|
Interesting.
That's disappointing that you have to re-focus for each colour Mike. I have to admit I didn't do that a couple of months back when I took my images of NGC 1566 and NGC 1232. I'm now interested to take a look carefully and see if there is a difference in new shots and in those old ones.
After Gamma's reply last night I did take 2 of each colour, including L instead of clear (no filter). At a quick glance (sort of had to hurry off to get some sleep) the images all looked much the same with respect to focus, but viewing was quite unstable so there were variations even between shots of the same colour.
I'm working at about 2100mm at the moment, so if there is a problem at longer focal lengths I'm sure I'll notice it.
The L in the set is IR blocked so is probably the one you're meaning Bird.
I have to admit I was thinking I'd be able to gain some more exposure detail by retaining the IR sensitivity on the L/clear channel by not using the filter. Not the case it seems.
Thanks all.
|