Orion cells a set that rotate to give 50% to 0% transmission. I use them on the moon.
On 9/11/11, jcarman6@q.com <jcarman6@q.com> wrote:
The polariing filter is also a big help. Didn't think of that.
If you plan on using a polarizing filter for throughput reduction, you'll need the type with 2 filters in a common cell, so you can rotate one of them. In this instance, they function as a variable neutral density filter, not a polarizer as far as the camera chip is concerned.
Using a single polarizing filter won't do a thing aimed directly at the sun. They reduce solar glare and improve contrast in snapshots, but the maximum effect is achieved when the filter's bias is at 90-degrees relative to the illumination angle.
Photographers should, as usual, take some practice sunset shots now so you can narrow-down any bracketing on eclipse day.
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