Posted 08 February 2013 - 01:23 AM
When LNtech300 is set in E.Lens mode, AGC must be set to OFF. If set to any other value, the E.Lens value is no longer correct. I.e., the brain overrides you.
E.g., Low, Med, High, etc. are all relative terms, and different brand/models pick their own numbers. Matt had probed the I2C setting on Ln300's A/D AFE to know the actual gain setting. (OFF is not zero but few dB gain, fixed.)
For Samsung SDC435, I don't remember.
Anyway, 1024x gives you an honest double amount time to collect double amount of photons for a better S (in S/N) to begin with. While Gain is analog signal amplification (which amplifies CCD noise and adds amplifier noise from itself as well).
If you are from a classic astroimager background, I'd guess you (most of them) will pick long exposure (unless bad tracking, bad seeing, bad light pollution) but also have to offset that with longer exposure == more thermal noise from sensor internally generated heat.
There is no perfect solution. BTW, SDC435 is using fine reso CCD, while LNtech300 is using the super-fine reso CCD. I.e., less pixel area to capture photon flux.
Also do not forget both do in-camera DSP post-processing.
If you ask me for my personal $0.02 view, I'd vote for SDC435 just for myself being classic.
If money is tight, go with LN300.