The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Nikon AF-S Fisheye 8-15mm F3.5-4.5 and the Tamron 11-18mm f4.5-5.6 II LD 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. Nikon AF-S Fisheye 8-15mm F3.5-4.5 is the longer of the two lenses at 83mm. The Tamron 11-18mm f4.5-5.6 II LD with a length of 79mm, is 4mm shorter. On the other hand, the Tamron 11-18mm f4.5-5.6 II LD has a larger diameter of 83mm compared to the Nikon AF-S Fisheye 8-15mm F3.5-4.5's 78mm 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. Tamron 11-18mm f4.5-5.6 II LD weighs 355g, 26% (130g) lighter than the Nikon AF-S Fisheye 8-15mm F3.5-4.5's weight of 485g.
Lens Mounts
The Nikon AF-S Fisheye 8-15mm F3.5-4.5 has the Nikon F (FX) lens mount whereas the Tamron 11-18mm f4.5-5.6 II LD has the Nikon F (DX) lens mount. Some of the latest released cameras that are compatible with these mounts are Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount and Nikon D3500, Nikon D7500 and Nikon D5600 for the Nikon F (DX) Mount.
Focal Range
Nikon AF-S Fisheye 8-15mm F3.5-4.5 has a focal range of 8-15mm and
1.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
12 - 22.5mm.
On the other hand, the Tamron 11-18mm f4.5-5.6 II LD has a focal range of 11-18mm and 1.6X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 16.5-27mm when used on a APS-C / DX format camera.
