Newbie question on atsrophotography

  • Context: High School 
  • Thread starter Thread starter Holocene
  • Start date Start date
Click For Summary
SUMMARY

Exposure time significantly affects astrophotography images, particularly when capturing stars in the night sky. The sensitivity of the film, indicated by the ISO setting, and the lens's focal length also play crucial roles. Longer exposure times reveal more stars, but exposures exceeding one minute result in star trails due to Earth's rotation. For digital cameras, it is essential to open the aperture fully, focus at infinity, and experiment with exposure times ranging from several seconds to a few minutes, unless a clock drive is used to prevent star trails.

PREREQUISITES
  • Understanding of exposure time in photography
  • Knowledge of ISO settings and their impact on image sensitivity
  • Familiarity with lens focal lengths and their effects on astrophotography
  • Basic principles of digital camera settings, including aperture and focus
NEXT STEPS
  • Research techniques for capturing star trails versus pinpoint stars
  • Explore the use of clock drives in astrophotography
  • Learn about optimal ISO settings for night sky photography
  • Investigate different lens types suitable for astrophotography
USEFUL FOR

Amateur photographers, astrophotography enthusiasts, and anyone interested in capturing celestial images using basic camera equipment.

Holocene
Messages
237
Reaction score
0
What effect does exposure time have on images?

Say I just wanted to take a picture of some stars in the night sky, just with a cammera, no other optics...

Is it the exposure time that will show the stars?
 
Astronomy news on Phys.org
The exposure depends on the sensitivity of the film (ISO setting) and the focal length of the lens. The longer the exposure the more stars will be visible, but if it is longer than around a minute the stars will be blurred into lines as the Earth rotates.
The easiest way is to try different settings and see.

It's a little more difficult with a digital camera.
 
Open the aperture all the way, focus at infinity, and take exposures of several seconds up to a few minutes, depending upon your subject. Beyond that you'll need some kind of clock drive, unless you desire star trails in your images.

- Warren
 

Similar threads

High School Optimizing Exposure Times: Balancing Efficiency and Image Quality
  • · Replies 41 ·
2
Replies
41
Views
8K
Graduate Diffraction Effects and Artifacts in Telescopes like the JWST
  • · Replies 125 ·
5
Replies
125
Views
8K
Stargazing Is it nebulosity or an artefact?
  • · Replies 28 ·
Replies
28
Views
4K
High School Star like object travels in a zigzagging pattern relative to other stars
  • · Replies 49 ·
2
Replies
49
Views
12K
Undergrad Lines of stars that we see in the sky
  • · Replies 26 ·
Replies
26
Views
6K
High School How bright is the Sun compared to the sky?
  • · Replies 17 ·
Replies
17
Views
4K
High School Question: Orbital mechanics of a binary star system
  • · Replies 5 ·
Replies
5
Views
3K
Stargazing Telescope Guiding Techniques: Improving Exposure Times through Auto Guiding
  • · Replies 51 ·
2
Replies
51
Views
6K
High School Who was the first person to recognize the stars as very distant suns?
  • · Replies 12 ·
Replies
12
Views
4K
High School Night Sky of Alpha Centauri: Sol as a Bright Star
  • · Replies 15 ·
Replies
15
Views
4K