The trick is to press the lens right up against the glass

ISO sensitivity, tripods, noise and picture quality
The trick is to press the lens right up against the glass

When you take pictures through glass, for example pictures of fish at an aquarium, one thing you should be aware of is the light reflecting on the glass. Indoor lights or lights from the surrounding aquatic tanks are often reflected in the glass, and if you take pictures normally, the fish do not appear clearly. There are also times when the camera itself is reflected in the glass and shows up in the picture. You can take great-looking pictures and prevent all of these unwanted reflections by pressing the camera lens right up against the glass when you take your pictures. You yourself may also be reflected in the glass and appear in the picture if you are wearing bright-colored clothing. You can avoid this by wearing darker colors. You can use this technique not only in aquariums, but also when you take pictures of night scenes from building observation decks. The key to taking aquarium or night scene pictures is to press the lens right up against the glass.

   
 
 Reflection of the photographer is
 visible on the aquarium glass.		  Picture taken with the camera lens
 pressed against the aquarium glass.
ISO sensitivity, tripods, noise and picture quality

There are two methods to take pictures of night scenes: You can either use a tripod to prevent camera movement and use slow shutter speeds, or, set the ISO sensitivity higher so that the shutter speed will not be too slow. However, setting the ISO sensitivity too high increases image noise, resulting in a grainier picture. Even if you use a low ISO sensitivity setting, the image noise may still become noticeable in the picture if you use slow shutter speeds. You might think that pictures of night scenes tend to contain plenty of image noise, however, it is possible to prevent this problem by taking your pictures before it gets completely dark. If you take pictures when there is still some light remaining, the dim light ensures that the shutter speed is not too slow, and there is no need to increase sensitivity. However, be sure to use a tripod. Even though there is still some light, the shutter speed is not fast enough to prevent blurring when you take pictures holding the camera in your hands.