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Dec 2004: Finally bought my Canon 300D DSLR lens kit via portable 1970 clock-drive. Cropped images via Canon 300D + EOS 33 28-90mm lens at full zoom [16mm clear aperture] give better resolution + going fainter ~mag11.1 than supplied 18-55mm zoom. Continued experiment with filters and large aperture lenses of 500, 135, 85 mm fl lens onto Canon 300D via EOS/M42 adapter.
2004 Dec 19/22/24/25/28/30 Jan 1/2/4/5/8/10/12/13/15/16: Canon 300D images of Comet Machholz through rising ever higher in Eridanus into Taurus then Perseus initially in bright moonlight. Comet spectrum shows greenish bias but mainly reflected sunlight in the full range of colours - M42 shows emission of Hb/OIII [blue] + Ha [red].
Improved spectra via a 300mm fl lens +
OG prism gives greater spectral resolution especially in stars like Algol
[b Per] which show the Canon CMOS sensor amazingly
records 10 hydrogen lines from Hb to 373.4nm
for Hl=lambda in near UV where the spectrum
become essentially colourless. Balmer lines converge at 364.5nm in
UV. Other 'solar' type stars record the dual H/K lines of CII in violet.
The important Ha in red at 656.3nm is well recorded [eg M42] but somewhat suppressed as noted on Internet NewsGroups.