Can I build a cheap telescope or attachment for my DSLR to photograph the Moon and planets?

Asked 11/29/2015

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I want a low-cost way to use my DSLR for basic astrophotography, especially the Moon and possibly planets. Is it practical to build a simple telescope from convex/concave lenses and attach it to a DSLR, or is it better to adapt an existing telescope or binoculars? What kind of mounting or tracking setup is needed, and what general camera settings matter for space photos?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

10y ago

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You should know that the big astronomical observatories sport giant telescopes that are actually telephoto lenses for specialized cameras. That being said, you can mount most any camera to binocular or telescope. Mounts and clamps are available on the web that clamp most any camera (with its exiting lens) to the eyepiece of common telescopes. This position is called “afocal”. You can do this by placing binoculars on a tripod or ledge and hand-hold the camera so the camera lens just kisses the eyepiece lens. Such a lash-up is likely the best way for you to get space pictures.

Most “space pictures” are shots of the moon or planets taken with super big telescopes either in space orbit or placed atop mountain locations. You can make space pictures but you will never achieve what the big boys get.

More advanced astrophotography use special adapters to mount your camera to commonly available telescopes. Two methods A. the camera lens is removed as is the telescope eyepiece, these are replaced by the camera. This is called “prime” position. The camera utilized the telescope’s objective lens as its telephoto optics. B. The camera telescope adapter contains the telescope eyepiece. The camera with lens removed is positioned so the image formed by the eyepiece is projected on film or sensor.

In astrophotography , most objects are too dim to photograph unless the exposure is minutes or hours long. To accomplish, the camera/telescope must be placed on a motorized mount that tracks the object, keeping it centered during the extended exposure.

Also, you should know that high magnifications are not achieved easily. To achieve you need large diameter objective lenses. As a rule of thumb, 35X power per inch diameter of objective lens. You can get lots more magnification but it will be “empty” meaning the image is magnified but resolving power is low. In other words, a 100x magnification might image a distant newspaper but if the magnification is empty, you can’t read the words.

Fine astronomical photography can be accomplished with simple and inexpensive equipment. You just must accept that the learning curve is a bit steep.

Originally by user44949. Source · Licensed CC BY-SA 4.0

user44949

10y ago

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Generated from our catalog & community — verify before relying on it.

Yes, people can build telescopes, but making good optics and a precise camera adapter yourself is usually not the cheapest or easiest path. For most beginners, a practical low-cost option is to use an existing telescope or even binoculars with your DSLR.

Common approaches:

  • Afocal: aim the camera through the telescope/binocular eyepiece using a clamp or adapter.
  • Direct attachment: connect the camera body to a telescope with a suitable adapter tube/ring.

The bigger challenge is often not the optics but the mount. For Moon/planet shots, stability matters a lot, and for longer exposures you typically need tracking. A simple, inexpensive improvement is a barn door tracker; for heavier setups, an equatorial mount is preferred.

A few realities:

  • Excellent “space” images usually come from very large telescopes and ideal locations.
  • The Moon is the easiest target.
  • Planets require much more magnification, steadiness, and often tracking.

There is no single aperture/exposure/ISO setting that works for all space photos. Settings depend on the target, focal length, tracking, and sky conditions. In general, use the lowest ISO that still gives a good exposure, keep the setup very stable, and expect to experiment.

UniqueBot

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10y ago

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