The type of photography that you are planning to use is an important decision factor. Here we have evaluated the HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye and the Nikon DX Fisheye-10.5mm f2.8G ED for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye is the longer of the two lenses at 70mm. The Nikon DX Fisheye-10.5mm f2.8G ED with a length of 63mm, is 7mm shorter. Besides being longer, the HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye also has a larger diameter of 68mm compared to the Nikon DX Fisheye-10.5mm f2.8G ED's 63mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Nikon DX Fisheye-10.5mm f2.8G ED weighs 300g, 5% (17g) lighter than the HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye's weight of 317g.
Lens Mounts
The HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye has the Pentax KAF lens mount whereas the Nikon DX Fisheye-10.5mm f2.8G ED has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono, Pentax KF and Pentax K-3 III for the Pentax KAF Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Focal Range
HD Pentax-DA 10-17mm F3.5-4.5 ED fisheye has a focal range of 10-17mm and
1.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
15-25.5mm when used on a APS-C / DX format camera.
On the other hand, the Nikon DX Fisheye-10.5mm f2.8G ED is a prime lens with fixed focal lenght of 11mm which has an effective (full-frame 35mm equivalent) focal range of 16.5mm when used on a APS-C / DX format camera.
