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On 11/03/2011 19:14, Chuck Norcutt wrote:
> 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
>>
>>
Companies Act 2006 : http://www.londonmet.ac.uk/companyinfo
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