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A2e autofocus obstruction


j_viray

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The 70-200L blocks the AF beam. My 28-105 doesn't block it. I've heard that the A2e can't use external flash AF assist beams because of its AF horizontal sensitivity pattern. Before you go, "Now now silly boy, if you read the Helsinki archives then you would see that the camera disables ALL external AF assist beams" I would like to know if there is some hokey solution. I can't really experiment here but here goes...

430EZ with CF7 disabling AF

540EZ with CF7 disabling AF

any of the above with center focus point used and CF7

I saw one thread where someone got it to work but he failed to explain how. Even though 2.8 is lightning quick, on low contrast it stinks pretty badly. I have even tried laser pointers and Maglite IR flashlite solutions. They are OK, but I look pretty stupid shining laser pointers at people. AND NO I DON'T TRY AF ON BLANK WALLS.

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  • 3 months later...

At the risk of sounding like I'm under estimating your problem, are

you saying that when you use the 70-200L lens, that the flash in some

way finds this as an obstruction. I can appreciate that an internal

flash would, but not a 430EZ or a 540EZ. Could you expand or

simplify your problem.....Regards

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The problem is not that it is blocking the flash, but that it is

blocking the AF assist beam. Because A2e was the first(?) EOS with

five point focusing and the 430EZ did not support multi-point

focusing, the AF assist on the camera was designed to override that

of the flash. As far as I know there is no remedy to this problem.

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Jim (and others), I have searched EOS5/2A/E User Guides (both Hove

and Magic Lantern) and cannot find any info regarding the above "over-

ride" - Have I got it right? <The AF assist (aux light emitter) on

the A2 camera, was designed to over-ride any AF assist (aux light

emitter) from the flash, namely, 430/530EZ>

My suggestion to J Viray was going to be - Add a hot-shoe adaptor to

lift the flash emitter a few centimeters and solve the problem

physically. However, this would be useless if the flash emitter is

disabled.

QUESTIONS>>>...... Is this permanent over-ride on the EOS 5 as

well?......Does this over-ride condition remain, when Eye Control AF

is "off"?......Does this over-ride condition remain when Eye contol

is "off" and focus is utilising (locked) centre position. ----

Regards.

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Eureka! I taped a miniature periscope to the emitter and then angled the mirror slightly down. It works fine, cant say the wide a-rea lines cover the points ALL the time, but when it counts, it does. I've ordered fiber optic cable to see what that would do.

 

<p>

 

Thanks for all your responses!

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