Photographing through glass inside

When photographing an object behind glass avoid using a digital camera flash. Instead, shoot the object from the side that has the most lighting. Be sure to position yourself in a way so as not to block the light.

Place the camera lens against the glass. Ideally, the lens should be perpendicular to the glass.

When lighting is extremely low, to help prevent blur due to camera shake, use a tripod or increase the camera sensitivity (ISO). Or do both.

If you have no option but to use a flash, step back as far as you can from the glass when using it. If your camera has a setting to control flash output, decrease it.

Photographing through glass outside

When shooting through glass outside in bright light, use a polarizer filter. It will reduce reflections and you shouldn’t have to hold the lens against the glass.

Watch the angle you’re shooting from to keep reflections, including your own, at a minimum.