Making photos with the ETX

The last 6 months, I have shot with the ETX about 10 films full. The results are slowly improving and I have learned following:

1) Deep SKY is not pratical with the ETX.


2) Making pictures of planets and moon is very
    good possible with the ETX.

3) Vibrations of the camera (mine) have a negative
    effect on most pictures.

My normal practise is that I:

   1) Cover the front lens of the ETX with my black rubber
       mouse pad.
   2) Open the shutter of the camera.
   3) Remove the cover of the ETX
   4) Wait the exposure time and then cover the ETX again.
   5) Close the camera shutter.

Exposure time should be kept short. The drive of the ETX is not intended for long time exposures and how shorter the exposure time is, how less the influence of fluctuations will be. However by manual covering and un-covering the ETX, fluctuations due to camera shutter are eliminated. Therefore the most succes I had with exposures between 0,3 and 5 seconds.

To get enough magnification and to increase the exposure time to 0,3 seconds or more (My arm is not faster) I use eyepc projection. For this, I use the standard #64 T adaptor of Meade as shown in fig 11 of the ETX manual. This adapter is intended for direct focus, but can also be abused for eyepc projection. For this, I just mount a standard oculair (preferably type ploessl) inside this adaptor. I do this by wrapping a paper tissue around the oculair, till it just fits inside the tube and stays there. Here is a sketch how it is done:


etx_eyep.gif

For the Moon, eyepc projection with a 17 or 12 mm oculair at 79 mm distance with a film of 50 , 100 or 200 asa is ideal. For Jupiter a 12 mm oculair and a 400 asa film. For Saturn a 12 or 9/7 mm oculair and 1600 /3200 asa film. Try to keep the exposure time at 0,5 till 1,0 seconds.

Thats all folks.