NGC752 Open Cluster
Just a simple open cluster to check the fine-tuning of the spacing between the focal-reducer/field-flattener and the camera sensor.

Scope/Mount: StellarVue SV70T Refractor with SFFR-70APO Focal-reducer/Field-flattener, Celestron CI-700 Mount
Camera: ZWO ASI1600MMC monochrome with ZWO LRGB filters
Guiding: QHY5L-IIM through Orion Thin OAG, PHD guiding software
Exposure: LRGB: each channel (6) 150 sec @ gain=80
Software: Nebulosity, PhotoShop CS2
Comment: 11-03-2018, Tierra del Sol, CA, hazy clouds.