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Portable Telescope.
Portable Telescope.  
QUESTION: Dear Deirdre

https://en.wikipedia.org/wiki/Telescope‎
http://www.starmastertelescopes.com/‎
http://www.optcorp.com/celestron-21035-travel-scope-70-portable-telescope.html
http://www.opticsplanet.com/celestron-travel-scope-70-portable-telescope-21035.h
http://www.squidoo.com/best-telescopes
http://www.infinityscopes.com/
http://www.youtube.com/watch?v=TCfzOr0XVx8

Are there range of Portable Telescopes which can be used for recording and storing sky objects images digitally similar to photo images snapshots captured by digital cameras ?.

i.e. The Astronomer, Hobbyist etc can view as well as store the sky objects digitally as images in telescopes memory card.

Later on, those images captured and stored on the telescope memory card can be downloaded on a computer via USB port.   

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

ANSWER: Almost any telescoope can be used for astrophotography. There are adapters called T-rings or T adapters which allow the camera body to be mounted to the telescope. The selected telescope lens is placed in the adapter, and the adapter is mounted to the camera, and that entire assembly is placed where the telescope lens is mounted.

The person using the telescope will then look through the camera view-finder and the entire telescope then becomes the lens for the SLR.

This is the best solution for astrophotography because it permits any magnification that the telescope is capable of to be photographed, and the resolution is limited only by the resolution of a camera. Both telescopes and cameras can be expensive, and in this fashion, upgrading one doesn't require the upgrade of the other.

There are a number of telescopes and binoculars sold with built-in cameras, but, by far, in part because of the nature of astronomical telescopes, the cameras are separate. If you try to split the light from a telescope and send part of it to a camera, and part of it to an observer's lens, the light to both is diminished in each. The primary goal of an astronomical telescope is to gather as much light as possible and to focus it either on a camera or the observer's eye; that is the only way to view dim and distant objects.

The most common technology from telescope manufacturers today is a CCD, USB camera. You can find a number of examples here: http://protelescope.com/

---------- FOLLOW-UP ----------

QUESTION: Dear Deirdre

Thank you.

The USB Camera kit has to separately purchased from the Telescope portable instrument for astrophotography ?. i.e. Is it a Add-On with the Telescope instrument ?.

OR

Will it be part of the complete portable telescope package ?.


Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

ANSWER: Please look at the link I provided. There are a number of different packages available, some with the CCD camera, some without.

---------- FOLLOW-UP ----------

Portable Telescope
Portable Telescope  
QUESTION: Dear Deirdre

Thank you.

1. Is it also possible to design and manufacture a Portable Telescope where the camera digital electronics is embedded within the Telescope assembly and the images captured by telescope with click of buttons on the telescope assembly are stored in Telescope memory card ?. Later on, the stored images (sky objects) in the telescope memory card will be downloaded to the computer via the USB connector on the telescope assembly through a interface cable to the Personal computer ?.

i.e. Similar to a Digital camera functionality where the Telescope
optical - mechanical assembly is integrated with the Digital Camera electronics to become a optical-electro-mechanical system ?.


2. Do you feel the above design can also work for the portable
telescope i.e. integrated product ?. The above design could involve more complexity for manufacturing and subsequently the cost may rise for production ?.

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

Answer
This is the first question I addressed above. But to be more clear, a Digital SLR with a telephoto lens is the very thing you are talking about. But for astronomical purposes, which seems to be the more exact point, while it might be possible to integrate a camera into the telescope, it is impractical.

Firstly, the user of a telescope selects magnification by changing eyepieces. An integrated camera would need its own eyepieces to match those of the viewer, doubling the number of optical components, and requiring some sort of complex switching mechanism.
Secondly, having a camera AND an eyepiece, both active at once, would mean that for the same viewing capability of a given telescope, as opposed to a single purpose telescope, the optics would need more than double the surface area. Thus, in a Newtonian Reflector, to achieve the same viewing capability of a single-purpose telescope (meaning that an eyepiece OR a camera can be used) with a 4"diameter main mirror, a telescope that permitted both a camera AND a viewer lens at the same time would need at least a 6" mirror to give the viewer the same viewing capabilities.

Splitting the light to both a camera and an eyepiece involves sending half that light to each element, and there are losses in the mirror as well. It reduces by half, the useful light that can be presented to either the camera or the eyepiece. This is why telescopes used for both astrophotography and regular viewing use an adapter that fits over the eyepiece for capturing digital or film images.

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Deirdre Hebert

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I can answer most questions regarding electronic components, what they are and how to use them.

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I worked for a number of years in the electronic component testing industry, designing and building automated test equipment for the electronic manufacturing industry.

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