QHY don't just do amateur cameras

[DaveS]

I'd seen some of these on their site, but Baader have prices and can order for you. Better have won the lottery first though.

Here

[iapa]

That’s where to spend my £130m lottery win once I have my equator mid pacific island.

Would Bikini Atoll for the bill?

Edited April 27, 2021 by iapa

[Paul M]

Yikes!

For less than £52k I can have a 4.2" chip. My finger is hovering but I'll need to check if my 250P-DS can fully illuminate it first! 🤣

[Alien 13]

Nice but chips are a bit small and would want USB-C/Thunderbolt connectors rather than USB-3 for that money 🙂

Alan

[DaveS]

14 hours ago, Alien 13 said:

Nice but chips are a bit small and would want USB-C/Thunderbolt connectors rather than USB-3 for that money 🙂

Alan

A bit small? 50 x 40 mm or even 60 x 60 mm? How big do you want?

Actually gigabit ethernet would be a better option than USB3 Thunderbolt is just too flakey for scientific cameras.

[teoria_del_big_bang]

I was worried then I noticed that it was Euros and not GBP so actually under £54,000 so means I can afford the bigger NB filters as well - I Wish 🙂 

Steve

[JamesF]

29 minutes ago, teoria_del_big_bang said:

I was worried then I noticed that it was Euros and not GBP so actually under £54,000 so means I can afford the bigger NB filters as well - I Wish 🙂 

Or you could build a triple rig...

James

[sloz1664]

Looks like I've got to sell the Ferrari then 🙄

Steve

[Alien 13]

7 hours ago, DaveS said:

A bit small? 50 x 40 mm or even 60 x 60 mm? How big do you want?

Actually gigabit ethernet would be a better option than USB3 Thunderbolt is just too flakey for scientific cameras.

I was thinking a pro camera would want a pro scope which probably has a much larger imaging circle than 60mm, even my old bino objective can project an image a foot across although its in no way corrected.

Alan

[DaveS]

Even the Liverpool Telescope in La Palma only has a 60mm square sensor.

Beyond that the sensors are one-off custom designs.

[Paul M]

I wonder what kind of optical system could adequately illuminate a 4.2" sensor?

And would my EQ6 Pro be ok?

[DaveS]

A Tak FSQ106 will cover 88 mm so good for a 6060 sensor, well at least theoretically. Not many telescopes are well corrected beyond, I think, 60 mm and even that's pushing it.

[Alien 13]

31 minutes ago, Paul M said:

I wonder what kind of optical system could adequately illuminate a 4.2" sensor?

And would my EQ6 Pro be ok?

Dont you mean 2,4 inches, which to me is tiny..

Alan

[DaveS]

1 hour ago, Alien 13 said:

I was thinking a pro camera would want a pro scope which probably has a much larger imaging circle than 60mm, even my old bino objective can project an image a foot across although its in no way corrected.

Alan

Well that's effectively eyepiece projection, not prime focus imaging.

[DaveS]

8 minutes ago, Alien 13 said:

Dont you mean 2,4 inches, which to me is tiny..

Alan

Can you point me to a commercially available camera with a sensor larger than 60mm square? If you want bigger then you'll either have to have 6 or 7 figure sums for a custom built observatory class camera, or else revert to silver halide and large format film.

And find a telescope with a big enough prime focus imaging circle.

Edited April 28, 2021 by DaveS

[Paul M]

12 minutes ago, Alien 13 said:

Dont you mean 2,4 inches, which to me is tiny..

Alan

Ah, I just saw 4.2" but it 54 x 40 mm

 

Edited April 28, 2021 by Paul M

[Alien 13]

2 minutes ago, DaveS said:

Well that's effectively eyepiece projection, not prime focus imaging.

No it was just the objective lens, remember those vintage plate cameras with a very large sensitized glass plate at the rear...

Alan

[DaveS]

The "inch" size is a long obsolete measure dating back to vidicon TV camera tubes.

[Alien 13]

1 minute ago, Paul M said:

Oops missed that one a 10cm sensor is big..

Alan

[DaveS]

1 minute ago, Alien 13 said:

No it was just the objective lens, remember those vintage plate cameras with a very large sensitized glass plate at the rear...

Alan

Well OK, but what was it's poly Strehl?

[Alien 13]

Just now, DaveS said:

Well OK, but what was it's poly Strehl?

It does indicate that most scopes throw 90% or more of the light gathered away..

Alan

[DaveS]

I have an 10x8 monorail camera, and a couple of lenses that will cover the image circle, but doubt they are anything like diffraction limited (0.84 Strehl) at any aperture, let alone wide open.

Edited April 28, 2021 by DaveS

[DaveS]

2 minutes ago, Alien 13 said:

It does indicate that most scopes throw 90% or more of the light gathered away..

Alan

Eh?