Comments made by greyhoundman - Page 2

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If you want to run the previous circuit from an auto. Like when out in the field.
You can use this circuit to regulate the supply from the vehicle.
[IMG]http://i630.photobucket.com/albums/uu25/wildlifephotog/regulator-circuit.jpg[/IMG]

Comment by greyhoundman posted on Lightning images at 10/11/2009 - 15:05

Never tried it. But I don't think the Wein is sensitive enough for lightning. I've tried using other optical triggers for cameras. But they are not sensitive enough.
The circuit I posted has picked up a flash fired in another room down the hall in my house.

Comment by greyhoundman posted on Lightning images at 10/11/2009 - 14:58

They must work. Otherwise they would not get $329.00 for one.
The speed of the detecting circuit is quite fast, like in low milliseconds.

Comment by greyhoundman posted on Lightning images at 10/11/2009 - 14:27

It's not that expensive to DIY one. It will all fit in a small experimenters boxx. And can even attach to the hotshoe too. The only thing outside the box is power and the LDR.
[IMG]http://i630.photobucket.com/albums/uu25/wildlifephotog/Lightning-circuit.jpg[/IMG]

Comment by greyhoundman posted on Lightning images at 09/11/2009 - 22:54

It is easy to build a lightning trigger that sees through the VF.
That way it only triggers when the lens sees lightning.

Comment by greyhoundman posted on Lightning images at 09/11/2009 - 21:11

Hmmmmm. That is a poke in the eye with a sharp stick.
I'll never understand the marketing practices.

Comment by greyhoundman posted on Advice For Flash Gun Please ! at 09/11/2009 - 14:13

There are also the Vivitar DF-283 and DF-383. They do PTTL as per Vivitar rep.

Comment by greyhoundman posted on Advice For Flash Gun Please ! at 09/11/2009 - 13:32

Just another little tip. I noticed you used aperture priority in the photos you posted. Go strictly manual. The camera just gets a headache if you let it try to think.

Comment by greyhoundman posted on Red ring around moon at 04/11/2009 - 12:26

Not bad. The colors of the seas are accurate.
Full moon and close to it, is the hardest time to get a really good photo. Once it starts to shrink, shoot for the terminator areas. The added contrast really makes features pop out.

Comment by greyhoundman posted on Red ring around moon at 03/11/2009 - 20:35

Sorry we took a left turn here.

At iso 800 and f4, the exposure should have been 1/8000. At f16 and iso 800, it should have been 1/500.

So I would actually start at iso 400 and f16. With a shutter speed of 1/250. And you may still have to adjust the speed a hair after a couple trial shots.

OOPS. These figures are for full moon or close to it.

Comment by greyhoundman posted on Red ring around moon at 03/11/2009 - 16:10

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