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iPhone & D850 DSLR imaging: Crab Nebula

Posted: 7 December 2020

Open: Sunday, 6 December 2020, 2016 MST
Temperature: 56°F
Session: 1567
Conditions: Mostly clear

12" f/8 LX600 w/StarLock
2" 24mm UWA eyepiece
2" 9mm 100° eyepiece
1.25" 15mm eyepiece
2" UHC, HA, OIII filters

iPhone 11 Pro Max

2020 MST: LX600 ON, StarLock OFF, High Precision OFF.

Viewed M1 (Crab Nebula), 102X, 271X, and 163X.

Mounted the iPhone 11 Pro Max on the 15mm eyepiece using the Levenhuk Smartphone Adapter.

2046 MST: StarLock ON.

This is an afocal 163X StarLock autoguided image of the Crab Nebula taken with the iPhone using the iOS app NightCap Camera (Long Exposure, Light Boost, ISO 12500, 1sec, 1 minute exposure, 1X lens).


Next, I mounted the D850 DSLR at prime focus using the Starizona Filter Slider System. I did a series of StarLock autoguided images of the Crab Nebula with no filter (ISO 6400, 30 seconds, White Balance 5000K), and then 10 minute exposures using the Explore Scientific 2" UHC filter, and the Optolong 2" HA and OIII filters. Here are those images.

30 seconds, no filter

10 minutes, UHC filter

10 minutes, HA filter

10 minutes, OIII filter

This image of the Crab Nebula is a stack of the UHC, HA, and OIII images with some additional post-processing.


It is interesting to compare the iPhone and D850 DSLR images.

2205 MST: StarLock OFF.

(A neighbor's greenhouse lights were on this night.)

Viewed M42 (Great Nebula in Orion), 102X. Then viewed NGC1977 (Running Man Nebula), 102X.

2221 MST: LX600 OFF.

Lastly, I took a Sky Quality reading and reported the result to Globe at Night.

Close: Sunday, 6 December 2020, 2236 MST
Temperature: 52°F
Session Length: 2h 20m
Conditions: Mostly clear, SQM 21.02

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