Questions tagged [photography]

Questions about photography of celestial objects by amateur or professional astronomers. Questions about photography of other objects are off-topic but might be asked on our sister site Photography Stack Exchange.

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What is this cluster of light trails captured on long exposure images?

I was taking photos of the Perseids meteor shower on 13/08/2022 in Peak District in the UK. The camera was fixed stably on a tripod, set on manual mode, taking 8-second exposures continuously. When I ...
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iOptron ZEQ25GT mount advice needed

I am interested in purchasing a used iOptron ZEQ25GT mount which is a being sold at $500 by an experienced owner. It is in good condition. Can someone share their experience on using this mount, or ...
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1 vote
1 answer
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Astrometry and Geometric Distortions

CCD's are widely used for astrometry. Since a spherical surface (the celestial sphere) is projected onto a rectangular surface, the plate scale or pixel scale (approximated with 1/focal length etc) is ...
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Curved milky way image [duplicate]

In today's microsoft bing https://www.bing.com/ background image the milky way is seen as curved. How is this possible?
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In this image taken by Voyager 1, which is closer: the earth or the moon?

NASA reports this photo was taken 19 Sep 1977 by Voyager 1: It doesn't strike me as obvious how to determine which celestial body is closer to Voyager 1 as the photo was taken. My (not very ...
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1 vote
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How to calculate shooting distance for an astronomical object

With a 50mm full frame lens and a 35mm sensor (or film), how far should I be to shoot Earth with earth’s edge just inside top and bottom edge of the resulting image? I don't want any cropping. Earth ...
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3 votes
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Is there a website or app that can add declination and RA grid to an existing photo?

For a few years now, I've been shooting photos of the night sky with just a tripod and my Nikon DSLR. After extensive post-processing to mitigate light pollution, I usually submit the final results ...
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6 votes
2 answers
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Finding Scorpio in the Milky Way panorama

I'm searching for the constellation of Scorpio in this image. Unfortunately this is a task too hard for a newbie like me, so I would like to have an hand about that.
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1 vote
1 answer
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How far above the galactic plane would a telescope array need to be in order to image the whole galaxy?

I hope this isn't a stupid question, but Google searches are turning up nothing relevant. I was just thinking about how it's difficult for us to determine the true shape and composition of the Milky ...
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What settings should I use for my telescope-mounted smartphone to take night sky pictures?

Last night, I managed to take my first successful picture of a nebula--the Orion Nebula (see picture below). I'm incredibly ecstatic, as before I had been limited to taking images of the moon. I used ...
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3 votes
1 answer
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Camera settings for Astrophotography

I own an Orion 10015 StarBlast 4.5 Astro Reflector Telescope and I recently bought a Lumix G7 camera then I bought the adapter needed to attach the camera to the telescope. I tested it today at ...
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9 votes
1 answer
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How to determine the scale on astronomical images?

I've always been amazed at the many beautiful images of objects in the night sky. The Andromeda galaxy is a superb example. But it was only a few years ago that I discovered that Andromeda in those ...
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34 votes
2 answers
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Why does the alignment evaluation image from JWST look like this?

NASA has just released a telescope alignment evaluation image from JWST for the star HD 84406 2MASS J17554042+6551277. It looks like this: Higher resolution at Wikipedia To my untrained eye, the star ...
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What is Canopus in this picture?

Picture is taken from 34.2N 126.6E Bogil-do, South Korea. I suppose the dot at up-right side is Rigel and the bright white dot is Sirius, and bright reddish dot at the bottom is light from some ...
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4 votes
1 answer
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What have I encountered here?

Consider: I tried Google Lens to tell the answer, but it is not giving a true answer. I am using the Android app Stellarium.
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2 votes
1 answer
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Camera adaptor won't focus [duplicate]

I'm trying to use my DSLR camera (Canon EOS-40D) with my kids' Celestron First Scope. I bought a 3x Celestron 1.25" barlow, Celestron 1.25" T-adaptor, and the Canon ring. These things all ...
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What is the actual center of galaxy in this image

NASA picture of the day February 2 2022. What is actually the center of the galaxy here? Is it the bright star or something nearby it?
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1 answer
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Avoiding noise while stacking multiple night sky photographs

I have always been fascinated by astrophotography and have been trying my hands at the skill. I have tried photographing the milky way with limited resources (smartphone with a tripod). I usually ...
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3 votes
1 answer
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What are some astrophotography editing options and strategies for taking photos of galaxies with a telescope and a cell phone?

