Background Stripe for ＳＴ-7ＸＭＥ  
　

Luminescence（10min×10, 20cm F6 Newtonian）

Background stripes are shown typically on the right side. 

After Dark Reduction

After Flat Field Reduction

- As shown, the stripes are not reduced completely.
  The residual stripes create much trouble at the following image processing stage.  

A Flat Field Image for ST-7XME

 - Background stripes are shown

Background Stripes for R, G & B Images (20cm F4 Newtonian)

- Hard to take perfect Flat Field and erase the stripes for each R, G & B images.
Ｒed

Ｇreen 

Ｂlue

<For Reference>

A Flat Field Image for SＴ7-Ｅ (ABG)

- ABG grid looks noisy but easy to reduce.
- No need to flat for R, G & B perfect images.