Some observations on the SLC HD focusers . . .
Same Mechanism on all SLC HD’s?
I’d be surprised if the same parts are used for the mechanisms of both the x42 and x56 models
If nothing else there seems to be at least one mechanical consideration - the x56 mechanism is moving a larger part from a greater distance
To get some idea of the relative sizes, see the image that was previously on the Norwegian site:
https://www.kikkertspesialisten.no
Consequently, the 2 may have different haptics
Chronology
The original x42 HD was introduced in 2010 and had a minimum focus distance of 1.9 m
The modified/ current version of the x42 HD was introduced in 2013 (the one with with the all over RA coating - compare the 2 in Chuck’s photo in post #4)
The minimum focus distance was increased to 3.2 m (along with the focuser travel - see below). Swarovski indicated this allowed them the use a simplified focusing mechanism
The x56 HD was introduced in 2013, and has a minimum focus distance of 3.9 m (the previous SLC neu x56 was made until then, and was a wholly different design)
Interestingly, the focuser travel seems to very depending on the particular model and it’s perceived likely use (see below)
Amount of Travel - Infinity to Minimum Focus
A) x42 models:
- Original x42 HD: 1 1/2 turns (to 1.9 m) - per Swarovski’s 2011 catalogue
- Current 10x42 HD: just over 2 turns (to 3.2 m) - per Roger Vine (see the list of his reviews at:
http://www.scopeviews.co.uk/BinoReviews.htm )
B) x56 Models:
- 10x56 HD: 1 turn - per Roger Vine
- 15x56 HD: almost 2 turns - per Roger Vine
( 15x56 neu: just over 1 turn, to 8 m - per Roger Vine)
It would be interesting to know if the above corresponds to the experience of others (and I would not be surprised if there are minor variations)
John