Flat patterns of typical filters

Why are they useful?

- When you notice some strange pattern on the sky background of images, please refer to these flat pattern images. If the pattern that you find on the images is strongly deviated from the expected flat pattern, the strange deviated pattern may be a symptom of problems.

No flat pattern here that you need?

- Please refer to a flat pattern for a filter which has a wavelength range close to that of the filter you are using. Their flat patterns would be similar to each other (but not same).

B Johnson (W-J-B) : DomeFlat (9/2005)

V Johnson (W-J-V) : DomeFlat (9/2005)

Rc Cousins (W-C-RC) : DomeFlat (9/2005)

Ic Cousins (W-C-IC) : DomeFlat (9/2005)

g' SDSS (W-S-G+) : DomeFlat (5/2006)

i' SDSS (W-S-I+) : SkyFlat (9/2005)

z' SDSS (W-S-Z+) : DomeFlat (9/2005)

NB921 (N-B-L921) : DomeFlat (9/2005)

NB912 (N-B-L912) : DomeFlat (9/2005)

NB816 (N-B-L816) : DomeFlat (9/2005)

V+R (W-J-VR) : DomeFlat (9/2005)

If you are still unsure, it would be better to download flat frames for the filter by using STARS and carefully check out the flat pattern.