I just received, today, an ordered used Tamron Adaptall-2 Model 55B SP 500mm f8 mirror lens and this is one of my test shots mounted to my Pentax Q camera. This Mourning Dove, Zenaida macroura, was perched on a tree branch in the backyard, perhaps 75-100 feet away. I was struggling with the hardships of imaging from my makeshift blind, my office. My camera and lens were attached to my tripod and pointed out my opened office window while I sat patiently on my comfy office chair. For this image, I used my old manual focus Tamron Adaptall-2 Model 55B SP 500mm f8 Telephoto Mirror Lens with an attached generic Pentax K bayonet mount, mounted to my original model Pentax Q Camera via an inexpensive Chinese-made K to Q adapter, all mounted to my 1970s vintage Slik heavy-duty aluminum tripod, manually focused, ISO 400, f8, 1/100 sec., AV Mode, with available ambient light. I operated the shutter release via a hand held Infrared remote. This lens was functioning as a 2800mm f8 Telephoto Lens due to the Q's 5.6X Crop Factor. This is a 12.4 mp full resolution Large JPEG and is Straight Out Of Camera (SOOC) and is without any post-processing, editing, adjusting, cropping, or re-sizing.