QHY 600M-PH SBFL - Cooled BSI Monochrome Camera - Full Frame Sensor, Photographic with Shorter Back Focus Version - 110064 Adapters - M54 25" insertion barrel if you

25" insertion barrel if you want to do prime focus photography using "0" extra magnification

so measure carefully & look for "low-profile" filters

especially near the edges of the map

About the Celestron Regal M2 100ED Zoom Spotting Scope

QHY 600M-PH SBFL - Cooled BSI Monochrome Camera - Full Frame Sensor, Photographic with Shorter Back Focus Version - 110064 Adapters - M54 25" insertion barrel if youSBFL (Short back focal length version) models are specially designed for DSLR lens users or those who have a special requirement for short back focal length. This version has a special front section which has 14. 5mm B. F. L only (The B. F. L consumed equals 12. 5mm when connecting a QHYCFW. A model with the SBFL suffix can easily use a Canon Nikon lens (with optional lens adapter) even with a filter wheel installed. The QHY 600M SBFL at a Glance: