These days it is mostly "hit" on both the C14HD and the standard C14.? If you only care about looking at?or imaging the center of the field, then the standard C14 will be fine.? But if you want a nice flat field with pin point stars to the edge or even just a clear planetary image if it drifts across the field of view, then you want the EdgeHD.? Very few people are dissatisfied with the EdgeHD.? In either case, powered ventilation is easily added since both of the current versions have the same rear cell with passive vents.
Ed Thomas
Deep Space Products
