Excellent tutorial! I recently did a spreadsheet for all 3 of my astro rigs, so I could quickly & easily calculate dither scale off of image & guider scale values. I need to double check my dither settings before my next clear night...whenever that may be! LOL
First time it all makes sense - thank you thank you thank you!. Also so timely I was just venturing into dithering. I also added all the formulas to my Astro Logbook spreadsheet so my chosen Light Train includes the Dither settings for me! Did I say thank you...
You don't need to multiply by 206.256 (which is the conversion factor for radians to arc/secs). Answer is the same since the 206.265 cancels out. Unless you also want know the actual arc/secs per pixel.
That's a good point. I wish I had thought about it. I always forget about that since I live in an area with no meaningful light pollution ergo binning rarely ever is productive for me. But if binning, just add the guide camera pixels by however much is binned. So, if binning 2.9 mm pixels 2x2, then calculate the guide cam pixels as 5.8.
I tried binnning a couple of times and I was not totally happy. Though I reckon I'm kind of obsessed with high res (and my storage and processing time pay anice toll for that :D )
Are you referring to the Sequencer option that asks how frequently to dither? If I were to shoot over 5 minutes subs, I'd dither every frame. For subs under 5 minutes but over 2, I dither every 3 frames. For subs down to 1 minutes, once very 5 frames I find to be plenty.
Thank you! I use for the maine camera 3,75 pixel size on 1000mm, and Off axis guiding also 3,75 1000mm- means both values x 206,265 is 0,77349. Means how much pixel i should write in Nina? Is it 0,77/0,7= 1. 10/1= 10 Pixel?
If there is no difference between your guide camera's pixels and your imaging camera's pixels, and you are using an OAG so they are both working from the same optical tube, then their relationship is 1:1. That's the simplest possible setup and you can just determine and write in how many pixels you want your software to dither.
The only time you must really calculate your dither is when you rely on drizzling your data because of low resolution pixel related to your telescope. Then you have another formula to guarantee a number to help the drizzle algorithm
Excellent tutorial! I recently did a spreadsheet for all 3 of my astro rigs, so I could quickly & easily calculate dither scale off of image & guider scale values. I need to double check my dither settings before my next clear night...whenever that may be! LOL
First time it all makes sense - thank you thank you thank you!. Also so timely I was just venturing into dithering. I also added all the formulas to my Astro Logbook spreadsheet so my chosen Light Train includes the Dither settings for me! Did I say thank you...
Really excellent thank you!
Timely video, I will use this guidance tonight, when setting up dithering settings.
Fantastic!I can listen to your voice for hrs!very soothing mate
So clear and concise, now I've actually got Phd2 working ( mechanical issues) I can find tune instead of guessing , now how often should I either 🤔!
Glad it helped!
You don't need to multiply by 206.256 (which is the conversion factor for radians to arc/secs). Answer is the same since the 206.265 cancels out. Unless you also want know the actual arc/secs per pixel.
True and thank you
Many bin thier guide camera.
That's a good point. I wish I had thought about it. I always forget about that since I live in an area with no meaningful light pollution ergo binning rarely ever is productive for me. But if binning, just add the guide camera pixels by however much is binned. So, if binning 2.9 mm pixels 2x2, then calculate the guide cam pixels as 5.8.
I tried binnning a couple of times and I was not totally happy. Though I reckon I'm kind of obsessed with high res (and my storage and processing time pay anice toll for that :D )
@@CGastro I agree. I'd rather the higher res I get from not binning.
Excelent lesson. Hope this can fix some banding I could not find the reason for. Any advise on the dither-every parameter?
Are you referring to the Sequencer option that asks how frequently to dither? If I were to shoot over 5 minutes subs, I'd dither every frame. For subs under 5 minutes but over 2, I dither every 3 frames. For subs down to 1 minutes, once very 5 frames I find to be plenty.
@@SKYST0RY That makes a lot of sense to me. Thank you so much.
@@SKYST0RY So 30 second subs dither every 5 frames? Did I get that right!
Thank you! I use for the maine camera 3,75 pixel size on 1000mm, and Off axis guiding also 3,75 1000mm- means both values x 206,265 is 0,77349. Means how much pixel i should write in Nina? Is it 0,77/0,7= 1. 10/1= 10 Pixel?
If there is no difference between your guide camera's pixels and your imaging camera's pixels, and you are using an OAG so they are both working from the same optical tube, then their relationship is 1:1. That's the simplest possible setup and you can just determine and write in how many pixels you want your software to dither.
The only time you must really calculate your dither is when you rely on drizzling your data because of low resolution pixel related to your telescope. Then you have another formula to guarantee a number to help the drizzle algorithm
Clever.