Hi guys,
OK, this is something new, I think... nothing like it has happened to me before.
Please take a look at this:
OK, so that's a normal shot, 1/25s @ F22
Now, same shot, with Hoya HMC ND400:
That's 20s exposure (as you'd expect from an ND400).
See the red band near the bottom and cream band in the middle?
A little subtle? How's this?
That's with a Hoya HMC ND8 stacked on top (effectively making it an ND3200 filter), shot at 20s, F8.
Now, I've shot plenty of long exposure shots with this camera and filters and I've never seen anything like this; I've shot even longer, 5-6 minute shots in the past.
It looks like it's flaring (especially the last shot), but the sun is almost directly behind me in this shot, and I had my hood on at all times.
Also, I can't replicate it everywhere. I just tried shooting a few 30s shots inside the house, and I'm not getting these. I didn't have any other lens with me this morning when I was taking these, so I can't rule out the fault being in the lens, although mechanically speaking, I don't know how that can be; there's absolutely nothing wrong with the first picture.
I don't see anything wrong with the ND400 filter, either.
My one year anniversary is coming up (I bought the K-7 on launch day) so if it's something to do with the body, I'll need to send it in for repair soon.
Thanks.