I understand that increasing the distance from the telecompressor to the CCD
will do two things, increase the compression and decrease the fully illuminated
circle.
The fully illuminated circle for my TV .8x reducer should be about 48mm (61mm x .8 = 48mm).
The distance from the reducer to the CCD Chip is designed for 56mm +-2mm. The total length of the reducer from top to the CCD chip is 84mm. The focal length is not stated by Televue, but I think it would be 420mm and total required length is 105mm if you figure, 84 devided by 105 = .8, but I am not sure this math is correct.
It would seem that if I extend the distance to the CCD by 20mm, it would increase the compression to about .7x and reduce the illuminated circle to 42.7mm.
Does this seem about right?
I am thinking about how to mount the OAG with the reducer and if I could add a 20mm spacer, it might be possible to use as little as 10mm too, between the OAG and the filter wheel, I could manage everything as far as space and fit of the guide camera, where I need a little more space to allow the camera to fully extend the prism stem into the light path.
Do you think this would be possible or a good idea? Is my math anywhere near correct?
will do two things, increase the compression and decrease the fully illuminated
circle.
The fully illuminated circle for my TV .8x reducer should be about 48mm (61mm x .8 = 48mm).
The distance from the reducer to the CCD Chip is designed for 56mm +-2mm. The total length of the reducer from top to the CCD chip is 84mm. The focal length is not stated by Televue, but I think it would be 420mm and total required length is 105mm if you figure, 84 devided by 105 = .8, but I am not sure this math is correct.
It would seem that if I extend the distance to the CCD by 20mm, it would increase the compression to about .7x and reduce the illuminated circle to 42.7mm.
Does this seem about right?
I am thinking about how to mount the OAG with the reducer and if I could add a 20mm spacer, it might be possible to use as little as 10mm too, between the OAG and the filter wheel, I could manage everything as far as space and fit of the guide camera, where I need a little more space to allow the camera to fully extend the prism stem into the light path.
Do you think this would be possible or a good idea? Is my math anywhere near correct?
[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue
Amateur Imager
