IC405
Technical information
- Telescope/Lens
- Samyang 135mm f/2 ED UMC
- Camera
- Canon EOS 60Da
- Mount
- iOptron SkyTracker Pro
- Accessories
- SVBONY CLS Filter
- Software
- Siril, StarNet, Adobe Photoshop
- Location
- Perm, Russia
Light pollution
Green, Bortle 4 zone
- Date taken
Exposure
- 66 × 120″ · ISO/Gain: 640 · f/2.8 ·
- 15 × 60″ · ISO/Gain: 640 · f/2.8 ·
Total exposure: 2 h 27 m
Comments
I recently tried the Samyang 85mm, and at f/2.8, the red channel is noticeably out of focus compared to the green and blue.
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The 135mm also has an issue with red halos, which is especially noticeable when using a CLS filter. I've almost developed a strategy of focusing on the red channel (because hydrogen nebulae are the most accessible) and then combining it with the other channels.
At one point, I considered the 85mm for astrophotography, but I realized it's really not suited for that, it seems.
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