I think I got it from big_is - although currently he/she has no items on
ebay. My algorithm was simple go for the lowest price where the feedback
was 98%+. My adapter looks identical to the ebay item 330196736479. My
guess is there's one comany in China churning them out and then someone
else gluing on the chips...
Chuck Norcutt wrote:
> Sounds good to me. From which seller did you buy this adapter?
>
> The center focusing point on a 5D is a "cross-type" point. Unlike the
> other 8 focusing points the center point is sensitive to both vertical
> and horizontal lines although twice as sensitive to vertical lines. The
> other points are sensitive to either horizontal or vertical but not
> both. The center point is the only one guaranteed to work down to f/5.6
> brightness and nothing is guaranteed at smaller apertures. Canon
> guarantees that the autofocus is accurate to 1/3 the "depth of focus"
> which is a term that was used here recently in another context. For an
> explanatory paper on the subject see:
> <http://doug.kerr.home.att.net/pumpkin/AF_accuracy.pdf>
>
> Yes, DP Review says the 5D sensitivity at ISO 100 is really 125 and
> that's something I try to keep in mind when using my Sekonic L358. My
> Minolta A1 is also more sensitive than the ISO setting indicates and
> that needs a 2/3 stop correction.
>
> Chuck Norcutt
>
> jking@xxxxxxxxxxxxxx wrote:
>
>>I have a focus confirmation adapter purchased form a Hong Kong seller on
>>ebay.
>>
>>
>>I also have a Canon right angle finder and if I focus using it and then
>>press the shutter halfway the focus confirmation inevitably agrees and
>>visa versa. I found the centre square to be moer sensitive then the other
>>squares around it and have actually set the focus mode to the centre
>>square only. I focus wide open and then stop down. If you stop down and
>>then focus simple tests seem to indicate that it works up f5.6 and
>>sometimes when stopped down to f8 so I doubt if it would work for a 500/8
>>mirror or slower.
>>
>>Focus confirmation works fine with all the lenses I have tried:
>>tamron 80-200/2.8
>>tamron 90mm (hot spotting in centre at f22 and 32 - NOT the fault of the
>>adapter)
>>olympus 50/1.8
>>35/2
>>28/2
>>24/2
>>21/3.5
>>
>>not tried it with bellows or shift lenses.
>>
>>As far as metering modes go again I meter wide open in manual adjust to
>>the recommended shutter speed then decide what app I want to shoot at and
>>clculate the corresponding shutter speed and adjust the camera's shutter
>>speed to match. I don't meter stopped down or use app or shutter speed
>>priority.
>>
>>Its slow and clumbersome for street photography but for landscapes and
>>static subjects I find it no slower than using my Bronica. I also have a
>>sekonic L558 and I have found that the Cannon 5d seems about 2.3rds of a
>>stop more sensitive than the Bronica with fuji slide film. I am guessing
>>that the fuji film is about 1.3 of a stop less sensitive than it should be
>>and I have read reports of the canon being 1.3 of a stop more
>>sensitive....
>>
>>Overall I am happy with the focus confirmation adapter and feel no desire
>>to replace my tamron 90/2.5 or 80-200/2.8 with a modern autofocus version.
>>I don't feel any of the olympus wides are as sharp as these telephotos.
>>But I never felt any of the bronica wides where as sharp as the 75mm
>>standard lens either. I guess that if you want razor sharp wides its a
>>Mamiya 7 and a lots of money... :-(
>>
>>James
>>
>>
>>
>>
>>
>>
>>
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>>
>>
>
>
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