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09-12-2011, 08:01 AM   #1
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PENTAX AF 240FT AF Assist beam / spotbeam

Will the flash and this feature work on K20D? Can the assist beam be used without flashing?

09-12-2011, 08:17 AM   #2
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The TTL part won't work. The flash will always fire at full power. This flash has a switch that manually sets it to 1/4 power, and that's the only power adjustment you have. The flash doesn't have its own light sensor so it's not like the AF280T, which will cut off power if it thinks there was enough. Voltage is safe. The spotbeam will work fine. There's a switch to use just the spotbeam, which will disable the flash. The manual says the spotbeam range is 6 meters. I have the manual if you have more questions. It doesn't mention the K20D.
09-12-2011, 10:03 AM   #3
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No TTL on K20D
I'm thinking to get the AF assist from this flash, so no problem I guess.
09-13-2011, 11:47 AM   #4

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I'm not sure about your part of the world, but if you need just the AF assist, you may want to look for a Metz SCA 374/2AF. When used by itself, it acts as an AF assist, powered by 4 AAA battery cells.

A good used copy is US$ 15 - 20 here.

Note: the AA battery cell in this photo is only for scale.

09-13-2011, 04:51 PM   #5

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your question seems to be present in 2 threads. I had answered here:

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