Author Topic: QHY5L-II (color) test drive  (Read 9755 times)

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
QHY5L-II (color) test drive
« on: September 30, 2012, 05:33:38 AM »
The camera is really small)
It is arrived just three days ago but the local weather was quite bad till a previous night. The camera has significally smaller noise level than my QHY5V and very interesting for solar imaging lower limit of exposure time at 1/50000 sec.
The first lunar image is combined from two stacks of 150 frames made "in drift" with simple photo tripod and MTO-500 (500 mm, f/8, Mak-Cas telephoto lens) through a hazy air.

A small pixel size also good for planetary imaging without the Barlow lens or eyepiece projection. So here the Giant planet with the same equipment and 1.4x scale. =)
« Last Edit: September 30, 2012, 05:39:54 AM by Artyom »



Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #1 on: September 30, 2012, 05:59:12 AM »
Last night the camera rode on a bigger telescope - 9,25'' Мак-Cas. But seeing was very unstable and after a midnight came a dew and a fog. So here several views of lunar surface. Stacked with AviStack2, 350 frames from 1000.

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #2 on: September 30, 2012, 06:37:53 AM »
Last night also was an Uranus opposition night. So I shot it just for note this event) With 2x Barlow lens, exposures around 120 ms and gain boost. No details but color)

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #3 on: September 30, 2012, 06:47:18 AM »
Also Jupiter in prime focus in poor seeing. When the planet climbed high came a strong dew :(

Stacked around 1000 of 3000 frames. First - in color (with IR-cut filter), second - in IR (Baader IR-pass 685 nm), third - simple IR-RGB composition of first and second.
And a version with 2x Barlow lens (2000 frames)
« Last Edit: September 30, 2012, 02:28:37 PM by Artyom »

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #4 on: September 30, 2012, 08:55:23 AM »
There some uncertainty for me with correct debayering method.
Dr. Qui, is it depend from selected resolution? Did you have some suggestion about correct scheme?
In general, I can figure it out from expirience but if already known - it will be useful now)

Also, I found a problem with color at 20 microsecond exposures (gain was around 6%). Today I tried to shoot the Sun with 100-mm f/10 achromatic refractor that was covered by AstroSolar Photo solar filter. It is quite "bright" but 20 us exposures can show the Sun unsaturated. But image has two regions with different CFA pattern (first image). May be readout desync or so... And at some point after aligning in Registax I get clearly visible division of this two regions (second image, another 20 us series). Is it software or hardware issue? At longer exposure time (ex, 200 us) there is no such problem.
« Last Edit: September 30, 2012, 08:58:54 AM by Artyom »

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #5 on: September 30, 2012, 09:16:51 AM »
And some solar images.
First - 100 mm achromat, focal reducer, ND-filter, IR-block. Grayscaled, stacked ~ 300 frames (20 us).
Second - 100 mm achromat, prime focus, IR-block. Grayscaled, stacked ~ 700 frames (20 us).
Third - 100 mm achromat, 2x barlow, IR-block. Stacked ~ 350 frames (160 us).

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #6 on: September 30, 2012, 09:50:53 AM »
In brief, QHY5L-II is a very interesting camera that combines high speed readout, several resolution set, wide exposures range and low noise. Rolling shutter is not a big issue at mid and small resolution. 8 bit output also not a big lack due to small noise level that not masking significally a signal. BTW, there kind of HDR-mode, but I don't know how it works yet.

Small body size make possible to maintain parfocal range with an eyepiece and to adjust image scale in projectional configurations (with barlows and eyepieces). I like it) The camera will be a perfect if it will get in series production with a standard M28 filter thread in its front (or some kind of adapter).

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #7 on: September 30, 2012, 01:18:41 PM »
And tonight update - Jupiter couple of hours ago with QHY5L-II (IR-cut) and 100-mm f/10 achromatic refractor TAL-100R. Prime focus and 3x PAG Barlow lens, stacked 600 and 2000 frames correspondently. Quite good resolution indeed.

QiuHY

  • Administrator
  • Hero Member
  • *****
  • Posts: 3581
    • Facebook
    • Twitter
    • View Profile
    • Email
Re: QHY5L-II (color) test drive
« Reply #8 on: October 01, 2012, 08:33:45 AM »
Hello,

      Thank you very much for the first light test of QHY5L-COLOR.    I have two questions of it:

1.Can you report the max FPS of the camera in difference resolutions in high speed mode. And tell us your computer setup(CPU, main board) .We need to make a static of this information.

2. The QHY5L-II use a IR filter with 680nm center wavelength( 50% cut off position is at 680nm) .  Maybe 650nm is better?


Best regards,

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #9 on: October 01, 2012, 10:49:13 AM »
1. All of images posted above captured with the netbook 3Q RS1001T (Atom N450 HT 1.66GHz, Intel N10 chipset). At fast readout, High priority disk write, RAW AVI, 1 ms exp, 20% gain it give:

ResPreviewDiskWrite
320x240201-203 fps188-198 fps
640x480105-107 fps95-102 fps
800x60068-70 fps64-70 fps
1024x76843-44 fps39-42 fps
1280x96029-30 fps24-27 fps

And on my desktop (Pentium 4 HT 3.0GHz, MB ASUS P4P800 SE (i865 chipset)), At fast readout, High priority disk write, RAW AVI, 1 ms exp, 20% gain

ResPreviewDiskWrite
320x240198-203 fps187-194 fps
640x48095-106 fps94-102 fps
800x60069-73 fps57-65 fps
1024x76843-44 fps37-43 fps
1280x96029-30 fps22-28 fps

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #10 on: October 01, 2012, 11:02:50 AM »
2. The QHY5L-II use a IR filter with 680nm center wavelength( 50% cut off position is at 680nm) .  Maybe 650nm is better?
My sample of the camera has not any internal IR-filter. The first image made without any external filters, second - with Baader IR-pass 685 nm and third - with GSO IR-blocking filter.
But if you plan to put a IR-block into the camera, I believe what 680 nm will be better because it will let use IR-pass filter like Baader 685 nm.  Or make an IR-blocking filter with 650 nm but detachable.
« Last Edit: October 01, 2012, 04:53:25 PM by Artyom »

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #11 on: October 13, 2012, 03:52:20 AM »
One more try with the camera. 9.25" MCT, prime focus, QHY5L-II color. Visual image with GSO IR-blocking filter (stacked 1000 of 3000 frames), IR with Baader IR-pass 685 nm (600/3000), and IRRGB composition.
« Last Edit: October 13, 2012, 02:14:31 PM by Artyom »

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #12 on: October 13, 2012, 05:12:40 PM »
IRRGB from Color + IR images captured with 3x barlow, 0.7x scale.

QiuHY

  • Administrator
  • Hero Member
  • *****
  • Posts: 3581
    • Facebook
    • Twitter
    • View Profile
    • Email
Re: QHY5L-II (color) test drive
« Reply #13 on: October 15, 2012, 01:43:44 AM »
Hello,

            Can you test a lower gain and longer exposure. For example:  Gain=10% and exp=40ms.

Best regards,

Artyom

  • Sr. Member
  • ****
  • Posts: 276
    • ICQ Messenger - 286930851
    • Yahoo Instant Messenger - sigma72ac@yahoo.com
    • Twitter
    • Youtube
    • View Profile
    • AstroDrome
    • Email
Re: QHY5L-II (color) test drive
« Reply #14 on: October 15, 2012, 02:53:30 AM »
Can you test a lower gain and longer exposure. For example:  Gain=10% and exp=40ms.
Ok, I'll try this if seeing will allow such exposure.