PENTAX Q +KINO SANKYO 13mm F1.9
D-mount lenses for use with the PENTAX Q: Part 1
A review and photo examples of the KINO SANKYO 13mm F1.9.
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Table of contents
Gallery
- The sample photos were taken with a Pentax Q7.
Review
1．Overview
The KINO SAKYO 13mm F1.9 is a D-mount lens with a focal length of 18mm, which when converted to a 35mm equivalent focal length is a medium telephoto lens with a focal length of 99mm for the PENTAX Q and Q10, and 94mm for the PENTAX Q7 and Q-S1.
Although I purchased the lens second-hand, it came with a full set including a lens hood, lens front cap, and lens rear cap. The price was reasonable, about the same as the regular price of a Pentax Tolens. It seems that a few years ago it was available for about half that price.
2．Usage
The image is blurry at the widest aperture of F1.9, and even with 4x magnification and focus peaking on the Q’s rear LCD, it’s hard to tell where the focus is, so I feel it’s necessary to use focus bracketing to make more precise cuts. Stopping down to around F4-5.6 makes it much easier to see where the focus is, and the shots look crisper. However, when you stop down, vignetting on the edges becomes more noticeable. I’ll talk about vignetting later, but there’s nothing you can do about it since it’s not a problem with the lens’ image circle.
I haven’t been able to determine whether the problem with the lens I own is the accuracy of the adapter or the lens itself, but the infinity position is a bit off, with infinity focused at about 3m on the lens index, and the minimum shooting distance is about 0.8m, and my eyeballing of the lens index and the minimum shooting distance (the lens index has a minimum shooting distance of 1m, but it can be extended a little further from there) seem to be roughly correct.
I use a K&F Concept mount adapter to attach lenses to the PENTAX Q. Amazon Japan sells several types of adapters, and the cheapest one can be purchased for around 1000 yen.
D-mount lenses are lenses for 8mm shooting (shooting range 4.4 x 3.31 mm). The size of the 1/2.3 sensor used by the Q and Q10 is 6.2mm x 4.7mm, and the size of the 1/1.7 sensor used by the Q7 and Q-S1 is 7.5mm x 5.6mm, so both sensors exceed the shooting range assumed by D-mount lenses, and lenses with a small image circle that do not have room in the lens design will have vignetting at the periphery.
The lens is attached to the camera using a φ26.5mm screw mount, and lenses with focal lengths of 6mm to 100mm are available on the market.
Since the PENTAX Q does not have a mechanical shutter, a sensor shutter is used when using this lens.
Since the PENTAX Q has a small sensor size, which is about 5 times the focal length in 35mm, there is no problem with the focal length on the telephoto side, so what we expect from D-mount lenses is a short focal length of about 6mm to 19mm. However, looking at the lens test results left on the web by our predecessors, it seems that many lenses have a small image circle on the wide-angle side, so there is a high possibility of vignetting on the edges. The only options are to make use of the vignetting or to crop.
Prices for D-mount lenses have already risen, so I don’t intend to actively collect them. If I come across one at a second-hand shop at a reasonable price, I will increase my collection.
3．Add Info.
With the 2020s, the PENTAX Q series of cameras has been discontinued, making it difficult to use D-mount lenses. The Nikon 1 series with a 1-inch sensor has also been discontinued, making it difficult to use these lenses.
One possible alternative is Sony’s mirrorless camera with an APS-C size sensor, for which a D-mount to E-mount conversion adapter2 is available. Since the sensor size is APS-C at 23.6 x 15.6 mm, it will need to be cropped before use.
If cropped to the same size as the PENTAX Q, about 1/3 of the 24-megapixel sensor, or 8 megapixels, will be usable. 8 megapixels should be enough for normal use, so I’ll give it a try sometime.
仕様
| 項目 | KINO SANKYO |
| 焦点距離(mm) | 13 |
| Q10・35mm版換算焦点距離 | 72 |
| Q7・35mm版換算焦点距離 | 60 |
| 最大絞り | 1.9 |
| 最小絞り | 16 |
| 絞り羽根 | 5 |
| レンズ構成 | 不明 |
| 最短撮影距離(m) | 0.8 |
| レンズ長(mm) | 32.5 |
| レンズ最大径(mm) | 27.8 |
| フィルター径(mm) | – |
| 重量(g)（アダプター込み） | 84 |
| リリース年 | ? |
| 参考価格 | 5,000- |
参考文献・参考リンク
更新履歴
- 2024.06.29
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