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2026-10-03

"A city on the Angara river": Panoramas (3)

Two more (also see 1, 2) panoramic images taken from the "Город на Ангаре" (A city on the Angara river) documentary.



The second image shows one of the buildings with large lettering that is poorly visible. It reads, "Наша цель - коммунизм" (Our Goal is Communism).



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Posted by malykh в 09:59 0 comments

2026-09-27

Rear derailleur: the chain length

11-speed: Shimano RD-M8000 (Deore XT), RD-M9000 (Deore XTR), source: DM-RD0004-09-ENG.pdf




12-speed: Shimano RD-M6100/M5100/M5130 (Deore), RD-M7100/M7120 (SLX), RD-M8100/M8120/M8130 (Deore XT), RD-M9100/M9120 (Deore XTR), source: DM-MARD001-05-ENG.pdf






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Posted by malykh в 16:01 0 comments

2026-09-25

Staeble-Werk Choro R 35/4.5: Samples [5] - 135 film - f/4.5

Camera: Zorki-6
Film: Ilford Pan F Plus ISO 50 (135 B&W)

There is no rangefinder coupling with this combination. So, scaling focusing was used.








Posted by malykh в 17:56 0 comments

2026-09-23

Makita LXT tools (2026-09)

I use these cordless tools that are compatible with the Makita LXT 18V battery.


Makita DUR181RF - Grass trimmer

Makita DCL281FZ (BL) - Vacuum cleaner (with Makita 191D73-9 cyclone attachment)

Makita DUC150Z (BL) - Pruning chainsaw

Makita DTW285Z (BL) - Impact wrench (1/2")

Makita DGA504Z (BL) - Angle grinder (125mm)

Makita DHW180Z - Pressure washer


Posted by malykh в 17:58 0 comments

2026-09-21

Honda 89160-PK1-405 (for 06161-PY0-900)

The installation manual (Honda 89160-PK1-405) that was included with a thermo-wax throttle valve assembly (Honda 06161-PY0-900).

 



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Posted by malykh в 14:45 0 comments

2026-09-19

Shimano BB-MT500-PA bottom bracket

The Shimano BB-MT500-PA bottom bracket: Hollowtech II (24 mm), Press-Fit MTB (92 mm or 89.5 mm).



Note the 2.5 mm spacer (for the 89.5 mm bracket shell only).





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Posted by malykh в 17:50 0 comments

2026-09-17

Pentax M 200/4: Samples [3] - FF - f/4

Camera: Sony a7c (FF, 24MP)
Lens: Pentax M 200/4 at f/4










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Posted by malykh в 15:25 0 comments

2026-09-15

HP Z24n G2: Calibration factory report

The report was included with the HP Z24n G2 monitor.




I hope there were actual measurements, and data is not fake.

Posted by malykh в 08:06 0 comments

2026-09-13

TOPUMP TB2 Pro: Tire inflation tests

I ran some tests with the TOPUMP TB2 Pro electric pump to see how long it would take to inflate tires before the pump ran out of power.

I waited 60 seconds between each attempt to allow the pump to cool down slightly.


#1: 0 to 2 bar for 1 min 27 sec
#2: 0 to 2 bar for 1 min 42 sec
#3: 0 to 2 bar for 1 min 51 sec
#4: 0 to 0.8 bar for 38 sec, and it's over.

Another tire after fully recharging the pump.


#1: 0 to 3 bar for 1 min 41 sec
#2: 0 to 3 bar for 2 min 01 sec
#3: 0 to 1.8 bar for 1 min 28 sec, and it's over.

So, with a fully charged pump, it is possible to inflate an MTB tire two to three times (from zero).

Posted by malykh в 09:30 0 comments

2026-09-11

VIOFO A119 Mini 2: Night sample

A fox is running across a road. This is just a sample night video from the VIOFO A119 Mini 2 dash cam.




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Posted by malykh в 11:02 0 comments

2026-09-09

Pentax Q 02 5-15/2.8-4.5 Standard Zoom: Samples [1] - 1/1.7" - 5mm - f/2.8

Camera: Pentax Q7 (1/1.7", 12MP)
Lens: Pentax Q 02 5-15/2.8-4.5 Standard Zoom at 5mm and f/2.8 (23mm equiv.)

The profiled lens correction is disabled in the raw converter.

Thanks to the larger sensor, the standard zoom lens on the Pentax Q7 has a shortest focal length equivalent to 23 mm. This is very good for an old compact camera. However, there is noticeable distortion.

In my opinion, the lens is too slow. I would like the lens to be 5-15/2-2.8, at least. The reason for that: the flange focal distance is too large for a mirrorless camera. It's 9.2mm with a 9.3mm sensor diagonal. This is similar to an SLR camera.








