Han Kleijn's astronomy experiences:


These pages contain personal experiences with the ETX, LX10 and LX200  telescopes, astronomical use of the Webcam PC video camera and a CCD camera, an astronomical exposure spreadsheet, an describtion how to make the ETX (old model 1997) drive speed adjustable and the circuit of the LX10 handcontroller.

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You can send me an email:  han kleijn's email address

Hallo I' m a Dutchman living in Germany. I was always interested in astronomy , but became first active in december 1996.

This home page is kept very simple. Here I show some of my results with an ordinary camera and with the ETX telescope.

Hale bopp with a normal camera.

This one of Hale-Bopp was made in april 97. To compensate to movement, I used an ordinary timer running on 230 VAC. The results where very good. The timer platform is on the left bottom corner of the picture.

Working with the simple timer platform resulted in some nice picture and a lot of fun. Later I bought the ETX and made some nice pictures with the same camera on top of the ETX. The ETX was an easier platform than the timer and made it easier to point to a specific part of the sky.

ETX telescope

Here are some results with a parallel port PC video camera:

Here are some results of my camera riding on top of the ETX, LX10 or LX200:

Later I made some pictures of the moon using eye pc projection. On the next link you can see some of the results:

I started with making astronomical pictures in the beginning of 1997. Soon the question came how long exposure was required to get something on film. This is not so easy for astronomical objects.There is no camera exposure meter which can cope with the very very very small amount of light received from the planets and deepsky objects. Exposure time could reach hours. For this a mathematical calculation should be made, using the brightness factor from almanacs or other sources.

To streamline this, I made a Excel 4.0 spreadsheet which calculates the required exposure time for all the planets, Sun, Moon, stars and Deepsky objects. The latest version 2.01 from June 1998 does also contain Sun eclipse values:

My new HNSKY planetarium program is available. Have a try. It is free with 8394 deepsky objects and all Tycho stars till magnitude 12.

With eyepc projection it is possible to magnify the planets enough to get something on film. These are some of my results:

Here are some guidlines how I succesfully make pictures with the ETX:

The speed of the ETX drive is fixed and it not always running with the right speed. Here is a description how to make the speed adjustable:

In October 1997 I bought the LX10 telescope. Here is my diary describing of experiences: