|35mm Film||Lens||4mm CCD||Rel.
2x & 3x Barlow
The magnifications listed have been measured from the images above and are
relative to the 50mm "standard" lens.
The CCD measures 4.8mm x 3.6mm compared to the 36mm x 24mm of the film frame - this gives the CCD frame an apparent extra magnification of 7.5x compared to the film. As the film can record finer detail than our CCD, its advantage is reduced.
The lenses used were: 28-70mm zoom, 50mm fixed, 135mm
fixed, 75-300mm zoom (only works between 180-300mm)
The telescope is 1000mm long, 200mm diameter (f 5).
The house in the film frames was about 150m from the telescope. The map was
1.67m from the CCD.
The two "telescope" CCD images have been simulated - it is not possible to focus on such a close object.
The intensity settings on the CCD were not changed to demonstrate the relative brightnesses of the lenses rather than to optimise image quality.