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2026-04-05

Pentax Q 07 11.5/9 Mount Shield Lens: Samples [2] - 1/1.7" - f/9

Camera: Pentax Q7 (1/1.7", 12MP)
Lens: Pentax Q 07 11.5/9 Mount Shield Lens f/9 only (53mm equiv.)

The larger sensor provides better resolution in the center, but the area off-center is more blurred. The lens still needs light, with f/9 and 1/100.



(ISO 1250, Noisy!)








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Posted by malykh в 10:35 0 comments

2026-04-03

MIT license for some of my projects

I have applied an MIT license to my projects:


    https://github.com/malykhcom/w95k_tvh
Posted by malykh в 10:43 0 comments

2026-04-01

Shimano B05S: Disc brake pads

New disc brake pads Shimano B05S:




Old pads Shimano B01S (OEM from Cujo):



I am not sure whether the new pads are genuine or fake. They have worked well overall since I started using them in autumn. However, they sometimes squeak in rainy or snowy conditions.

Posted by malykh в 08:37 0 comments

2026-03-29

M39x1 extension tubes

I have several sets of M39x1 extension tubes.




1. Old four-tube set, USSR, KMZ (КМЗ).




Tube lengths: 5mm, 8mm, 16.4mm, 26mm.


2. Old four-tube set, USSR, FED (ФЭД).




The same tube lengths: 5mm, 8mm, 16.4mm, 26mm.


Why is the tube length 16.4 mm? This tube is used to mount earlier Zenit SLR M39x1/45.2 lenses to M39x1/28.8 rangefinder cameras: 45.2 - 28.8 = 16.4 (mm)


3. Modern three-tube set, China, no-name.




Tube length: 7mm, 14mm, 28mm.

These lengths were more common for M42x1 tubes, but now they are also used for M39x1.

Posted by malykh в 10:25 0 comments

2026-03-27

Samsung NX 45/1.8: Samples [2] - APS-C

Camera: Samsung NX20 (1.5x crop factor, 20MP), Samsung NX300M (1.5x crop factor, 20MP), Samsung NX500 (1.5x crop factor, 28MP)
Lens: Samsung NX 45/1.8 at f/2.5-f/2.8 (68 mm equiv.)

The profiled lens correction is disabled in the raw converter.

(NX20, f/2.8)

(NX300M, f/2.8)

(NX300M, f/2.8)

(NX300M, f/2.8)

(NX500, f/2.8)

(NX300M, f/2.8)

(NX500, f/2.5)



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Posted by malykh в 10:58 0 comments

2026-03-25

Flyxii FR-701: With large boots

The rear derailleur cable housing routes through the right chainstay of the Flyxii FR-701 frame.




This makes shifting easier because the cable moves more smoothly.

However, this creates an unexpected issue. If your shoes are large-sized or bulky, the heel of your right shoe may touch the cable housing.




This isn't an issue for me overall, but I have occasionally touched the cable housing several times in winter boots.



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Posted by malykh в 08:42 0 comments

2026-03-23

Ricoh GR: F-numbers

My F-number statistics for all stored images that were taken with the Ricoh GR.

f/5.6: 5663 - 61.61%
f/2.8: 1557 - 16.94%
f/4.0: 566 - 6.16%
f/5.0: 491 - 5.34%
f/4.5: 464 - 5.05%
f/3.5: 182 - 1.98%
f/6.3: 113 - 1.23%
f/3.2: 103 - 1.12%
f/7.1: 36 - 0.39%
f/8.0: 6 - 0.07%
f/16.0: 6 - 0.07%
f/13.0: 2 - 0.02%
f/10.0: 1 - 0.01%
f/11.0: 1 - 0.01%
f/14.0: 1 - 0.01%

Total: 9192 images

I should note that I usually use the P mode. And the P mode of the Ricoh GR likes f/5.6 very much when there is enough light. Otherwise, it prefers f/2.8. Other F-numbers are not very popular, or I select them manually.

This makes me think that the Viltrox AF 28/4.5 (FE) lens only needs two aperture settings: fully open at f/4.5 and fully closed at f/8. Therefore, its aperture mechanism could be very simple.

Posted by malykh в 07:30 0 comments

2026-03-21

Split crown race

The headset that came with the frame includes a fork crown race ring (39.8 mm). However, when I installed the headset, I used a split crown race instead.





A split crown race is easier to install and remove.



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Posted by malykh в 09:06 0 comments

2026-03-19

Anastigmat Victar 50/2.9: Samples [2] - FF - f/2.9

Camera: Sony a7c (FF, 24MP)








Posted by malykh в 07:23 0 comments

2026-03-17

Race Face Chester: Flat pedals for winter

My new flat pedals for the winter season.




They are the Race Face Chester Yellow (PD20CHEYEL).




