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Lorenzino Studio

Lorenzino Studio

"Short flange distance" old lens adapter record

Continuously updated, a collection of "niche" and "short flange distance" vintage lenses handled after using a mirrorless camera.

Pentax Auto 110 Series#

Pentax 50mm/f2.8#

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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.

First, let's convert the focal length
110 film size: 13X17mm, surprisingly similar to contemporary M4/3 CMOS 😂
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Optical Design#

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Adapter Effect#

Adapting to the Fujifilm X-Pro3 actually feels quite harmonious (slightly bulky Fujifilm rangefinder shape, combined with a petite lens resembling the M system).
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Sample Shots#

  • Center image quality: Sharpness is good, color reproduction leans warm, contrast is acceptable.
  • Edge image quality: Not too much distortion, surprisingly no vignetting on APS-C format (uncertain if the image circle can cover larger formats).
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Pentax 70mm/2.8#

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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 medium focal length portrait lens in the series, also with a constant f2.8 aperture, excellent center sharpness, featuring a "swirling focus effect," with a metal front element and a large convex lens, distinctly different from the 50mm lens with a telephoto attachment.

Optical Design#

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Adapter Effect#

Adapting to the Fujifilm X-Pro3 yields a very harmonious effect (slightly bulky Fujifilm rangefinder shape, paired with a design that is thick at the front and thin at the back).
image

Sample Shots#

  • Center image quality: Sharpness is acceptable, color reproduction leans warm, contrast is acceptable.
  • Edge image quality: Some distortion, surprisingly no vignetting on APS-C format (uncertain if the image circle can cover larger formats).
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More works, welcome to follow#

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