Hi Aquaplas,
The 8x30W and 10x40W share the same eyepiece (6 elements in 3 groups), in contrast the 7x42 has a much simpler eyepiece (3 elements in 2 groups)
The x40 and x42 models share the same objective, and all three have the same pattern objective (2 lenses cemented in 1 group)
All three Habichts are sharp. They show a lot of detail on axis
I can't see any difference when comparing my 7x42 and 8x30W - allowing for the difference in magnification
(it's obviously much more difficult trying to directly compare 7x and 10x)
As you may be aware, the 8x30W can show significant veiling glare in some circumstances. However, the 10x40W shows less
and the 7x42 has virtually none (the 7x42's performance is
very close to both my 7x42 Leica UV HD and Zeiss Victory FL)
All have:
• high peak transmission (Swarovski states 96% for all three), and
• high overall transmission (Gijs' testing shows similar flat curves for both the 7x42 and 8x30W, see at:
https://www.houseofoutdoor.com/verrekijkers/verrekijkers-testen-en-vergelijken/ - he's not tested the 10x40W)
All three are known for their very bright and paper-white image
For a detailed review of the 10x40W (including comparison to other 10x binoculars) see that of Roger Vine at:
http://www.scopeviews.co.uk/BinoReviews.htm
- - - -
For a lot more information, including how to maximise the use of the Habichts, see at:
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It should be noted that their common limitations are:
• short eye relief compared to more modern designs, so often too little for those who wear spectacles, and
• the stiff focuser required by the waterproofing, which makes them unsuited for some uses including much birding
- - - -
As I’ve remarked elsewhere, it’s a tribute to Swarovski’s sense of heritage that it continues to offer such a dated but proven design,
while using high grade materials - including state-of-the-art coatings - produced to Swarovski’s usual high quality standards
Significantly, the Habichts are not priced artificially high, so as to be technically available but so overpriced as to be effectively discontinued
Within their limitations they represent great value, especially when taking into account Swarovski’s generous after-sales service
John
Images:
a) Habicht 10x40W
b) SL 7x50 - has the same eyepiece as Habicht 7x42
c) 7x42 Transmission, per Gijs
d) 8x30W Transmission, per Gijs