Flat field usb problem

A place to report problems and bugs in SharpCap
Forum rules
Please read about Troubleshooting USB Issues before posting.

*** Please do not post license keys - please report any problems with licensing to 'admin' by PM ***

Please include the following details in any bug report:

* Version of SharpCap
* Camera and other hardware being user
* Operating system version
* Contents of the SharpCap log after the problem has occurred.
[If SharpCap crashes, please send the bug report when prompted instead of including the log]
BlackWikkett
Posts: 219
Joined: Sat Jun 23, 2018 8:48 pm
Contact:

Re: Flat field usb problem

Post by BlackWikkett » Wed Sep 11, 2019 1:04 pm

Both of the examples you've provided show the white histogram curve at 40%. Try moving the peek to 50%, this is my default and generates working flats with the 294. Settings that work for me are 300 gain, 0 brightness and adjust exposure to move the white histogram peek to 50%. Example for my RC6 using and IDAS D1 filter and a $20.00 tracing pad (illumination source) on lowest setting that is defused through a T-shirt the settings are 360 ms exposure, 300 gain, 0 brightness. Flats tool setup for 50 frames, mono and bias checked.

Fabio F.
Posts: 12
Joined: Sun Sep 08, 2019 11:52 am

Re: Flat field usb problem

Post by Fabio F. » Thu Sep 12, 2019 4:43 pm

I installed the latest version of Sharpcap and tried to capture 3 master flat with the following results.

For all the tests I used a Skywatcher 80ED telescope with a Geoptik flat field.



https://www.dropbox.com/s/crtedzh81qlfp ... 8.png?dl=0

https://www.dropbox.com/s/cs4gex6cb0fkf ... 4.png?dl=0

https://www.dropbox.com/s/6cvl28fjfx5ll ... 9.png?dl=0
Attachments
3 master flat.png
3 master flat.png (855.27 KiB) Viewed 377 times
impostazioni 2.png
impostazioni 2.png (133.97 KiB) Viewed 377 times
impostazioni.png
impostazioni.png (122.22 KiB) Viewed 377 times

Fabio F.
Posts: 12
Joined: Sun Sep 08, 2019 11:52 am

Re: Flat field usb problem

Post by Fabio F. » Thu Sep 12, 2019 4:50 pm

Attachments
impostazioni 2.png
impostazioni 2.png (195.39 KiB) Viewed 377 times
impostazioni 1.png
impostazioni 1.png (188.79 KiB) Viewed 377 times
3 flat.png
3 flat.png (882.86 KiB) Viewed 377 times

Fabio F.
Posts: 12
Joined: Sun Sep 08, 2019 11:52 am

Re: Flat field usb problem

Post by Fabio F. » Thu Sep 12, 2019 4:51 pm

histogram
Attachments
istogramma.png
istogramma.png (144.86 KiB) Viewed 377 times

Fabio F.
Posts: 12
Joined: Sun Sep 08, 2019 11:52 am

Re: Flat field usb problem

Post by Fabio F. » Thu Sep 12, 2019 4:54 pm

Thanks for all the advice.
However, Sharpcap is a fantastic software.

BlackWikkett
Posts: 219
Joined: Sat Jun 23, 2018 8:48 pm
Contact:

Re: Flat field usb problem

Post by BlackWikkett » Fri Sep 13, 2019 2:10 am

Try using Bias in the flat frame tool along with mono.

Fabio F.
Posts: 12
Joined: Sun Sep 08, 2019 11:52 am

Re: Flat field usb problem

Post by Fabio F. » Mon Sep 16, 2019 7:08 am

Attachments
2019-09-16_085746.png
2019-09-16_085746.png (158.62 KiB) Viewed 351 times
2019-09-16_085728.png
2019-09-16_085728.png (156.07 KiB) Viewed 351 times
2019-09-16_085319.png
2019-09-16_085319.png (896.52 KiB) Viewed 351 times

BlackWikkett
Posts: 219
Joined: Sat Jun 23, 2018 8:48 pm
Contact:

Re: Flat field usb problem

Post by BlackWikkett » Mon Sep 16, 2019 6:29 pm

What's the difference between frames 4, 5 and 6. Frame 4 looks OK. I've opened the three images you have attached in Photoshop and they are all usable with image 4 being best. Which software are you opening the images in? Have you tried fits Liberator?

This attached image is your image 4 stretched in Photoshop.
Imageimage 4 by Black Wikkett, on Flickr

I would consider this a usable image.

Fabio F.
Posts: 12
Joined: Sun Sep 08, 2019 11:52 am

Re: Flat field usb problem

Post by Fabio F. » Tue Sep 17, 2019 6:10 am

The images are opened with Astoart 6.

The three images have the same settings.
The first was acquired after restarting Sharpcap 3.2 and the other two immediately after with the same settings

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest