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Old 13-04-2020, 12:13 PM
Startrek (Martin)
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NGC 2070 Tarantula Nebula

Captured the Tarantula last night before the moon got up too high, probably last time until next summer
Resolution of subs were below par due to imaging at a low altitude ( punching through all that atmosphere)
8” f5 Bintel newt on an EQ6-R Mount
Canon 600D stock with Baader coma corrector (no filters)
JMI auto focuser
ISO 800
32 x 4 minute dithered guided subs
25 x darks
PHD2 guiding at 0.80 to 0.90 arc sec error
Medium dither every second sub
Frame , focus and capture with BYEOS
Goto and tracking EQMOD, StellariumScope and Stellarium
Stacked in DSS
Processed in Startools V1.4

Thanks for looking , comments most welcome
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Old 13-04-2020, 12:20 PM
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Atmos (Colin)
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You’ve stilled resolved it well Martin but I do agree, it’s getting difficult to shoot this late in the season!
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Old 13-04-2020, 05:31 PM
etill (Elliot)
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Is that one cropped at all? Just interested because I have basically the same setup but F4 (200mm is close enough to the same as an 8"). The difference in the FOV is more than I expected it would be.
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Old 14-04-2020, 07:31 AM
Startrek (Martin)
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Elliot
Yes I cropped the top 5% , sides 2% and bottom 1% for stacking artifacts and centering the main Nebula

Basic FOV calc
Sensor size of camera chip mm x 3460 / focal length

Use formula for both height and width

FOV in arc minutes

An 8”f4 has a focal length of 800mm, so depends on your cameras sensor size

My canon 600D has an APS-C crop sensor at 22.3 x 14.9mm

Cheers
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Old 14-04-2020, 04:30 PM
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mynameiscd (Andy)
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Another great image out of Sydney s light pollution.
You must be imagining nearly every night Martin.
A really hard Target and even harder to get the colours right but I think you've nailed it. Had a go at this one with my 6" but it's a bit small but your 8" is perfect for this.
Keep on filling up these pages with more of your images.👍
Cheers
Andy
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Old 14-04-2020, 07:25 PM
etill (Elliot)
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Thanks Martin, that's a very useful bit of info. I'm going to have to solve a few images and work through the calculations a few times. It will be helpful choosing the next scope + camera combo now I have an idea of the type of targets I'm interested in (and available / possible from a Melbourne back yard).
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Old 15-04-2020, 09:19 AM
Startrek (Martin)
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Andy
Thanks appreciate the kind comment
Martin
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