This picture is taken with a 120mm lens on my camera that was hooked onto my telescope mount so it could track and not get star streaks. 25 30 second individual images stacked together to reduce the noise level. The noise goes down as the square root of the number of pictures so doing 25 pictures will reduce the overall noise level 5 fold. Noise in dark images causes the little colored speckles in the darkest parts of the picture. Ion trail is on the left and dust trail on the right.
One picture 10 second exposure 3200 film speed 120 mm fixed on tripod so rocks are in good focus but stars have some trails. The rock is lit up by several lights that are at the north end of the Village of Oak Creek. Primarily a Speedway gas station that has brighter lights than it should. The streak is a Russian rocket booster still in orbit after several years.
Here is a 10 second picture just like the one above except it is taken from the telescope mount and tracks the stars which are real sharp in this picture but the rocks are a little blurred. No Rocket booster in this one. This picture is made up of 25 images and the stars and comet is sharp but the rocks are really distorted since each picture is taken by the camera in a different position. The stars are aligned for stacking for a sharper comet and star image.
The image below is taken by a 714 mm refractor telescope to get up close. This was 25 images stacked. Notice the blue glow of the ions in the head of the comet. The apparent size of the comet is about as big as a planet but the actual comet nucleus is only a few Km. in diameter and wouldn't even be visible without the dust and gas being spewed out of it.
The Andromeda Galaxy only 2.5 million LY away and is relatively bright. This image is made by taking 25 3 minute images and stacking them with Deep Sky Stacker and then processing it with Lightroom to get more contrast and detail. The telescope is an 8 pound 4 inch diameter F7 714 mm telescope with a carbon fiber tube to make it really light. This probably is my best image and is 14 Mb.
These are either dust clouds that reflect light from bright stars or gas that gets excited by UV light and then emits at different wavelengths according to the gas that is present. Brighter ones can just be seen in binoculars. Most of these require 20 to 30 3 to 5 minute exposures to get a good image. The Orion Nebula is the brightest one and you can actually get a good image with just one picture since it is bright and it doesn't have as much noise. The picture is still better with stacked images and total exposure of about an hour. These images show improvement over time learning the skills to do it. Orion 4 seconds with 300 mm F 5.7 telephoto zoom lens. Just one picture with lots of noise in it. This was just taken on a tripod.
Several images stacked and tracked to get rid of noise.
40 1 minute images with Nikon D750 and telescope. I have a new astrocamera that will get better images this winter from Orion Nebula.
Eagle Nebula. About 2 hour total exposure taken with Nikon camera.
This is same nebula taken with a ZWO ASI294 astro imaging camera that is cooled to -10 C which reduces noise and it is also more sensitive to hydrogen alpha (deep red). It almost looks like a different nebula. 2 hours total exposure.
The dark read splotches in the middle of the nebula are the famous Pillars of creation that were made famous with an image from Hubble. This image is done with my 4 inch telescope in my back yard.
Here is the image taken with the $10 billion plus hubble. You can see the pillar in the middle and the projection to the right of it in my image. The Hubble picture was taken in infrared and strange wavelengths of light to bring out things almost in 3 D.
Here is a 60 minute image of the Lagoon Nebula with my Nikon camera.
Same Nebula with the astro camera cooled to -10 C. This is the prettiest nebula picture so far. This has lots of Hydrogen alpha that the Nikon won't pick up because it has an IR filter that takes most of H Alpha out.
These images that are taken at high magnification of about 400 X with a 10 inch reflector. These are done by taking movies with about 2000 frames and letting software pick out the best 5% or so and stacking them.
Full Moon by Astrocam Video stacked stitched and woked on and flipped.
Moon full resolution.
Jupiter July 4, 2020.
Moon new camera.
Saturn July 4, 2020.