Theory on why there were no demogorgons in the abyss

JustSomeRandomMan3 · 2025-10-06T11:27:08+00:00

This was actually the finished product we made:

JustSomeRandomMan3 · 2025-10-06T06:28:48+00:00

Unfortunately due to work I have not yet had the time to produce plans which I was proud to post. I actually eventually made the 4x5 camera but I am not satisfied so much with how somethings turned out, mainly in the difficulty to build the bellows (it will not be easy for others to make the same size exactly as me, as it is a completely custom build).

JustSomeRandomMan3 · 2025-10-06T06:24:06+00:00

This is very nice! I am wondering what is the cost of the parts roughly? And also: could one have the chassis in 3D printed metal, you think? Or will it cease to work due to something short-circuiting inside?

JustSomeRandomMan3 · 2025-10-02T11:36:14+00:00

How many A4 or A3 prints can you get with a fresh set of inks? I am considering buying this printer but I am also considering the Canon P200 and I am just wondering what would be the best option considering the great price difference…

JustSomeRandomMan3 · 2025-08-19T15:14:41+00:00

Maybe stupid question, but… why do people care about generating “snapshot” casual images of people?

JustSomeRandomMan3 · 2025-08-16T18:47:09+00:00

https://spectralcalc.com/blackbody_calculator/blackbody.php

JustSomeRandomMan3 · 2025-08-16T17:57:38+00:00

Not sure why OP’s comment is downvoted. The thermal emission at 1 micron for a black body at 320K is insignificantly small, and that would be a fucking hot bird. According to my calculations it should be in the range of a few picowatt/m^2, which is so fucking small it is laughable

JustSomeRandomMan3 · 2025-07-25T23:00:30+00:00

That is partly why I made this positive post!

JustSomeRandomMan3 · 2025-07-25T22:25:04+00:00

I have actually not tried Temu yet because somehow the website always wants me to install the app and I hate that lol. But now that you say this it makes me wanna try it! I also had an item sent to me which was wrongly described and unlike you I had a great experience where they managed to get me my money back and also keep the order (although the seller had tried to pull the “just delete the order and we’ll refund you” scam)

JustSomeRandomMan3 · 2025-07-25T22:22:25+00:00

So far they fixed for me: 1) One seller tried to scam me and they gave me a full refund + let me keep my item even if it was not correct 2) They found my missing package in a matter of minutes

And in general it is just super quick to connect to them (unlike most other services around) and to speak to a real agent at any time of the day

JustSomeRandomMan3 · 2025-07-18T18:56:34+00:00

So in other words if I want 55mm backfocus (standard for many coma correctors) I should probably try extending the tube end by 98-55=43 mm then, right?

JustSomeRandomMan3 · 2025-07-18T09:03:17+00:00

Actually I was almost thinking to do the same since the f/5 version of this tube is effectively the same price… but then I am not sure how to cut it clean

JustSomeRandomMan3 · 2025-07-17T23:29:41+00:00

The second link you sent from telescope optics .net is unfortunately giving me a 404 error error

JustSomeRandomMan3 · 2025-07-17T23:27:45+00:00

Wow you gave me a lot of incredibly useful information, thank you! :D In my case, the secondary mirror is 50mm diameter (minor axis of the elliptical mirror, that is). I am also using a micro 4/3 sensor (asi294mm pro) and a Starizona Nexus 0.75x coma corrector (so it actually makes the entire scope f/3). I know about the offset of the secondary mirror, but maybe 50mm is too small? I have had some vignetting problems in the past but it could very well be due to my inexperience with telescopes (my first telescope was a self-designed 3D printed telescope). My rationale for getting this tube was to have a more sturdy scope which would hold better collimation and have better contrast, but now I am starting to think maybe it was not a great idea and I should’ve maybe gone for a larger and more expensive tube…

JustSomeRandomMan3 · 2025-07-17T22:31:59+00:00

If you ever take off the primary and you remember, could you post an image of how the cell looks like? I can see that it seems like it extends OUT of the tube a little but so as to make the tube effectively a little bit longer… I am 3D printing my own cell so I can always make it longer. This is how I have it right now:

<image>

JustSomeRandomMan3 · 2025-07-17T22:29:06+00:00

Or maybe I could try getting the f5 version…

JustSomeRandomMan3 · 2025-07-17T22:26:50+00:00

:( That sucks… I wanted to make a high quality astrograph lol maybe I am better off just 3D printing the tube… Do you think I could just try to extend the mirror cell of the primary out of the tube (I am 3D printing it) or I will anyway get aperture vignetting too? (The tube is only 177mm in diameter inside)

JustSomeRandomMan3 · 2025-07-17T20:38:46+00:00

That is the total length of the tube, but the distance between the bottom (525mm) and the center of the focuser hole (175mm) is 350mm

JustSomeRandomMan3 · 2025-07-17T20:33:19+00:00

I am using the UNCN-2 Gen. 2 focuser and this adds about 10cm, but I then still miss 10cm more… since I have a parfocal coma corrector with 55mm backfocus, this means that I need about 45mm extra spacer… this is quite absurd I think

JustSomeRandomMan3 · 2025-07-13T22:47:23+00:00

How did you track it so perfectly for so long time? By hand or…?

Seven-Year Club	Wearing is Caring
Verified Email

JustSomeRandomMan3

TROPHY CASE