I bought my first SLR camera 4 months ago. I love it, however there are few design issues that i have problems with.
The first problem i had is to mount it's lens. I was so excited to try it. Without reading its manuel, I decided to mount the lens intuitively. Toke off the lens cap, attached the lens to the camera body, and clockwise twist and.. it didn't work. It toke me an hour of trial and error till i figured it out which might damage the camera if i tried in a harsh or wrong way. Interestingly enough. that i can now mount any lens even for a different brand of cameras than mine. There are few standard mounting cues and techniques that most of the SLR cameras share and are obvious for a photographer. What I conclude is that before buying my SLR camera, i was in a point and shoot level and my background was not enough for a professional transition. Also, the believe that a professional camera should be fully intuitive and computerized that it will be easier for a computer geek like me, which is not true.
The second problem i had is the lens cap. The design of the lens have no option to keep the cap attached to the lens when it's in use. Instead, every time i have to use my camera, i should de-attache the cap and keep it somewhere else and risking losing it which might lead to damaging the lens itself with over exposure of dust, light and temperature changes. Some lenses have thread that is attach the cap with the lens when is use.
The third problem is with the design of the lens itself. The first advice i get from most manuels, websites, and professional photographer is to buy a filter to protect the lens. The filter is so cheap, that makes me wonder when it's not included in the design itself if the lens. specially that if i mounted a filter, i will not be able to add more lenses to the main lens.
The Fourth issue is with the design of the speaker outlet. It is so close to where i put my thumb. Because its the only finger in the back of the camera and the rest hold the camera from it's side, it is always pressing on the camera so hard that it sweets a lot. The design of the camera body is os great at that area that they make is a little bet harsh and not soft that my thumb doesn't slide when it sweats. The problem is that in a sunny hot day, the sweat get closer to the speaker small holes and I am always tension that it might get inside and damage the speakers at least.