I'm very much an amateur, but for large collection photo, I would use a tripod, longer exposure (up to several seconds), use the timer function if you don't have a remote (avoids camera shake when pressing the shutter button), use a small aperture (higher F number), and the lowest ISO possible. Using a low F-stop number will allow more light, but causes lack of sharpness. High ISO's cause "noise", that would potentially be the "blurryness" you see when zoomed in. Also, if your lens has Image stabilization, turn it off when shooting on the tripod. There are in general 3 technical parts to a photo, How much light the lens let's in (Aperture or F-Stop), How long the light is let in (Exposure or shutter speed), and how the sensitive the "film" is to the light (ISO). For the sharpest photo's you want a very still camera, high F-stop number (less light), a very low ISO (less sensitive), and then adjust the exposure to be long enough to make the picture turn out the correct brightness. Again, I am very much an amateur and just learning all this myself, but there are many good websites and books out there.