take some test shots.
In haste I coupled the lens to my GX7 and was initially unhappy with the performance (some examples in my Flickr account if remotely interested). Switching to the EM5 I can see quite an improvement - just some garden shots not worthy of display in any shape or form - so wonder whether the 12-40 works better with Olympus cameras, eg on the EM5. Any thoughts?

Two further points:
i) the 12-40 is described as weather proof (slash is probably a better description). Has anyone used the 12-40 with the EM5 Mk I in rain, and did it survive?
ii) Can the L Fn1 button be used with the EM5 mkI ?
Thanks.
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Old 5th July 2015
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Re: 12-40 on Oly cf Pannasonic

What about its performance didn't you like Steve? AF speed? AF accuracy? Sharpness? CA? ...

I'd be surprised if it didn't perform well on a GX7.
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Old 5th July 2015
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Re: 12-40 on Oly cf Pannasonic

Thanks for taking the time to reply Paul.

I didn't make myself very clear, did I!
The issue is one of AF accuracy. On the GX7 I was using '1-Area' focus point, the only other option is to use pin-point, but I can't see how to prevent an enlarged image from appearing when AF is engaged by half press, or by back button focus using AF/AE Lock. Having an enlarged image doesn't help with composition when you're in a hurry to get the shot.
By comparison, using the 12-40 on the EM5, with the smallest focus target available (s), it nails focus every time.

I believe the first image is acceptable from an AF point of view - what do you think? (12-40 on the GX7)

Canal-side by Steve Wales, on Flickr

But here in the second image AF has missed acquisition, and it really should have done, the target is big enough: (again 12-40 on the GX7)

Feeding birds by Steve Wales, on Flickr
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Old 6th July 2015
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Re: 12-40 on Oly cf Pannasonic

Quote:
Originally Posted by Ricoh View Post
Recently picked up a copy of the 12-40...
ii) Can the L Fn1 button be used with the EM5 mkI ?
Yes, I've set mine to bring up the ISO settings.
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Re: 12-40 on Oly cf Pannasonic

Steve - maybe some controlled testing might help - an easily repeatable test, varying one thing at a time. For example:

- Choose two easy targets - one at infinity (ish) and another closer by
- Try to keep the lighting consistent
- Alternate focus near and far and take lots of shots
- Count hits vs misses as a %
- Change the camera body and try again
- Change the lenses and try again
- See if you spot a statistical difference as the body or lens changes
- If you can't see a difference, start picking increasingly harder targets (smaller, lower contrast between subject and background, darker conditions etc).

I would hope this would yield something, but it'll be a time-consuming exercise!
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Re: 12-40 on Oly cf Pannasonic

Thanks for that Paul.
A controlled test would be the way to go, no doubt about that.
Switching to the EM5 the hit rate shot up, so I might have a solution for general walkabout photography, i.e. when I have the wife in tow (or is that the other way around ): EM5 with the 12-40, and GX7 coupled with the P7-14, after all the 7-14 was the main reason for buying the GX7 in the first place, it handles the purple blobs better.
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