PENTAX 110 LENSES 18mm, 20-40mm, 24mm, 50mm, 70mm

These lenses are for the Pentax 110 camera system

There are adapters available for several camera mounts to use the lenses of the Pentax 110 SLR system. There is also one for the Sony E mount, shown here. As these lenses were made to cover 110 pocket format, which is 13x17mm, you have to crop the sensor of the A7. There is an easy setting for APS-C format on the A7, which is about 24x16mm size, a crop factor of 1.5. This is still bigger than 13x17mm, but I used it nevertheless as it's handy.

There is another problem to use these lenses: the Pentax camera has the aperture behind the camera mount. The lenses have no aperture and they all open to f 2.8. So the lenses are quite soft.

I have ordered an aperture disc system, which will have to be adapted for the adapter. So if this succeeeds, I will show more results later.

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The A7 adapter.

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The adapter and the different Pentax lenses, from left: 24mm, the smallest, 18mm, 50mm, 20-40mm zoom and 70mm.


Focal length: 18mm, a wide-angle of 27mm in cropped format.

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A7 and the lens.

Sample picture: You may click on the sample image for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. Focus set to infinity.

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A little bit of vignetting, but quite o.k., a bit soft towards the edges which could be avoided by further cropping.

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Closest focus goes down to 23cm (!).

Focal length: 20-40mm, a moderate wide-angle of 30mm to a slight tele of 60mm in cropped format.

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A7 and the lens at 40mm setting.

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A7 and the lens at 20mm setting. Yes, it has to be extended for shorter focal length

Sample picture: You may click on the sample image for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. 20mm, focus set to infinity.

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Vignetting at the edges, overall a bit soft due to overcast.

Sample picture: You may click on the sample image for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. 40mm, focus set to infinity.

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Good in the center, only a bit soft for the rest which could be avoided by further cropping.

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Closest focus is 38cm with 20mm setting, 53cm with 40mm setting.

Focal length: 24mm, the standard length of the system. It's moderate wide angle of 36mm in cropped format.

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A7 and the lens.

Sample picture: You may click on the sample image for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. Focus set to infinity.

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O.K. in the center, a bit soft towards the edges
which could be avoided by further cropping.

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Closest focus is only 30cm.

Focal length: 50mm, a portrait length of 75mm in cropped format.

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A7 and the lens.

Sample picture: You may click on the sample image for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. Focus set to infinity.

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O.K. in the center, a bit soft towards the edges with a hint of colour cast which could be avoided by further cropping.

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Closest focus is 89cm.

Focal length: 70mm, a tele length of 105mm in cropped format.

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A7 and the lens.

Sample picture: You may click on the sample image for full resolution. The full resolution image opens in a new window, so you can keep it open for comparison. Focus set to infinity in the first picture.

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The lens is sharp, but has a shallow DOF. See the second picture

A second sample picture. Focus set on the crow sitting on the chimey near the center, which is about 30m away.

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It makes quite a difference although it's only a mm or two from infinity setting. Everything at the same distance is sharp. There is a hint of colour cast towards the edges.

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This is a tele lens, so closest focus is about 150cm.

Maybe I will make an adapter with apertures later. For wide open lenses these perform quite well. They could be interesting for smaller sensor formats and with the use of aperture disks.

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