AF540 versus the competition; question about AF assist

435 posts
15 years
Roodepoort,
South Africa

Posted 02/12/2011 - 07:11 Link

I posted this on pentaxforums as well a couple of days ago; different people might have different flashes so might be able to shine their light on the second question in the quote.

And somebody might have an idea about the first question.

Quote:

According to the AF540 manual (and confirmed in real life), the AF assist of the flash does not work while the flash is in auto mode. It does work when the flash is in p-TTL, full manual (and obviously SB) modes.

The first question is if anybody here knows why this limitation exists?

And the second question is if similar models of the competition (Metz, Sigma, ...) have the same limitation?

Pentax K10D + Vivitar 55/2.8 macro + Super Takumar 55/1.8 + SuperMultiCoated Takumar 85/1.8 + SuperMultiCoated Takumar 135/3.5 + SuperMultiCoated Takumar 200/4 + Super Takumar 300/4
Pentax K100D + DA18-55ALII + DA55-300
Pentax K5 + FA31Ltd + M50/1.7 + DFA100WR + M120/2.8 (+ DA18-55WR at occasion)