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INDI Library v1.9.4 Released (17 Jan 2022)

Bimonthly Stable INDI Library release introduces new drivers and fixes for existing ones. Some highlights:

Mono imaging - cycling of L-R-G-B for imaging

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Hello,
I've been using DSLR/OSC but recently acquired a complete mono setup (ASI294MM and EFW 8-position with LRGBHOS set of filters).
Completely new to mono.

I am wondering if it is possible with Ekos:

-- instead of shooting, say, 30 frames of L and then 10 frames of R, 10 frames of G and 10 frames of B

-- shoot 3 frames of L and then 1 frame of R, 1 frame of G and 1 frame of B and
-- repeat this sequence 10 times
?

Thanks!
Max S.

RPI 4 B (4Gb) with SMate
Askar FRA400, TPO RC6, Nikon D5500 full spectrum (with IDAS clip-in filter).
ASI2600MC Pro
ZWO ASI120MM Mini on ZWO 30F4
ZWO ASI224MC-S on Orion 50 mm f/3.2
ZWO EAF x 2
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Last edit: 1 year 1 week ago by maxthebuilder.
1 year 1 week ago #65728

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Easy with the scheduler - simply setup a Sequence with your simple pattern (3/1/1/1) and then get teh Scheduler to "Repeat" the sequence 10 times.

Personally and from experience, I WOULD NOT recommend it for two reasons;
#1 Flats. In my experience unless you've got a very accurate filter wheel, the chances of it changing dust patterns between shots is high every time you move the filter position. at a minimum set your wheel to be unidirectional, helps to counteract backlash.
#2 Focus. Unless you're confident in your filters being parfocal, you're going to need to adjust focus for each change, again, this might require a lengthly refocus routine unless you have a very accurate focuser able to move between focus offsets (this becomes more important at faster f-ratios where the CFZ is tiny).

There is a good reason to take the approach you outlined and that is of course that you are more likely to get even sky coverage from shot to shot but this brings me to my final piece of advice;
#3 - shoot one filter per night, with multiple targets if you've got time to kill versus multiple filters one target - that way you get consistent elevations per target per filter, at the risk of being clouded over the following night. Having said that I know people who've been shooting the same target for years at a time, building up data as they go.

If this sounds like Mono+filters is more complicated and fiddly than OSC, it's because it is - shooting with filters is really rewarding but it's a more methodical mindset than OSC.
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Last edit: 1 year 1 week ago by Paul Muller.
1 year 1 week ago #65731

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xthestreams,
Thank you so much - your reply is very helpful!
Max S.

RPI 4 B (4Gb) with SMate
Askar FRA400, TPO RC6, Nikon D5500 full spectrum (with IDAS clip-in filter).
ASI2600MC Pro
ZWO ASI120MM Mini on ZWO 30F4
ZWO ASI224MC-S on Orion 50 mm f/3.2
ZWO EAF x 2
SW AZ-GTi
SW HEQ5
RST-135
1 year 1 week ago #65743

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Hi there,

Sorry for bumping this thread, but it's just was I looking for. Paul's tips are very useful, I agree. However, I'm trying to setup this kind of cycling shooting but I want to dither in every loop (this kind of imaging, by the way, can avoid wasting too much time for dithering). Is this possible? How can I dither between loops? If this is not possible natively, can I run a particular script in every loop? The idea is to run a python script to perform send a manual dither to phd2. I've been tinkering for a while but cannot find the way.

miguel
1 month 3 weeks ago #78000

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Perhaps set dithering to once every 4 frames in Guide options?
Jasem Mutlaq
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1 month 3 weeks ago #78005

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yes, that is the only solution that came into my mind. I have to test it and check if suits my needs. Thanks for the reply
1 month 3 weeks ago #78008

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Hi Jasem. Unfortunately, this does not work. Looping for example through 20 LRGB loops (scheduler, "repeat for"=20) and dithering every 4 frames, does not never dither. I have to dither every <4 frames. It seems that when it finishes a job (.esq), it doesn't take into account that another loop is coming.
any ideas?
1 month 3 weeks ago #78044

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The way I set this up is to create a sequence in the ccd section. I generally do 20 x L, 10 x R, G, B (each). After entering the first 4 entries, I select the first and hit the + button above the sequence. Then repeat this for the other entries. The + button duplicates the selected entry. Finally, I save the sequence for use in the scheduler.
I have no problem with flats, either dust is very sticky or the wheel rotates without issues. But I do have it set to use only one rotation direction.
Dithering is set to every 3 exposures. Also, no issue here.

Hope this helps
Wim

Opticron Oregon 15*70, Skywatcher 150PDS + ST80, AZ-EQ6 GT + EQ3-2 Goto, ZWO ASI174MM-Cool + Pentax K20D (retired) + ZWO ASI120MM, homemade ditherbox, PixInsight, Rock64 x 2 with INDI & PHD2, cloud cover

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1 month 3 weeks ago #78119

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This thread leads me to another question. Since sequence settings apply only to a particular sequence, if I want to refocus every 30min in a scheduled job (with a duration of several hours) but that job is linked to a sequence of 15min duration (the sequence would repeat several times in the schedule definition), I guess it will never refocus. Am I wrong?
1 month 3 weeks ago #78155

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