This is a first light for my new equipment, Tokina AT-X 300mm f2.8 manual focus lens.
North America and Pelican nebula shooted @ f2.8 with Baader 7nm H-alpha filter.
I will shoot later S-II and O-III channels to this target (those two filters are new as well)
to create a false color narrowband image.
Even full open, this lens is very sharp and large diameter (112mm) combined to a
fast optics (f2.8) collects photons fast. Exposure time to this relatively deep image was
only 5 x 900s = 1h and 15min.
This fast lens has a very narrow critical focus zone, about 17microns. (17/1000mm !)
I updated my homemade focusing system for this lens to use it with FocusMax software.
Camera: QHY8 (Red pixels only)
Guiding: Lodestar guider and PHD-guiding with LX200 GPS 12"
Exposures: 5 x 900s with Baader 7nm H-alpha filter
Lens: Tokina AT-x 300mm @ f2.8
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NO STARS
NO STARS
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Here is a same image but all stars are removed.
This way more details are visible in nebula area
This way more details are visible in nebula area
and total amount of nebulosity is revealed.
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