My first SLR was a Praktica FX bought used in the early 1960s. I used it a few years before getting a Nikon F (quite a step up!). The waist level viewfinder was dim and rather inconvenient. The sports finder was clever, but framing was difficult for glasses wearers. The mirror blackout after shooting was distracting. Hinging the back would have made reloading easier. It needed only one repair that I could do myself. There must have been inexpensive and better used SLRs available at the time, but it helped me avoid more expensive mistakes when I upgraded.