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M42->MAF Adapter With Focus Confirmation

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Peekayoh View Drop Down
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2009 at 21:36
I realise that the in camera AS adjusts according to focal length, but how much leeway is there? For instance will a setting of say
28/f2 cope with 24/f2.8 and 35/f1.8
or a setting of
60/f1.2 cope with 50/f1.4 and 85/f2?
 



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Gabriel View Drop Down
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Post Options Post Options   Quote Gabriel Quote  Post ReplyReply Direct Link To This Post Posted: 20 January 2009 at 22:44
Here is the list of focal lengths that you can manually enter within a k20d:

8-10-12-15-18-20-24-28-30-35-40-45-50-55-65-70-75-85-
100-120-135-150-180-200-250-300-350-400-450-500-550-600-700-800

As you can see, the margin is getting narrower at the wide end, so I'm not sure about using a setting of 28 for a 35mm lens. That being said, it is probably better to use a setting of 28 for a 35mm than using the default setting of 50mm.
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Peekayoh View Drop Down
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2009 at 10:18
My own feeling (gut not technical) was that the wider end may give more latitude seeing that the AS has to work harder at loger focal lengths.
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Gabriel View Drop Down
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Post Options Post Options   Quote Gabriel Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2009 at 12:09
Originally posted by Peekayoh Peekayoh wrote:

My own feeling (gut not technical) was that the wider end may give more latitude seeing that the AS has to work harder at loger focal lengths.

Wich also imply that if your setting is not close enough to the real focal length, you'd better use a setting under the real focal length than over the real focal length.
(ie it would be better to use a 24mm setting for a 35mm lens than using a 35mm setting for a 24mm lens).

Stabilisation would be less effective than using the real focal length, but at least it will not overcompensate.
Extreme example: I can tell you than on a KM5d, using a setting of 500mm on a 135mm lens produces 90% of blurry pictures. Better not use stabilisation than using it with such an error within the settings.
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Peekayoh View Drop Down
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2009 at 14:53
Sounds logical. Pity there's no tech data; none that I could find anyway.
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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2009 at 18:55
I use a chipped 16mm adapter quite happily with lenses up to 200mm - probably not as efficient as the correct FL for AS/SSS, but certainly no ill effects and focus confirm works fine.
 



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Gabriel View Drop Down
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Post Options Post Options   Quote Gabriel Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2009 at 22:39
My guess is that a 16mm setting for 200mm is probably not doing much (except focus confirm), but it's nice to have a confirmation that there is no ill effects.
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Peekayoh View Drop Down
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 23 January 2009 at 21:44
Thanks for the help guys. I'll just have to "suck it and see".
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lionoche View Drop Down
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Post Options Post Options   Quote lionoche Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2009 at 11:20
Hi,

I am about ordering the 4-lens version of the M42 to M-AF adapter.
For those who ordered from Europe or US, how long did you wait for delivery ?

Thanks for your help
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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2009 at 11:26
Usually about a week to Belgium (cheapest option). I only ordered the "one lens" version, so don't know if the four lens takes longer.
Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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Peekayoh View Drop Down
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2009 at 11:27
I ordered 22nd Jan. I've had dispatch confirmation but still waiting.
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lionoche View Drop Down
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Post Options Post Options   Quote lionoche Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2009 at 11:40
Thanks gents !
Peekayoh, what version did you order ?
One requiring special programming of the chip ?
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Peekayoh View Drop Down
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Post Options Post Options   Quote Peekayoh Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2009 at 11:46
Yes. The four focal length option.
BTW I got tracking number on 9th Feb. Unfortunately I don't read Mandarin.
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krca View Drop Down
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Post Options Post Options   Quote krca Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2009 at 12:54
I've got the adapter in five days (air-mail). It was very fast, I think.
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