Posted by malykh в 11:26 0 comments

2026-09-07

My triplet lenses (2026-09)

Now, I have six triplet lenses (two more than in 2024). All of them have 3 optical elements in 3 groups.


The rear row (from left to right):



Posted by malykh в 10:10 0 comments

2026-09-05

Sony ZV-1/ZV-1A: Aperture on focal length

I extracted EXIF data from images taken with a Sony ZV-1A camera, and collected triples:

FocalLength (FocalLengthIn35mmFormat): MaxApertureValue - in terms of exiftool

 9.4 mm (24 mm): f/1.8
 9.5 mm (24 mm): f/2.0
 9.6 mm (24 mm): f/2.0
 9.7 mm (24 mm): f/2.0
 9.8 mm (25 mm): f/2.0
10.0 mm (25 mm): f/2.0
10.1 mm (25 mm): f/2.2
10.2 mm (26 mm): f/2.2
10.4 mm (26 mm): f/2.2
10.4 mm (27 mm): f/2.2
10.5 mm (27 mm): f/2.2
10.6 mm (27 mm): f/2.2
11.0 mm (28 mm): f/2.5
11.1 mm (28 mm): f/2.5
11.2 mm (29 mm): f/2.5
11.3 mm (29 mm): f/2.5
11.4 mm (29 mm): f/2.5
11.5 mm (29 mm): f/2.5
11.8 mm (30 mm): f/2.5
12.4 mm (32 mm): f/2.8
12.5 mm (32 mm): f/2.8
13.2 mm (34 mm): f/2.8
13.6 mm (35 mm): f/2.8
13.8 mm (36 mm): f/2.8
14.1 mm (37 mm): f/2.8
14.9 mm (39 mm): f/2.8
15.5 mm (41 mm): f/2.8
15.7 mm (41 mm): f/2.8
17.2 mm (45 mm): f/2.8
17.4 mm (46 mm): f/2.8
17.8 mm (47 mm): f/2.8
19.2 mm (51 mm): f/2.8
20.5 mm (55 mm): f/2.8
20.9 mm (56 mm): f/2.8
23.8 mm (64 mm): f/2.8
24.4 mm (66 mm): f/2.8
25.7 mm (70 mm): f/2.8

This shows the dependency of the wide open aperture on the real focal length (and the equivalent focal length). For example, the f/1.8 aperture is available at the shortest focal length only. It suddenly becomes f/2.0 at a slightly longer focal length.



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Posted by malykh в 09:22 0 comments

2026-09-03

Cycplus G1: One year

One year ago, I mounted a GPS bike computer. It is a Cycplus G1.

My main purposes are GPS speedometer, GPS odometer, and GPS clock. It's OK. However, I would like the clock to be permanently visible on the status bar.




For the year, I rode about 4200 km on two bikes: first the Cannondale Cujo 1 (~1250km, September-December), and then on the Flyxii FR-701 (~2950km, January-August).

Posted by malykh в 10:35 0 comments

2026-09-01

Carl Zeiss Jena Biometar MC 80/2.8: Samples [2] - 6x6 - f/2.8

Camera: Kiev-6S (6x6, 0.55x "crop" factor)
Film: Expired 32 years ago Svema FN ISO 32 (120 B&W) exposed as ISO 1-2
Lens: Carl Zeiss Jena Biometar MC 80/2.8 at f/2.8 (44 mm equiv.)

There are still a lot of spots, but it's better than it could be.








Posted by malykh в 18:32 0 comments

2026-08-29

Another De Dion on EV

Here's yet another (see also 1, 2) example of a De Dion rear suspension on a modern electric vehicle (Daihatsu e-Hijet, also known as Toyota Pixis Van BEV, also known as Suzuki e Every).

This time, the suspension has coil springs and a Panhard rod.


(flipped vertically, source)




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Posted by malykh в 09:01 0 comments

2026-08-27

"A city on the Angara river": Panoramas (2)

Two more panoramic images taken from the "Город на Ангаре" (A city on the Angara river) documentary.





Large lettering is visible on a building. The poor image quality makes it impossible to read. I don't remember exactly what it said, but I think it was something like "Путешествуйте по озеру Байкал" (Travel on Lake Baikal).



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Posted by malykh в 18:21 0 comments

2026-08-25

My first tubeless puncture

Some time ago, I got a puncture in the front tubeless bike tire (Maxxis Rekon Race 29x2.4[WT]). Unfortunately, the sealant didn't help because it had dried out (after several months). So, out in the field, I used a cheap tubeless tire repair kit:




It was easy, and the electric pump was very helpful.

I rode over 100 km with the "bacon strip" (the tire plug) without any problems.




Then, at home, I removed the strip and applied a tire patch.




Everything is okay with the tire now.



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Posted by malykh в 23:06 0 comments
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