We purchased a phone adapter for my sons telescope and got some amazing pictures, BUT we believe that they can be clearer. What is the best, or a really good, image editing program for amateur ...
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3 votes
1 answer
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Hoping to do some viewing and astrophotography with a large-ish Dobsonian and a DLSR, is this scheme workable?

I haven't put a camera behind a telescope since the lunar eclipse of 1975 except for a few experiments with a cell phone held behind a pair of binoculars. I want the occasional thrill of using a ...
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3 votes
2 answers
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How to compute a Flux through a filter using SYNPHOT in Python

I am in the process of building an exposure time calculator to help nail down the exposure times I need for different targets in my observatory. In amateur astronomy imaging, we use a filter called ...
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Did astronomers ever use photographic plate rotation along with alt-az mounts?

The video Earth's Rotation Visualized in a Timelapse of the Milky Way Galaxy - 4K (linked below) and discussion below this answer to Why does a timelapse video of a stationary Milky Way make the ...
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2 votes
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What are the technological advancements that made it possible for modern large telescopes to work with alt-az mounts instead of equatorial mounts?

The video Earth's Rotation Visualized in a Timelapse of the Milky Way Galaxy - 4K (linked below) and discussion below this answer to Why does a timelapse video of a stationary Milky Way make the ...
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1 answer
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Are all space documentaries CGI?

Consider the following video by BBC about the Pillars of Creation: According to a quick google search, the POC are 7000 light years away. If we just had a picture of ...
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Do observational astronomers make use of the Fredholm equation? Perhaps in solving for/removing instrumental effects in imaging?

The Fredholm equation of the first kind (Wolfram Mathworld and Wikipedia) written as (Wolfram's): $$f(x) = \int_a^b K(x, t) \ \phi(t) \ dt$$ where $K(x, t)$ is the kernel and $\phi(t)$ is an unknown ...
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6 votes
1 answer
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How did Parker Solar Probe take what looks like 2D cross-sections of the solar wind in photographs; high contrast streaks in focus from volume effect?

The new NASA Goddard video NASA's Parker Solar Probe Touches The Sun For The First Time shows what looks like they might be photographs of the solar wind. I'm having a hard time understanding how such ...
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4 votes
2 answers
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New to Astrophotography

I just had a quick question on my telescope I recently purchased. I have a Canon Rebel XTi and I paired that with the William Optics Guide Star 61 Guidescope. The Specs on the Scope are: Guide Scope ...
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3 votes
0 answers
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What exactly causes very bright sources, such as supernovae, to appear as large circles in photographs?

Consider images such as those in https://hubblesite.org/contents/news-releases/2021/news-2021-007, which show bright supernovae embedded in their host galaxies. No matter which telescope and which ...
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2 votes
2 answers
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How is resolution defined?

So I'm looking at a 1 meter square object in my digital camera. What size of pixel is considered fine enough that the object is considered to be resolved? Obviously a pixel size of one meter squared ...
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5 votes
1 answer
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How was the recently publicized Hubble image of a distant galaxy showing clearly resolved lensed in an Einstein ring produced? When was it produced?

The 24-Sep-2021 NASA Goddard video Einstein Ring Spotted by Hubble and it's Goddard Media Studio's page Einstein Ring Spotted By Hubble discuss the image, but don't really give credit to how it was ...
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2 votes
2 answers
232 views

What is the easiest way to photograph stars during daylight hours?

This is probably going to be a bit of a weird one but here it goes. I was looking to see what the easiest method would be to photograph the heavens during the day time in such a way that the stars are ...
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2 votes
1 answer
173 views

What is the difference between mounted and unmounted filters?

I'd like to know more about filter wheels and filters, but don't know the difference between these types. Can anyone explain (ideally with images)?
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1 answer
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Advice for next steps with astrophotography

Over the last year, I have started to take up the hobby of astrophotography. At the moment I have been focused on planetary astrophotography. Up until now I have been using a Celestron 5SE telescope (...
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2 votes
1 answer
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If Proxima Centauri was replace with a quasi-star, would our telescopes be able to see it in fine detail?

