[ZeroID (Brent)]

Like many of you guys I suffer from LP problems, sodium street light glow mainly. I have used an Astronomik CLS filter quite effectively but it's only a 1.25 ", it extends the exposure time considerably and you have to seriously counter the blue effect in processing.
I was up at our local Photo retailer and he had a bin of filters on sale, 5 for $10, digital does not need them so out they go.

Grabbed $10 worth and was playing around with the SONY daylight just for fun. Noted clouds and sky got better seperation with various filters so I wondered how they would do astronomically. Did a couple of 10 second tests widefeild with the camera and with one particular filter got a distinct improvement with the pesky background red glow being almost eliminated. More testing required.

Finally got some clear sky and the Ob working again so did some tests.
I pushed the ISO and time to see what difference it made. These are single frames, unprocessed other than being reduced to meet size restrictions.
Exposure is 30 secs at ISO 3200 for both frames taken within a minute or so of each other. First frame without the 80A, second with it obviously.

The filter was a standard Wratten C80A, light blue. $2.00
I'm going to do more testing but one area it may also help is in guiding. I think I'm having guiding issues because of lack of contrast between the target and the background. First tests with AmCap and an SPC900 seem to support this.