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Robert,
Just for the record...Maurice Gavin (UK) was the first amateur to record the Redshift of 3C273 back in 1998. (See "Astronomical Spectroscopy for Amateurs", p 120)
The issue with recording faint objects is getting a good resolution combined with an acceptable SNR.
This usually demands large telescope apertures and fast f ratios combined with low resolution spectrscopes/ gratings.
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