When using a circular polarizer, do you have to adjust the exposure control or does the Canon ELAN II do that automatically? Does the Canon ELAN II have a TTL metering system that allows for the compensation of the filter to be automatic?

Thanks!

-- Joey Diletto (joey_diletto@email.com), April 23, 2002

Answers

All EOS cameras meter through the lens. There is no need for any exposure compensation on your part when using any filter that's put over the lens.

-- NK Guy (tela@tela.bc.ca), April 23, 2002.

Well, the title of your questions suggestions something else i.e. something about Polarizers from Canon and not concerning compensation to be done with a polarizer. It would be good if you give a proper title something like Exposure Compensation for Polarizer.

-- sajeev (chack74@yahoo.co.in), April 24, 2002.

There are several concerns about using a polarizer on an EOS camera like the Elan II / EOS 50.

• Metering of the ambient light and focussing is TTL. Since this uses internal mirrors,a CIRCULAR-polarizer (CPOL) is suggested instead of the LINEAR polarizer (POL) filter, even though it may be the same shape and diameter.
• If you use an older EZ series Speedlite flash, the A-TTL sensor for the preflash is on the flash body, and is NOT TTL. However, the actual flash exposure IS controlled by TTL. This means that the pre-flash metering and the distance scale might be misleading. Assuming a filter factor of 2, the flash coupling range is approximately one half of the one indicated on the flash.

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-- Julian Loke (elan7e-owner@yahoogroups.com), April 24, 2002.