Re: [OM] (OT) Field Glasses recommendations - Chuck comments on exit pupil diameter

[Chuck Norcutt]

I think she may be good.  I'm sure that the diopter adjustment is 
relative to the other eyepiece so it shouldn't matter what the focusing 
distance is.  If it will go beyond infinity I should think that will 
combine with the -2 on the diopter to go further minus.  I'm in the 
house now and the furthest thing I can see is a tall radio tower that 
I'd guess to be 1/2 mile or further away.  I put the 200/4 on my OM-1 
with split image screen and that combination thinks the tower is at 
infinity.  When it's focused the focusing collar is hard up against the 
infinity stop.  Then I decided to try the 70-300 on the E-M5 at 300mm 
first with autofocus followed by manual adjustment.  At 300mm on the 
E-M5 the tower is not at infinity but there's not much focusing beyond it.
If I try the same thing on the Pentax 8x25s it focuses way, way beyond 
the tower.  If I think of it and the moon is out tonight I'll try again 
on the moon which any optical system will say is at infinity.
Chuck Norcutt


On 12/25/2014 2:27 PM, Mike Gordon via olympus wrote:
> Thanks flutteringby Moose and Chuck.  Yes the Pentax website says +/- 2
> diopters for the 8X25's.  I really don't know enough about these items.
> I don't know if that is the correction between left and right
> or the overall correction.  I suspect 6ft is often close enough as any
> closer I will have my flutterby macro kit at the ready.  The -2 could be
> an issue.  Looking into this a bit more I see NABA (North Am b'fly
> Assoc) has a page on b'fly binoculars but they are not as gear savvy as
> here. Have a presentation at the Pituitary Soc meeting followed by
> another meeting in San Diego in  March and I see Marnie bought a flt to
> SF as well as hers to SF, so perhaps can try Moose's again if all works
> out.
>
> Hovering over a couple choices but unable to land yet, Mike
>
>
>
> CN writes:
>
> > > No markings on diopter correction eyepiece.  Maybe Pentax site has
> specs.
>
>
>
>
> On 12/24/2014 5:36 PM, Mike Gordon via olympus wrote:
> > Oh, forgot to ask about diopter corrections.  It seems one adjusts
> this
> > so each eye is sharp but what if say Marnie uses w/o contacts and has
> a
> > -4 or -5 correction.
> > It would seem one might be able to focus closer but infinity focus
> might
> > be an issue unless it allows one to focus well past it for those with
> 0
> > correction required.
> >
> > Mike
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