But you can decrease it. Here's why. Introduction to Deconvolution Part II
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- เผยแพร่เมื่อ 10 ก.พ. 2025
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Ever wonder why people talk about "PSFs" in astrophotography? Well, a PSF makes your image blurry, so your can never have a perfect image. I go into detail about what can affect a point spread function in this video.
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Also, note that the 134/D formula is in arcseconds. (1.22 x lambda)/D is in Radians!
Hi. Nice video. did I understand correctly?
For my telescope 8"
D = 203.2mm
λ = 0.000656 mm (H-alpha filter 656 nm)
R = (1.22 * 0.000656) / 203.2
R = 0.000003228346457 rad
R = (0.000003228346457 * 3600 * 180/π) arcsec
R = 0.6658942564 arcsec
@@8gonzalo411 Yes! That looks right to me! The quick and dirty formula (134/203) gives about 0.65, so a similar answer!
Side note: I wish I had made it clear in the video that the second formula was for radians.
MUCH BETTER! This video was so much easier to follow without the distractions during the more technical bits. Do you think it would be worth calculating the point spread function for different parts of an image to take into account field curvature etc?
That's the goal. But it will take some time to train the model(s) correctly.
Most critical contributor for resolution is seeing. Rest is minimal. Large scope increases sensitivity, but resolution is still mainly defined by seeing.
Yes! Which I discuss it being the most important factor around 12:50 ;)
@@deepskydetail It will be great to present practical aspects related to pixel of camera and FL of scope, etc. For example, do we need 14”scope with FL 2500mm, if we have SCT 9.25” FL 2500mm, our seeing (2-3”; most common good seeing) and camera asi2600.
This was an excellent explanation of psf! Thanks for sharing the knowledge!
Glad it was helpful!
Well I learn something every time.
Thank you! You've made my day :)
Field curvature is similar to Coma where off axis light is is focused before it gets to the sensor like you'd need a curved sensor for the edges to stay in focus. What you showed instead is spherical aberration where light that went through the edge of the lens is focused before it gets to the sensor.
Yes, you're right! Thanks for pointing that out. The visual is misleading. I should have had incoming non-parallel to the axis rays being focused for the field curvature demonstration.
Theses videos keeps getting better and better hahahaha thank you friend!
Glad you like them, friend!
Another incredibly informative video - Thank you so much!
I have fun making them. And thank you for watching! :)
Don't forget the atmosphere. It limits seeing to usually above what the average astrophotographer's scope can resolve.
EDIT: He did infact, not forget the atmosphere.
First time to your channel. Subscribed.
Loved the laser/fishing line demo! So... when you integrate that diffracted output image from 0 to 180deg(or 360?), then your result is the airy disk. ?? So obvious now but never "got it" till I saw your little experiment. thx!
Thanks for the sub! I appreciate it! I'm glad you liked the demo. When I saw that demo as I was preparing to make the video, it clicked with me too. There's so much I learn as I'm doing this that I think, "I've got to share this! It's really cool!" :)
Brooo, everything made sense now
Blurry pics come again no more.