----- Original Message ----- From: "David Zaninovic" <[EMAIL PROTECTED]>
I would like to have P-TTL because of the wireless high speed flash option on my D. I will try to find some tubes that will transfer electrical contacts.
It is much easier to shoot bugs handheld with flash set to 1/4000 speed and have a few tries to get the focus right.
P-TTL creates a long flash burst that allows a short shutter speed. With ordinary TTL flash, the shutter opens, and the needed flash light is applied. I'm not sure whether P-TTL gives an edge here, but I suspect that it's easier to make flashes that way. For practical purposes it doesn't matter whether you freeze the action with a 1/4000s shutter speed, or a 1/4000s flash duration, as long as ambient light is more than 4 stops dimmer than the flash burst.
If bugs are your target, I think the 50mm/90mm combo will probably suffice. With 1.8x a 10mm bug becomes 18mm across the CCD. That'll give you plenty of detail.
Whichever solution you end up with, I hope you find one that makes you happy with the pics you get. Would be fun if you posted some on the web for us see, too. :-)
Cheers,
Jostein
