What filter? DSLR/photographic? WebObs

Sorry, bit thick and can't seem to find any info. I haven't uploaded any obs lately due to a long run of bad weather/work commitments and I notice the WebObs form seems to have changed. First, what's the difference between Photographic and DSLR? I use a DSLR and last time I uploaded, Photographic was the only option. Second, it tells me I must fill out the Filter box. I shoot unfiltered, my DSLR is unmodded, and the only two options are "Unfiltered with V zeropoint" and "Unfiltered with Red zeropoint". Considering I don't have a clue what a "zeropoint" is anyway, you can understand I'm a little lost here.

Any advice will be gratefully received. Thanks!

Cheers -

Rob Kaufman, KBJ
Bright, Vic, Australia