With changing times, here is the revised list:
1. LPF-2 removed and replaced with a modified filter [stock LPF-1 AS-IS]
2. LPF-2 removed and NOT replaced [stock LPF-1 AS-IS] (My recommendation...)
3. LPF-2 removed and replaced with clear glass [stock LPF-1 AS-IS]
Note: This is 'old' thinner clear glass and is getting somewhat obsolete in favor of the 'new' #5 below
4. Both, LPF-2 and LPF-1 removed (full spectrum) [external UV/IR block required]
5. Both, LPF-2 and LPF-1 removed (full spectrum) and replaced with clear glass [external UV/IR block required]
Note: This is 'new' thicker clear glass than #3; its optical thickness is equivalent to combined two removed filters
6. LPF-2 removed and replaced with a modified filter & stock LPF-1 removed [this is quite rare and unorthodoxy]
Note: All options, except #4 and #5, 'may not' require external UV/IR block; additional UV/IR block can be added for refractive optics (to prevent star bloating). Light pollution suppression is something that can be used with any mod type
Note: Narrowband (NB) filter can be used with any mod type; 'NO' #4 or #5 external UV/IR block required if using a NB filter
IMPORTANT: Not all sensor designs allow for all mod choices. Sometimes for example LPF-1 and LPF-2 may be bonded together; in such cases full-spectrum mod may be the only option!
To conclude, remember this...
"Essene of any astro mod is to get rid of stock LPF-2"
Edited by mmalik, 29 October 2015 - 01:32 AM.