dorubird
The unskilled mechanic blames his tools!

Zeiss SF 10x42 focuser is the best I've tried. I can characterize it as very butter smooth and quick response to the slightest movement. Also, the position of the focus wheel in the center of gravity of the binoculars, which is closer to the eyepieces, plays an important role in perfect ergonomics and stability. I took a very suggestive picture of how Zeiss SF can balance over the edge of "the abyss" by more than half of its length. Do not try this at home 


Nikon MHG 8x30 focuser is a bit firm, exactly as I needed. It has a kind of "elastic" movement with very pleasant viscosity feeling. This pleasant elasticity, however, takes away a little from the accuracy of movement
Swarovski Habicht 7x42 came with a very stiff focuser. But this disadvantage is compensated by the fact that has accurate focuser without jerking, and has a smooth spin, like a knife in a hardened butter. After using it over time, it lost some of its stiffness, becoming easier to spin and more pleasant. However, it has the stiffest focuser of my binoculars. I think this feeling is also due to the fact that the focus wheel is metal and very thin compared to its diameter (for example Habicht focuser it is three times thinner than Leica Ultravid 8x20 focuser, and twice larger in diameter than Leica one. This makes it hard to spin)
Leica Ultarvid 8x20 focuser has firmness and accuracy throughout the movement but has a slightly grainy movement that makes it feel less smooth/ continuous. However, the focus wheel is very large for a pocket binoculars, making it more ergonomic, easy to handle and increases spin comfort.
Bonus
My Swarovski EL 8x32 specimen that I tested had a grainy and inconsistent movement. Swarovski focuser moves more easily in one direction than the other, with a slight hesitation when changing direction
Even if I have my personal preferences reflected in this table, personally I can get used to any of these focusers, and I can learn the habit curve of each binocular very easily!



Nikon MHG 8x30 focuser is a bit firm, exactly as I needed. It has a kind of "elastic" movement with very pleasant viscosity feeling. This pleasant elasticity, however, takes away a little from the accuracy of movement

Swarovski Habicht 7x42 came with a very stiff focuser. But this disadvantage is compensated by the fact that has accurate focuser without jerking, and has a smooth spin, like a knife in a hardened butter. After using it over time, it lost some of its stiffness, becoming easier to spin and more pleasant. However, it has the stiffest focuser of my binoculars. I think this feeling is also due to the fact that the focus wheel is metal and very thin compared to its diameter (for example Habicht focuser it is three times thinner than Leica Ultravid 8x20 focuser, and twice larger in diameter than Leica one. This makes it hard to spin)

Leica Ultarvid 8x20 focuser has firmness and accuracy throughout the movement but has a slightly grainy movement that makes it feel less smooth/ continuous. However, the focus wheel is very large for a pocket binoculars, making it more ergonomic, easy to handle and increases spin comfort.

Bonus
My Swarovski EL 8x32 specimen that I tested had a grainy and inconsistent movement. Swarovski focuser moves more easily in one direction than the other, with a slight hesitation when changing direction

Even if I have my personal preferences reflected in this table, personally I can get used to any of these focusers, and I can learn the habit curve of each binocular very easily!

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