The much sort after ASA 12n F.3.6, it's not manufactured any more and is a peach of a focal length with superb optics.
Pier-4 is a very fast F/3.6 when used with a CMOS sensor the longest exposure needed for this pier is 300 seconds
CMOS Camera
The ZWO ASI-2400MC Pro Colour 35mm CMOS is a superb camera with the perfect pixel size to suit this scope
Combine this with the IDAS D3 filter for RGB and Askar Colour magic D Ha/O3 & S2/o3 filters for narrowband, and it's a winning combination
Sony IMX410
Back illuminated CMOS Sensor 36x24mm 6072x4042pixels 5.94µm
Bayer Matrix Parameters
RGGB
1.91° x 1.27°
1.13 "/px
1087mm Focal Length
F/3.6
30º Imaging Horizon Limits
Camera Position Angle: 268°
Recommended sub lengths
Filter
Bright
Dim
OSC
30-60s
60-20s
RGB
30-60s
60-180s
Ha/03
60-120s
120-300s
S2/03
60-120s
120-300s
Calibration Files
The following calibration files are available as standard with this system. Other darks are available upon request.
10s Darks
20s Darks
30s Darks
45s Darks
60s Darks
90s Darks
120s Darks
180s Darks
240s Darks
300s Darks
Bias Frames
Flat Frames
Filter Charactristics
Although Pier-4 has a OSC Camera we have also added some modern Dual/Triband fiters designed for narrowband imaging etc
RGB filter we used the - IDAS LPS-D3 Filter -
The IDAS LPS-D3 filters enhance the contrast of astronomical emission nebulae against a sky with both man-made and natural* sky glow sources, yet preserve the colour balance of broadband objects such as galaxies. As with other IDAS interference filters, the bandpasses are designed to accommodate the steep ray angles of fast optical systems.
Narrowband filters we used the - Askar Colourmagic HA/OIII&SII/OIII 6nm
The filter enables the capture of the three main emission nebulae bands using two different filters, whilst suppressing unwanted light pollution. It enables you to capture cleaner data and reduces the post-processing efforts to isolate faint details from the background light pollution.
These use of these filters will allow you to HOS palette & enhance your standard broadband images with increased H2 regions etc - What's not to like with that :)
Bayer matrix
When you receive your data, at first glance it may appear green, this is normal because One shot colour cameras have a bayer matrix over the sensor, this particular sensor has a RGGB bayer matrix and you will need to de-bayer it as part of your calibration and stacking process in your chosen software.