It's called the RockStar or AstrHori 1.8/35.
It has an unusual design with two filter threads. The "inner" thread is 52mm, it moves back and forth when focusing, but it doesn't rotate. The "outer" thread is 58mm, it doesn't move when focusing, but it does rotate.
If you use a filter on the 52mm thread, you can't use a cap on the 58mm thread at close focusing distance.
The minimum focusing distance is about 29cm, which is good. The hard stop focuses to infinity, which is rare for a Chinese lens.
The aperture has 9 blades:
Also note the yellow tint, this will be an important consideration.
The aperture ring with click stops: f/1.8, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16.
Optical design: 9 elements in 7 groups
This lens (on the right) compared to the Samyang AF 35/2.8 (on the left) and the Cheecar FF 35/1.4 II (in the center):
The lens is quite large and heavy.
See also related notes:
- RockStar/AstrHori 35/1.8: Samples [2] - FF - f/1.8 (2025-01-11)
- RockStar/AstrHori 35/1.8: Samples [1] - FF (2024-04-25)
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