OK, what's an "emf" chip and who has them?
Chuck Norcutt
On 3/10/2011 7:39 PM, James King wrote:
> The emf chip is quite clever, Its main party trick is to provide the
> body with the focal length and wide open app of the lens.
> Once programmed it retains its data AND it also allows the thumb wheel
> on the canon camera to control aperture just like a real canon lens. (of
> course there is no linkage so it does not actually effect the lens but
> it means that I can meter wide in open manual set the thumb wheel to the
> app I am going to shoot at and set the shutter speed. I then manually
> stop the lens down to that app by rotating the app ring and the exposure
> is spot on and the actual app is recorded in the exif too! Effectively
> the emf chip is a very good emulation of a canon af lens
> in manual mode. The only problem I did find is that if I use mirror
> lock-up on the 5D mark 2 I get a communication error. Mirror lock-up on
> the 5d mark 1 works fine.
> Regards
> James
>
>
>
> On 10/03/2011 22:26, usher99@xxxxxxx wrote:
>> JK writes:
>>
>> I have several adapters with emf focus confirmation chips on them.
>> These chips allow the user to program the focal length of the lens and
>> the wide open aperture.
>>
>>
>> I have used a different chip that uses the DOF preview button (not the
>> shutter and I like that) to activate it. One requires a wide aperture
>> programmed in first to use the AF confirm with any precision--
>> seems to quite good on the CV180/4 though the VF is OK with that lens.
>> (depth of focus on the standard screen seem to be about F4 anyway)
>> It is a pain to reprogram it for the correct aperture. I think it may
>> be easier with the emf chip? Do you find that to be the case?
>> Mike
>>
>>
>>
>
>
>
> Companies Act 2006 : http://www.londonmet.ac.uk/companyinfo
>
>
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