The SMC 105mm f/2.4 lens is a good fast portrait lens that also does well wide open. It produces a decent amount of CA and is compact and lightweight. Its only downside is a small amount of softness at wide apertures. However, it does have some advantages over more expensive portrait lenses.
The lens offers a large viewfinder, which is a big advantage. Its viewfinder is much larger than a 35mm camera and this can help you get a more accurate depth of field. However, the lens isn’t as easy to focus when handholding. Because of this, it’s best suited for landscapes and scenery shots. The optimum opening range is f/8 to f/16.
The Pentax 67 105mm lens is an excellent choice for anyone with a Pentax 67 camera. This lens has the same focal length as the Pentax 67, but with a higher level of contrast control and non-yellowing glass. This means that the lens has an increased chance of not degrading after a few years.
While the SMC 105mm f/2.4 lens has similar optical performance to the Pentax 105mm f/2.4, the older versions used thorium glass elements that made the lens yellow. The SMC Pentax 105mm f/2.4 Super Takumar uses a high index, non-radioactive glass that eliminates these issues.
The SMC Pentax 105mm f/2.4 has a similar color appearance to the Leica 120mm f/2.4 lens, but is slightly cooler. When used in certain lighting conditions, it tends to show a yellow hue, but is clear against a neutral background. A good lens can produce beautiful images. The Pentax 105mm f/2.4 is an excellent choice for landscape photography.
The Pentax 67 105mm f/2.4 has a 37-degree horizontal field of view and is one of the most popular zoom lenses. The image area is around 53x41cm, and it requires a teleconverter if you want to take close-up portraits.
In addition to excellent color rendering, the Leica 105mm f/2.4 also provides good detail in an image. While the Pentax at f/2.4 fails to deliver sharpness, the Leica has superior resolving power and color correction. It also provides better contrast.