The Narrowband Sub Length Problem Nobody Talks About. Use My Sub Calculator to Fix It! @deepskydetail
The Narrowband Sub Length Problem Nobody Talks About. Use My Sub Calculator to Fix It!  @deepskydetail
Uploaded April 2026 | Updated September 2026, 12 hours ago
I made a sub-frame calculator for #astrophotography. It's available free online. as a Windows .exe or a SiriL python script. I updated to be better with OSC cameras and narrowband images.

online: deepskydetail.shinyapps.io/Sub_Length_Calc_DSD
Windows: buymeacoffee.com/deepskydetail/e/524780
Siril: buymeacoffee.com/deepskydetail/e/524785
GitHub: github.com/deepskydetail/DSD_SubCalc

Become a buymeacoffee member to help choose which products I review: buymeacoffee.com/deepskydetail

Affiliate Links:
High Point Scientific: highpointscientific.com/?rfsn=8751569.cc9d94
Agena Astro: agenaastro.com/?rfsn=7802039.3f4caf

Skywatcher HEQ5 Mount amzn.to/3NVrVQi
Skywatcher 80mm F7.5 Doublet amzn.to/47mbfZi
ZWO EFW mini filter wheel amzn.to/48OxhoN
Optolong LRGB Filter Set (1.25") amzn.to/47r23Tw
Orion 0.8x Reducer amzn.to/47s64a4
USB RJ45 Cable for Controlling Mount amzn.to/4aPlIzu
Raspberry Pi to control mount amzn.to/48mTBWH
R Pi case with touch screen amzn.to/3HvdNKl
ZWO Autofocuser amzn.to/3Skg0hX

ZWO 294MM Pro Camera: bit.ly/3tZmjOo
HEQ5 Mount: bit.ly/3O7VQVz (mine is Orion Sirius, which is equivalent)
ZWO Filter Wheel: bit.ly/3Soo5lw
Optolong Filters (LRGB, SII, Ha, OIII): bit.ly/3SlEPtJ (the Ha and OIII narrowband filters are better than what I have)
Skywatcher Evostar 80mm: bit.ly/4bfVjev (equivalent lens)
USB RJ45 Cable: bit.ly/48FRj50 (connects mount to laptop directly; mine is a different brand, but this should do)
ZWO Autofocuser: bit.ly/425XUDB
0.8x Reducer: bit.ly/3tQlbg7 (mine is Orion, but this should be equivalent)

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The Narrowband Sub Length Problem Nobody Talks About. Use My Sub Calculator to Fix It!

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