Since I posted some sun images, I would like to offer some caution tips for shooting at the sun.
Don't try this at home kids
I used a Panasonic Super Zoom FZ80 (NOT one of my expensive cameras).
It has an electronic eyepiece not an optical one.
I set it in Manual to a high F stop and electronic shutter speed and lowest ISO setting.
(f/8, 1/13000sec, and ISO 80)
Before pointing at the sun with the filter in place I zoomed in some to keep the image from being a small hot dot. With the camera on a tripod I swung it around towards the sun, found it and zoomed in more.
Maximum zoom with this camera is 35mm equivalent 1200mm.
The image was initially blurry and quickly autofocused on the sun. Snapped a couple images and swung away from the sun to view results. Over the course of the eclipse I went back out and did the same thing.
Image was still too bright. The built in IR cut filter over the sensor plus the 780nm add on seems to have prevented any sensor damage. Limiting time pointed at the sun kept the camera internals from getting overly hot.
But, I suggest buying a real solar filter.
My next attempt at the sun, sun spots, planet crossing will use the IR filter AND a lens mounted UV-IR cut filter.
(most ND filters don't really filter out IR, or so they say)
Some graphics to show what I plan.
A UV-IR cut filter and a 720nm IR filter.
This should allow light from about 690nm to 720nm through to the sensor.