I have tried them out, and they are much better than my previous cheap ESLNF flat pedals, which had a lot of free play.


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Posted by malykh в 08:11 0 comments

2026-03-15

http:// -> https://

All http-links to malykh.com and malykh.blogspot.com have been replaced with https-links in all posts.

Posted by malykh в 09:06 0 comments

2026-03-13

Vittoria e-Barzo Trail 29x2.6: Tubeless mount

In 2019, I tried to make tires tubeless on a few occasions (see 1 and 2). However, the rims were not suitable for this.

This time, I have a different set of tires and wheels. So, I tried it again.

I installed these tire valve stems.




I used inexpensive "universal" (for bikes, motorcycles, cars, and so on) tire sealant. Since it is winter, I mixed the sealant with antifreeze/coolant.




It works well. I already rode 300+ km without any problems despite the cold weather. This may be due to the relatively low tire pressure. I use 1-1.5 bar (14-21 psi), or even less.

It will be interesting to see how it goes in the summer with the different tires I want to use.

Posted by malykh в 09:19 0 comments

2026-03-11

Pentax Q 01 8.5/1.9 Standard Prime: Samples [2] - 1/1.7" - f/1.9

Camera: Pentax Q (1/1.7", 12MP)
Lens: Pentax Q 01 8.5/1.9 Standard Prime at f/1.9 (39mm equiv.)

The profiled lens correction is disabled in the raw converter.

I was disappointed with this lens when used on the Pentax Q. However, the Pentax Q7, which has a larger sensor, produces better results. The angle of view is wider, and the resolution is higher. This combination is quite usable. One notable issue is distortion. I wish it were less.








Posted by malykh в 08:22 0 comments

2026-03-09

Additional seatpost clamp

The PostFix BSP-97 is an additional clamp (27.2mm, 31.6mm) that is installed directly onto the seatpost, on top of the frame's seatpost clamp. It is very useful for a carbon frame.

I wanted to make something similar for the 31.6mm seatpost. For the base, I used a standard seatpost clamp for a 31.8mm seat tube. However, such a clamp has a lip that secures it to the seat tube.




This lip must be removed. I used a grinder to do so.

After all, I have two versions of processed clamps.

The two-bolt clamp (40g):




The one-bolt clamp (21g):




Both work well.

Why don't I use a dual-size seatpost clamp? They are 31.6mm/34.9mm, usually. But I need one that is 31.6mm/37mm.



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Posted by malykh в 10:38 0 comments

2026-03-07

VIOFO A119 Mini 2: Bitrate problem

The VIOFO A119 Mini 2 dash cam has a quite good sensor and lens. However, the main problem is too low bitrate, even with proper settings.

The video quality is good for static scenes. While motion of the car introduces too many artifacts.

For testing, I recorded the same scene with the maximum bitrate setting for each mode.

2592x1944 30fps 29870kbps
2560x1600 30fps 30207kbps
2560x1440 60fps 26845kbps
2560x1440 30fps 30800kbps
2560x1080 60fps 30737kbps
2560x1080 30fps 30931kbps
2304x1296 30fps 24874kbps
1920x1080 60fps 25077kbps
1920x1080 30fps 22855kbps

Yes, the bitrates are too low for high resolutions.

Also, there is no any resizing. A smaller resolution results in a smaller angle of view due to cropping.

I chose the 2560x1080 30fps mode. The 21:9 aspect ratio is suitable for a dash cam (and I also used the WideHD 2560x1080 mode with the TrendVision TDR-719S).




And the ~3000kbps bitrate is satisfactory for this mode.

Posted by malykh в 09:54 0 comments

2026-03-05

Cannondale Cujo 1 (2018): The end

My Cannondale Cujo 1 bike is no more. I took it apart completely.

The frame is cracked, and I didn't want to weld it. So, I threw the frame away.




By the way, the size "L" frame weighs 1950 g without any parts attached. It's lighter than I expected based on its appearance.

I mounted some stock Cujo 1 components (the fork, steering, and brake parts) on my new bike.

Posted by malykh в 09:03 0 comments

2026-03-03

Riconar/Rikenon 55/2.2: Samples [3] - FF - f/2.2 - Two types of focusing

Camera: Sony a7c (FF, 24MP)
Lens: Riconar/Rikenon 55/2.2 at f/2.2

Here's another comparison between the two types of focusing: focusing by the lens mechanism, and focusing by the lens adapter. See more details.

The difference is more noticeable when the focusing distance is shorter.

1.

(lens focusing)

(adapter focusing)

2.

(lens focusing)

(adapter focusing)

3.

(lens focusing)

(adapter focusing)

4.

(lens focusing)

(adapter focusing)

Posted by malykh в 12:06 0 comments
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