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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

2026-08-23

Five Star 500/8: Samples [2] - FF - f/8

Camera: Sony a7c (FF, 24MP)
Lens: Five Star 500/8 at f/8

The lens is difficult to use, but it was the cheapest option available some time ago. To achieve better results, the aperture should be closed to f/11, or even f/16.











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Posted by malykh в 09:30 0 comments

2026-08-21

Pentax Q7: DCP file for ART/RT (download)

I created a camera profile for the Pentax Q7 + Pentax Q 01 8.5/1.9 Standard Prime combination.

Download file (2026-08 version): q7.dcp (32KB)

This is a basic camera profile for ART/RT raw converters. It is only single-illuminant (D50) one. It only contains the Base table.


Input Profile (ART): Embedded




Input Profile (ART): Camera standard




Input Profile (ART): Custom: q7.dcp




Posted by malykh в 17:39 0 comments

2026-08-19

Newly built cities of the USSR (1958)

I bought a collection of booklets from 1958.




The collection is titled "Новые города СССР/Villes Nouvelles de l'URSS" (Newly Built Cities of the USSR), and contains booklets about eight cities.




The booklet about Angarsk interests me the most.





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Posted by malykh в 21:57 0 comments

2026-08-17

Front engine transverse with RWD

In the ICE world, a front (front!) transverse mounted engine with rear wheel drive is crazy (like Ford's T-Drive concept). However, this engine layout is reasonable for a series hybrid, regardless of wheel drive.

There are several such rear-wheel drive hybrid cars. For example, Changan Qiyuan/Nevo A06 in EREV/PHEV version (source).

The front-mounted, transverse IC engine acts as a generator only.





There are no half-shafts in the front suspension.




The rear wheels are driven by the electric motor.






By the way, I would like the new Suzuki Jimny to be a series hybrid with a front transverse IC engine (for more cabin space).



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Posted by malykh в 20:53 0 comments

2026-08-15

Pentax Q 04 6.3/7.1 Toy Lens Wide: Samples [2] - 1/1.7" - f/7.1

Camera: Pentax Q7 (1/1.7", 12MP)
Lens: Pentax Q 04 6.3/7.1 Toy Lens Wide, f/7.1 only, without software cropping (29 mm equiv.)

Once again, the Pentax Q7 is better than the Pentax Q.









Posted by malykh в 09:18 0 comments
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