Atik Cameras Forum

Support (Please note, this is primarily a user forum, for direct Atik support, please email support@atik-cameras.com) => 3- and 4-Series Cameras => Topic started by: Miguel Rivas on January 10, 2012, 04:22:22 pm

Title: The are Problems with the Atik 383L+ ?
Post by: Miguel Rivas on January 10, 2012, 04:22:22 pm

This image is a 15x900 seg.  H-alfa  process with MaximDL v5.18.
It appears like a "rain" background

Title: Re: The are Problems with the Atik 383L+ ?
Post by: Kaidan on January 10, 2012, 05:27:41 pm

It would be better to post a single frame FIT with only histogram strech.

Title: Re: The are Problems with the Atik 383L+ ?
Post by: Miguel Rivas on January 10, 2012, 06:23:03 pm

This is a single frame

Title: Re: The are Problems with the Atik 383L+ ?
Post by: Konihlav on January 10, 2012, 07:18:37 pm

you need to calibrate your raw FITs images prior stacking them (median combining). I'd recommend to calibrate for dark current with master dark frame composed of many single darks. Do use median combine (I do not know why there's unsuitable average settings in MaxIm DL as default). Also, when combining, click checkbox - ignore black pixels (happens from hotpixels in flat fields if FF are also uncalibrated).

Title: Re: The are Problems with the Atik 383L+ ?
Post by: Miguel Rivas on January 10, 2012, 08:50:57 pm

I calibrate the raw Fits with darks, bias and flats before the stacking.....

Title: Re: The are Problems with the Atik 383L+ ?
Post by: timwebster on January 10, 2012, 11:35:33 pm

Miguel,
I have experienced exactly the same effect when imaging horsehead in HAlpha with 383L+ - no idea why it happens.
Tim

Title: Re: The are Problems with the Atik 383L+ ?
Post by: Konihlav on January 11, 2012, 08:08:41 am

Miguel, are you sure? did you test if calibration works on one single frame (Undo/Redo) ? The image you posted seems everything but calibrated. How many calibration frames do you use? (I usually stack 30-50-100 frames for a master calibration frame). Did you turn cooling on :) ?

Title: Re: The are Problems with the Atik 383L+ ?
Post by: Miguel Rivas on January 11, 2012, 09:30:14 am

There are two theories:
a) Problems of calibration
b) Low voltage of  Power Tank
Yes, I turn cooling on ( -20ºC)

Title: Re: The are Problems with the Atik 383L+ ?
Post by: amenophis on February 15, 2012, 06:50:58 am

Hi,

did you solve your problem?

I've got the same and nobody does know about it. I sent Vince a Darkframe, hope he can help me.

Regards,

Thomas

Title: Re: The are Problems with the Atik 383L+ ?
Post by: Lenny on February 29, 2012, 03:33:07 am

I looked at your image in the original post. My question is when did you take the dark frames? If you didn't take them while the camera was at the same setting...that is right before or right after doing the luminance series you'll get this sort of effect. You cant's take reduction frames the next day after turning the camera off.