katzeye

[arhi_tectu1]

hi everybody
i was wondering if some one can give me some advice.
i recently received a 2X canon extender that i want to use on my
canon 70-200mm f 4.
with the extender mounted on the lens goes to f 8 (so no AF and no focus confirmation).
i was wondering if a katzeye focusing screen will be helpful (at f 8 )
here in romania it cost 100 eur so i don't want to spent money if its no good at f8 (i also know that they have a optibright version of the screen but the one that i found is without optibright) .

Thanks in advance

Best regards
Catalin

[Orio]

No, at f/8 it is not helpful for me.

[martinsmith99]

I've heard that taping some of the pins allows the AF to function. Sounds risky though so I take no blame if it goes wrong.

[arhi_tectu1]

thanks for the reply Orio

@martinsmith99 I have tried this with some tape but is not working

the odd thing is that i have recently buy'd a CZJ 135 triotar f4 and the af confirmation is working even if it reaches f8 with the extender

thanks everybody

[martinsmith99]

[arhi_tectu1]

@martinsmith99
that is what i was trying to say that with the 2x and the 70-200 i don't get the af confirmation as i do with the triotar