Continuously updated collection of "niche" and "short flange distance" old lenses that have been handled after using a mirrorless camera.
Pentax Auto 110 Series#
Pentax 50mm/f2.8#
Max aperture: f/2.8
Closest focusing distance: 90cm
Diagonal angle of view: 24 degrees
Optics: 5 elements in 5 groups
Filter diameter: 37.5 mm
Size: 43 x 27.2 mm
Weight: 53 g
The standard lens in the series, with a constant f2.8 aperture, decent sharpness, and the second most compact size.
Let's convert the focal length first
110 film size: 13X17mm, surprisingly similar to contemporary M4/3 cmos 😂
Optical Design#
Adaptor Effect#
The adaptation to the Fujifilm X-Pro3 feels quite harmonious (slightly bulky Fujifilm rangefinder shape, combined with a petite lens like the M system).
Sample Images#
- Center image quality: Sharpness is good, color reproduction is slightly warm, contrast is acceptable.
- Edge image quality: Not too much distortion, surprisingly no vignetting on APS-C format (not sure if the image circle can cover larger formats).
Pentax 70mm/2.8#
Max. aperture: 2.8
Closest focusing distance: Unknown
Diagonal angle of view: 17.4 degrees
Optics: 6 elements in 5 groups
Filter diameter: 49 mm
Size: 51 x 50.5 mm
Weight: 160 g
The mid-telephoto portrait lens in the series, also with a constant f2.8 aperture, excellent center sharpness, features a "swirling focus effect," with a metal front element, and the front glass is a large convex lens, not just a telephoto attachment added to the 50mm, but has a different optical design.
Optical Design#
Adaptor Effect#
The adaptation to the Fujifilm X-Pro3 is very harmonious (slightly bulky Fujifilm rangefinder shape, combined with a design that is thick at the front and thin at the back).
Sample Images#
- Center image quality: Sharpness is acceptable, color reproduction is slightly warm, contrast is acceptable.
- Edge image quality: Some distortion, surprisingly no vignetting on APS-C format (not sure if the image circle can cover larger formats).