I am wanting a new camera, NOT DSLR.

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I am wanting a new camera, NOT DSLR.

Postby EIZO » Thu Feb 08, 2018 10:30 am

Simple question or not

I am wanting a new camera, NOT DSLR.

1. Why when large sensors are now available in cameras for £500 at 12+MP are there still 2MP cameras available costing more, what is the point of a small MP camera when 12mp + are available

Wanted for imaging Moon, Sun (PST)

Thank you
Celestron Edge 8" Evolution, Esprit 120mm triplet, Sky Tee2, William Optics Binoviewers, many 2" eyepieces. Nikon D4s, D810, Nikkor 70-200 F2.8, 14-24, 70-200, Sigma 150-600 Sport, Gitzo tripods
EIZO
 
Posts: 156
Joined: Sun Nov 26, 2017 9:09 pm

Re: I am wanting a new camera, NOT DSLR.

Postby Gfamily2 » Thu Feb 08, 2018 2:47 pm

As you'll know, Megapixel count is a function of pixel size and overall sensor size (as well as bit depth)

Reduce the pixel size and you get fewer photons included in the signal from each, so the signal/noise ratio is lower. So, depending on the sensitivity of your pixels, you might prefer a larger pixel (hence lower pixel count) so that you can get a better image from a faint signal (from DSOs)

For other targets; given that it is often best to capture and stack a video stream for brighter objects like the Moon, planets and the Sun, so reducing the sensor size allows you to increase the frame rate you can capture, giving you more images to stack, and more chance of picking up excellent moments of image clarity.

Then there's the point that Mono imaging uses 1/3 the number of pixels, so you can get the benefit of using larger pixels (hence more sensitivity) to capture the same level of detail as a colour camera. Mono means you should be able to do better imaging using filters, either for specific elements, or for RGB composite imaging.

For imaging systems, there is consideration about the arc seconds per pixel count, but that's for more advanced users than me.
Scopes: Meade 8" SCT, Skywatcher 127mm Mak
For imaging: Pentax K5, Asda webcam, Star Adventurer (new toy)
For companionship: Mid Cheshire Astronomical Group.
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Re: I am wanting a new camera, NOT DSLR.

Postby EIZO » Thu Feb 08, 2018 4:24 pm

So you are saying :) :) :)

For imaging the Moon/Sun trading off points against points what would be a good all round camera

Monochrome or Colour
Large sensor or small
12Mp or 2Mp
Celestron Edge 8" Evolution, Esprit 120mm triplet, Sky Tee2, William Optics Binoviewers, many 2" eyepieces. Nikon D4s, D810, Nikkor 70-200 F2.8, 14-24, 70-200, Sigma 150-600 Sport, Gitzo tripods
EIZO
 
Posts: 156
Joined: Sun Nov 26, 2017 9:09 pm

Re: I am wanting a new camera, NOT DSLR.

Postby Gfamily2 » Thu Feb 08, 2018 6:11 pm

You could say that:
you could also say it's horses for courses.

For AP, it's probably better to say there is no "good all round" camera - at least not one that is 'really good at everything', just as there is no telescope that is 'really good at everything'. There are always compromises to be made, in particular when considering the range of light intensities that we are dealing with: planets being easily imaged at 30fps vs narrowband DSO imaging using 600s exposures.
Scopes: Meade 8" SCT, Skywatcher 127mm Mak
For imaging: Pentax K5, Asda webcam, Star Adventurer (new toy)
For companionship: Mid Cheshire Astronomical Group.
Gfamily2
 
Posts: 324
Joined: Thu Jun 25, 2015 10:38 pm


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