Looking For Some Help With An FSQ and AstroDon Fil

Hi Everyone,

I am looking for some help with an issue that I am having. I am trying to sort out if the issue is me or my setup.

Here is my setup:
Scope - Takahashi FSQ-106n
Filters - AstroDon Gen1 RGB's
Camera - SBig ST-2000

My issue is that I am seeing star size very from my R to G&B. What I would love to see is a set of R/G/B frames from a similar setup. I would be very happy with (1) uncalibrated sub from each channel. Would someone be willing to share?

Brian

Brian Richardson said:
...My issue is that I am seeing star size very (sic) from my R to G&B......

Hi Brian,
Unless you're measuring a G2V star, I would expect variation. For instance, when imaging a red star through a blue filter, the star will be less saturated, dimmer, more point-like than in the red exposure.
In addition, I would think that being undersampled, as you are with the FSQ (2.88"/pixel), doesn't generate good star size data.
One other thought: Do you have the I series filters, the ones made for the interline CCDs like the ST-2000?


dan