Pentax Q 03 3.2/5.6 Fish-eye: Samples [2] - 1/1.7" - f/5.6

Camera: Pentax Q7 (1/1.7", 12MP)

Lens: Pentax Q 03 3.2/5.6 Fish-eye, f/5.6 only, without software cropping (15mm equiv.)

As before, this lens is more useful with the Pentax Q7 than with the Pentax Q. Interestingly, the angle of view is too wide without software cropping, revealing some of the lens at the corners. Also, keep your hands away from the lens. Otherwise, they will be visible in the corners of the image.

See also related notes:

• Pentax Q7: Angle of view with 03, 04, 05 lenses (2025-12-17)
• Pentax Q 03 3.2/5.6 Fish-eye (2025-05-23)

Image albums:

• Pentax Q 03 3.2/5.6 Fish-eye

SZ Viewer A1-2026-10-09 (Android)

SZ Viewer (Android) changes:

1. Target API level 36 (Android 16).

2. Minor changes and bug fixes.

See also related notes:

• SZ Viewer: общая информация (2014-02-15)

"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).

See also related notes:

• "A city on the Angara river": Panoramas (2) (2026-08-27)
• "A city on the Angara river": Panoramas (1) (2026-08-09)

Image albums:

• Angarsk

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

Image albums:

• Bicycle

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)

Lens: Staeble-Werk Choro R 35/4.5 at f/4.5

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

See also related notes:

• Staeble-Werk Choro R 35/4.5 (M39x1/44): Very rare wide-angle triplet (2023-10-05)

Image albums:

• Staeble-Werk Choro R 35/4.5

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

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).

 

See also related notes:

• Honda: карбюратор (механизм choke opener) (2015-02-10)

Image albums:

• Honda

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).

Image albums:

• Bicycle

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

Camera: Sony a7c (FF, 24MP)

Lens: Pentax M 200/4 at f/4

See also related notes:

• Pentax M 200/4 (2016-06-08)

Image albums:

• Pentax M 200/4

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.

See also related notes:

• Монитор HP Z24n G2 (24", 1920x1200) (2020-09-11)
• Недорогой источник опорного напряжения (ИОН) на AD584LH (2018-04-09)

Image albums:

• PC

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.

Maxxis Rekon Race 29x2.4[WT]

#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.

Kenda Small Block Eight 27.5x2.1

#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).

See also related notes:

• TOPUMP TB2 Pro: Electric mini pump (2026-08-05)
• Maxxis Rekon Race 29x2.4[WT] (2026-06-01)
• Kenda Small Block Eight 27.5x2.1 tires (2025-07-31)

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.

https://www.youtube.com/watch?v=_QAxs5remU4

See also related notes:

• VIOFO A119 Mini 2: My new dash cam (2026-02-09)

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.

Image albums:

• Pentax Q 02 5-15/2.8-4.5 Standard Zoom

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 front row (from left to right):

Pentax Q 05 18/8 Toy Lens Telephoto (Pentax Q)

Staeble-Werk Choro R 35/4.5 (M39x1/44)

Anastigmat Victar 50/2.9 (M40x1/44)

Staeble-Kata E 45/2.8 (M39x1/44)

The rear row (from left to right):

ISCO Iscovitar 50/2.8 (M42x1/45.5)

Carl Zeiss Jena Triotar 85/4 (M40x1/44)

See also related notes:

• Carl Zeiss Jena Triotar 85/4 (M40x1): Long-focus uncoated (non-T) triplet lens (2025-08-07)
• Pentax Q 05 18/8 Toy Lens Telephoto (2025-07-05)
• My triplet lenses (2024-08) (2024-08-27)
• Staeble-Kata E 45/2.8 (M39x1/44): Standard triplet for Braun Super Paxette II (2024-06-24)
• ISCO Iscovitar 50/2.8 (M42x1/45.5): Triplet with simple focusing mechanism (2024-05-21)
• Staeble-Werk Choro R 35/4.5 (M39x1/44): Very rare wide-angle triplet (2023-10-05)
• Anastigmat Victar 50/2.9 (M40x1): Uncoated triplet from 1940s (2023-07-24)

Image albums:

• Carl Zeiss Jena Triotar 85/4
• ISCO-Göttingen Iscovitar 50/2.8
• Pentax Q 05 18/8 Toy Lens Telephoto
• Staeble-Werk Choro R 35/4.5
• Staeble-Kata E 45/2.8
• Victar 50/2.9

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.

See also related notes:

• Sony ZV-1A vs Sony ZV-1 (2026-07-23)

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).

See also related notes:

• Flyxii FR-701: My new bike (2026-02-23)
• Мой новый велосипед: Cannondale Cujo 1 (2018) (2018-10-06)

Image albums:

• Bicycle

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.

See also related notes:

• Expired Svema FN 32 (2026-08-13)
• Carl Zeiss Jena Biometar MC 80/2.8 (P6): Medium format lens (2025-05-16)

Image albums:

• Carl Zeiss Jena Biometar MC 80/2.8

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.

(source)

(flipped vertically, source)

(source)

See also related notes:

• Toyota Hilux BEV rear axle (2026-08-03)
• Mercedes-Benz G580 EQ rear axle (2025-08-13)

Image albums:

• Electric vehicle