The OM-1n is an all-mechanical SLR. It has a very large viewfinder with interchangeable screens but a fixed prism. It also has a through-the-lens exposure meter controlling a needle visible in the viewfinder. It has a very compact body. The OM-1n is the same as the OM-1MD with a redesigned film advance lever, a flash ready/sufficient flash LED in the viewfinder, and automatic X-sync regardless of the position of the FP/X switch, when it is used with a T-series flash unit mounted on Flash Shoe 4.
The Questar Field Model is the ultimate spotting scope. For situations requiring long focal lengths, no other scope matches the Field Model's resolution and image contrast. As a telephoto lens, the Field Model is comparable in size to a 250mm f/2.8 lens, and weighs less than 3 pounds. It has all the controls of the Standard 3.5, giving the observer 3 powers per eyepiece and giving the photographer a separate selectable port for the camera attachment. The Field Model is designed expressly for terrestrial observation and photography, yet when mounted on a pan head it can also be used successfully for sky observation. It has the same optic and built in
functional control elements as the astronomical units with the exception of the astronomical mount and the moon and star chart barrel covers. The Field Model has the rapid focus option that was developed primarily for the convenience of photographers.
This is a USED kit, there are signs of use and age on both the camera and telescope. The glass is in great shape, there are no scratches that could be seen. The aperture on the OM-1n, sounds accurate, we have no tools to test and confirm.