Quasi-stars, if they ever existed, were stupid big and stupid bright; many times bigger, brighter, and more massive than any star supported by fusion can be. There's no question that it could be seen ...
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4 votes
0 answers
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Comparing Observing Techniques to Quantify the Effects of Starlink Satellites on Astronomical Observations

To take pictures of satellites I think I could use these methods listed below (are there more?) Method 1 The satellites are tracked and their positions predicted. By utilising software tools and code ...
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1 vote
0 answers
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How to determine time when a photo of star trails was taken?

I was asked to define a time (most likely the month) and location of the picture below. I hope I understood it right that it is the south pole, because we don't see a Polar star in the middle. ...
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1 vote
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How does speckle imaging fit in to 21st century high resolution imaging from ground based observatories?

Phys.org's Astronomers uncover evidence that there could be many more Earth-sized planets than previously thought references Speckle Observations of TESS Exoplanet Host Stars. II. Stellar Companions ...
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0 votes
1 answer
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How can we count layers of atmosphere? [closed]

How can we count layers of atmosphere even though there are no lines or boundaries which separate atmosphere?
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2 votes
1 answer
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What was the first use of time-delay integration in Astronomy? Are there instances before GAIA?

In the context of GAIA, time-delay integration is the clocking of a CCD's charge shift register at a frequency such that it matches the linear speed across the focal plane of the actual image. So even ...
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2 votes
1 answer
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What telescopes used 1000+ pixel Microwave Kinetic Inductance Detectors (MKIDs) for multispectral, single photon counting (time + energy of photons)?

This excellent answer to What would “the next GAIA”-like instrument be like? Could it simply be a 3 to 5x scaled-up version of the same beautiful system? is worth a thorough read-through, but it and ...
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3 votes
1 answer
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Why could I so easily see and photograph such a bright totally eclipsed Moon from a bright city road? (May 26, 2021 total lunar eclipse)

Due to scheduling and geometry I could only snap last night's lunar eclipse with an older model cell phone on a pedestrian overpass of a brightly lit city street, but surprisingly the Moon was quite ...
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1 vote
0 answers
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Not able to get Perfect Focus with DSLR and Newtonian

When using DSLR with Newtonian (130mm/1000mm), I am not able to get perfect focus. However, when I use an eyepiece, I am able to get crystal clear views. So, I think collimation is okay. The focusing ...
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3 votes
1 answer
285 views

How to reduce magnification and increase FOV of a camera attached to a telescope?

I am a beginner in astronomy. I have a Maksutov telescope (90mm/1250mm). Generally I do observation with a 25mm wide angle eyepiece, but sometimes due to light pollution I can't see many stars. So I ...
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3 votes
1 answer
536 views

What is this pale blue dot in a daytime photo of a Sun halo? [duplicate]

This photo of the sun behind a cloud was taken on the south coast of England in early May 2021 using an iPhone 11. A halo is visible which I think is the 22-degree halo. However, the photo also shows ...
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3 votes
1 answer
140 views

spider image in Samuel Oschin Schmidt Telescope DSS imagery

I was puzzled by image artifacts that appear in DSS-2 (blue) survey. These images were taken by the Samuel Oschin Schmidt Telescope on photographic plates and later digitized. They are also available ...
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2 votes
1 answer
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Streaks on a stacked star field

Stacking by Sequator 100 dng photos of night sky taken with a smartphone resulted in a (beautiful, I would say) populated star field where undesired arc streaks are seen all over the field. It is like ...
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6 votes
2 answers
105 views

Did Cassini return a photo of Saturn's rings shown from closer to Saturn?

A quote from a book, Perelandra by C.S. Lewis: "no eye looked up from beneath on the Ring of Lurga"; now Lurga is Saturn, and no human eye has been to Saturn, let alone at a lower altitude ...
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2 votes
3 answers
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How to determine when Sun/Moon is aligned to two location on Earth's surface?

I would like to make a photo to Moon/Sun when it is very low on horizon, so if I make the shot far away from an object on Earth surface, it appears as big as the Sun. But how can I calculate the right ...
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6 votes
0 answers
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Black spot in Mars' sky

There is a sequence of three raw images by Mars Curiosity Rover taken during Sol 3066 (22/03/2022, roughly) that show the same features of Mars' landscape and sky. They are separated by 38 seconds' ...
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4 votes
2 answers
106 views

How are image credits expressed in Astronomy presentations?

Sorry if this is a stupid question. I'm preparing an astronomy presentation, and I want to make sure I give credits where credits are due. But I see credits appear in different formats, for example: ...
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