Check the thread, not only the diameter.
These are mounted 2-inch filters with an M48 x 0.75 thread.
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Five filter choices
One 2-inch M48 format. Two different imaging jobs.
2 inchmounted format
A shared mechanical fit.
Every listed variant uses a round 2-inch mount with an M48 x 0.75 thread.
7 nmnarrowband width
H-alpha, OIII and SII isolate emission lines.
Choose 656 nm H-alpha, 500 nm OIII or 672 nm SII for narrowband imaging.
>95%average transmission
Blue and Green cover broadband colour channels.
The IR-blocked Blue and Green filters cover 410-500 nm and 500-550 nm respectively.
Choose a filter
Match the passband to the channel you need.
Filter
Type
Passband
H-alpha
Narrowband
656 nm, 7 nm FWHM
OIII
Narrowband
500 nm, 7 nm FWHM
SII
Narrowband
672 nm, 7 nm FWHM
Blue
Bandpass, IR-blocked
410-500 nm
Green
Bandpass, IR-blocked
500-550 nm
Good to know.
Check the thread, not only the diameter.
These are mounted 2-inch filters with an M48 x 0.75 thread.
The optical finish is shared.
All five variants use 1/4-wavefront polish and multilayer anti-reflection coatings.
Blue and Green are not 7 nm filters.
They are broadband colour filters, while H-alpha, OIII and SII are the narrowband choices.
Technical
Specifications.
Format
2-inch mounted, round
Thread
M48 x 0.75
Polish and coating
1/4 wavefront; multilayer anti-reflection
Thickness
5 mm body + 2.5 mm thread; 2 mm glass
Variants
H-alpha
>80% at 656 nm; 7 nm FWHM
OIII
>80% at 500 nm; 7 nm FWHM
SII
>80% at 672 nm; 7 nm FWHM
Blue
>95%; 410-500 nm; IR-blocked
Green
>95%; 500-550 nm; IR-blocked
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