Pentax's DA Fisheye 10-17mm f/3.5-4.5 ED [IF]
lens can be ideal for giving a different take on your images. here are a few situations where this lens can give a different feel to your images:
Landscapes often require a wide-angle lens to enable you to make the most out of them, however taking this one step further and using a fisheye lens will enable you to create more uninhibited and dynamic images.
With distortion being a distinguishing characteristic of this lens, use this to your advantage and shoot images that feature buildings or trees that will look abstract. Moving away from your subject will cause distortion to increase, thus adding to the impression of expansiveness in the image.
Flowers that have large middles can be emphasised by using the 10-17mm fisheye lens. Increasing the distortion in this way will increase the flower's presence. Flowers that are very round are ideal for this technique.
When shooting the flowers, look for an angle that will add interest to the shot, for example looking up from below the flower (this is pretty easy with tall sunflowers) can give a bug's eye view of it.
Using the 10-17mm fisheye for portraits can produce some interesting and fun effects. If you shoot with a background containing many straight lines, distortion will be increased, creating an unusual feel in images taken indoors.
This lens allows the depth of the background to be emphasised, so you'll need to make sure your subject is centralized and connecting with the viewer in order to gain maximum impact.
The 10-17mm fisheye is great for comical shots of your pets, namely 'big nose' effect images. Changing your distance from the subject will enable you to capture lots of quirky images.
Animals can be wary if you approach them with your face directly behind the camera, so let the animal get used to the camera before you try taking photos, and hold it out in front of you using live view mode to minimise animal insecurity.