BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="Chosun Juan" data-source="post: 3477405" data-attributes="member: 92780">Ok, let's put this little misunderstanding to rest, as you both seem to have missed the mark of what Jan is saying.  :brains:Jan is talking about the protrusion of the focus wheel above the bridge in the "depth" direction (or thickness in the commonly used binocular dimensions of HxWxD) ie. if you look from the objective end of the binoculars, it is the height that the focus wheel is above the bridge.Jan is saying that the NV focus wheel sits flush with the top of the bridge, the SV's wheel just peeks above by the rim, and the SF has the largest diameter focus wheel which sticks up the greatest height above the bridge. Hope the photo below serves to illustrate what Jan is saying.[ATTACH]604010[/ATTACH]FWIW, in a 42mm bin, which I find small in the hand and with a wide bridge, such as an ED3, I place my middle finger of the focusing hand on the bridge which eliminates any SV dogleg of the focusing finger as shown in the Zeiss advertising!  :eek!:Bruce, you make a good point (it just wasn't Jan's!  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />  about measuring the distance of the focus wheel from the eye end of the eyecups. As the position of the focus wheel and bridge construction determine where your hands are placed, this distance compared to the centre of mass of the binocular determine it's balance.If the centre of mass is located in the center of the hands the bin would feel balanced in the hand. If the centre of mass is located behind the centre of the hands, then the bins will have a rearward weight bias as in the case of the SF with it's combination lightened objectives, heavier oculars, and forward shifted focuser. This is somewhat desireable for extended viewing, and a welcome innovation.  However, if this achieved soley by moving the focus wheel way forward, then the load on the shoulders increases, and it becomes more smoke and mirrors.If the centre of mass is forward of the centre of the hands, then the binocular will tend to tip forward, and you would be in possession of one of the rare AV models  (Ant Viewer!  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />   :-OHope this helps   o<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />Chosun  :gh:</blockquote>

Verification