Sirius

[rare pulsar]

Just an experimental shot using the guiding camera to capture those beautiful Sirius spikes

114/900 Exos 2 with onstep and Sv905c
100x10s
São Paulo, Brazil. Bortle 9

[waxen prism]

can i get those straight diffraction spikes pleeease

[little oxide]

throwing flashbang

[woeful patio]

why does it look like your out of focus?

[tawdry marten]

He's using a guide cam

The sampling was likely wayyy finer than the seeing was

[woeful patio]

yea but its in a different way..

the core looks shifted

[tawdry marten]

Stars have proper peaks and troughs so idk, looks fine to me.

[woeful patio]

yea they look fine im just looking at this^

[tawdry marten]

Yea idk that is weird

[little oxide]

The circle of the star looks misaligned with its diffraction spikes

[woeful patio]

maybe its the scope? just so zooomed in the coma is more apparent?

[tawdry marten]

Yup, could be collimation also.

[woeful patio]

oh

OHH

you are out of focus

[tawdry marten]

If blurX was used then it's difficult to say regardless.

[woeful patio]

very hard to see but

[cobalt hinge]

Probably collimation more than anything

[rare pulsar]

It's probably slightly out of focus.

[little oxide]

looks more like a collimation issue to be honest, the diffraction spikes are really sharp, the focus is probably fine. They're just misaligned, indicating the mirrors might be just barely misaligned

[rare pulsar]

It's not collimation. The spike generated by the 3-vane spider works like a Bahtinov mask. It only aligns and becomes symmetrical when it's perfectly in focus

I'm still finishing my diy electronic focuser, so manually it's a bit annoying to reach perfect focus with this huge crop factor of the planetary camera.

[little oxide]

Ah ok, neat

[rare pulsar]

It´s better to see without strech

[rare pulsar]

I stacked with drizzle, but I think it's more the Discord compression that's ruining it
Check the XISF. It's without BlurX

This camera has only 1280x960 resolution. Very small sensor.
I took this photo just to test the resolution of the spikes, since with the phone, due to the distortions and reflections of the eyepiece, they don't come out this perfect

[woeful patio]

use some lego

great idea

trust

[lilac otter]

Capella. I got all em diffraction spikes

[cobalt hinge]

"How much diffraction spikes do you want? Yes..."

[lilac otter]

I'm not a psycho tho. I was just checking the colimation of the telescope. And an overall optics test 😂

[cobalt hinge]

I guess it passed with flying colors 🤘

[lilac otter]

Kinda... only issue I had was that the stars were triangular

Apparently you can bend a 1inch thick hunk of glass just by a 1/4 of a turn of a fine pitch screw🤣

[harsh gust]

whatt kind of diffraction mask did you use

the spikes almost look fake when looking at it zoomed out because the stars look out of focus

if they were out of focus the spikes would be too but they arent

[lilac otter]

Tribathinov mask

[harsh gust]

interesting

[lilac otter]

A tribathinov mask has the ability to tell you if the telescope is properly colimated and helps you achieve perfect focus. It's weird what happens. On newtonians. The smaller stars are technically visible. There's a diffraction ring created between the star and where the spikes actually starts. I learned that ring is created by the shadow of the secondary mirror.

Also I 3D printed the mask because it was cheaper😂

[harsh gust]

oh yeah i searched it up but how much easier is collimating with it compared to just doing regular star tests which involve checking the "donuts"

[harsh gust]

haha if it works as intended its even better i would say

[lilac otter]

Works great! And I recommend to everyone without an EAF... if you have a 3D printer, just print a bathinov mask. I know you can buy one for 20/30 € but with 20€ of filament you can print dozens of bathinov masks😂

[harsh gust]

i have problems with collimating rather than focusing since for that i just get rougly in focus and look at the fwhm till i get the lowest possible

i dont own a 3d printer however my mother has one in her school that she works at so i might ask her if i could print something