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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. Kevin Purcell

    NEW nikon monarch 7

    Is that the Japanese marketers picking an extra lucky day (two sevens)?
  2. Kevin Purcell

    ED50 "55mm filter can be attached to objective lens"

    A linear polarizing filter can be a good option when viewing into the sun over flat water (e.g. shorebirds on a marsh with the light in their direction). Or you can wear polarizing sunglasses (with a scope that uses a porro prism system).
  3. Kevin Purcell

    Swarovision 8.32 v. Swarovision 8.5x42

    I hope there's no grease in these focusers (it's not like they're my Yosemites). I wasn't here because I was "using" my bins to look at birds. Mostly the Swaro. Then a spring switch to FL and EDG gave me the contrast on focuser feel. It's interesting how one adapts (plus there is "best bin...
  4. Kevin Purcell

    New Zeiss Conquest HD

    The first set of eyecups on the Zeiss FL (at least ... I'm not sure about the second version of "rounder" eyecups) work as continuously adjustable eyecups. The Yosemites too One of my favorite features of these bins as my two eyes require different eye relief. I wear glasses and have a lot...
  5. Kevin Purcell

    Swarovision 8.32 v. Swarovision 8.5x42

    I've noticed this on my SV 8.5x42 as well. I was rotating around bins and on returning to them (after using the FL and EDG) I noticed how much worse (stiff, asymettric and "gritty") my SVs are. Need to to send them back to Swaro to see what they can do about them. Otherwise I really like them...
  6. Kevin Purcell

    Waterproof EII's?

    Those are going to be big oculars in that bin to see the full field (about 23.4mm minimum diameter if I got the maths right). That should be easy to check.
  7. Kevin Purcell

    SLR Magic 12-36x50 ED Spotting Scope and micro 4/3rds camera adaptor

    Really? That's so disappointing. NDHunter: fortunately I never read it ;)
  8. Kevin Purcell

    PF65EDII Straight need eyepiece

    I concur. I have a PF65 with an XF12 and it's a good alround combo (though the XW14 would be better!). If you give up the JIS 4 water resistance a good fixed astro EP like a fixed Hyperion between 15mm and 12mm works well too. Fixed eyepieces are good solution to this problem. Take a 10mm or...
  9. Kevin Purcell

    SLR Magic 12-36x50 ED Spotting Scope and micro 4/3rds camera adaptor

    SLR Magic are a Hong Kong based reseller/tweaker of Chinese OEM lenses usually. They seem to have repurposed a bunch of C mount CCTV style lenses for micro 4/3rd use with adapters (some good and some bad ... see dpreview for more details) But now they have a 50mm ED scope in the works...
  10. Kevin Purcell

    Zen Ray 7x43 ED3

    On the 7x v 8x issue: it's a very small difference. I find it most useful if you want to own two pairs of the same bin optimized for different habitats or uses then a 7x and a 10x make a good pair. But the 8x is the best single bin compromise. Regarding low light ... unless you are out in the...
  11. Kevin Purcell

    Nikon HG L, 8x32, Allbinos, Tests best.

    Resolution is well defined property measured at center field (so there should be no coma or astigmatism in any sensible optical system) and is measured monochromatically so it says nothing about CA (longitudinal or lateral). Perhaps you are really measuring perceived sharpness (a rather...
  12. Kevin Purcell

    Nikon Premier Se Binoculars

    I have a set of Tarkovsky Stalkers. 7.5x38. Way before their time for Soviet bins. though I think they ended up being OEMed in the West. The first to use with pro-reflective coatings and introspective "The Mirror" coatings on the prisms too. Nice bins though you were never sure quite what you...
  13. Kevin Purcell

    10x42 swrarovision rolling ball and eye cups

    That's exactly it. The "rolling ball" isn't like normal "rolling ball" its more like the edges "roll" or as Kammerdiner more accurately says "does something different out there at the edges". It isn't quite a roll its just a bit of odd motion distortion that stops when the bins stop. Most of...
  14. Kevin Purcell

    swarovision EL

    I guess the SV rainguard comes down to opinion. I love it (as a glasses user so no winged cups for me). It fits on snugly so it never falls off (e.g. in my backpack) but easily comes off when I use it in the rain. The mechanism to keep the IPD generally stays fixed but when it changes it's easy...
  15. Kevin Purcell

    swarovision EL 10x42 or EL 10x50

    Easier eye placement in the exit pupil (so nicer ease of use). With the flat field/sharp edge to edge a larger exit pupil also makes it easier to "look around" the field. Easier than the 10x42, I suspect and similar to the 8.5x. Reduced edge of field glare (though the SV already does well...
  16. Kevin Purcell

    Fullsize bins in the daytime

    That's a magnification realted brightness effect not an exit pupil size effect: lower magnification bins have higher brightness (brightness is photons per unit solid angle not the total intensity of light out of the ocular of the bin). You need to keep one constant whilst varying the other...
  17. Kevin Purcell

    Fullsize bins in the daytime

  18. Kevin Purcell

    Larger scope or XW10?

    The question is would you take a bigger scope with you? There is a brightness/contrast versus magnification trade-off where a lower magnification and higher brightness can help usability with a short EP to help out when you really need that extra magnification. I suspect the ideal EP for this...
  19. Kevin Purcell

    New midsize (and midprice) Swaros in july

    That's not what the video says, Jerry, see my quote: ("Excellent center sharpness ... edge sharpness is very good" from the cheesy video. Subtracting the marketing out of that I suspect it means the center sharpness is good (but not ED glass good!) and the edge sharpness is OK. Only the...
  20. Kevin Purcell

    New midsize (and midprice) Swaros in july

    Now the narrower FOV makes sense. They're trading weight for FOV (i.e. keeping down the amount of glass they need to put in the prism and EP). I'm sure their focus groups find that people don't like heavy bins. Some birder friends of mine tried Monarch recently and the weight is what sold them...
  21. Kevin Purcell

    No interest in the "new" Diascope and the new zoom?

    One way of encouraging interest in the scope is to buy a demo/sample from Cameraland ;) http://birdforum.net/showthread.php?p=2125690#post2125690 #528062 65 T* FL LT DIASCOPE STRAIGHT only $1439.99, reduced from $1899.99 #528064 85 T* FL LT DIASCOPE STRAIGHT only $1829.99, reduced from...
  22. Kevin Purcell

    kowa 824 dislodged prism repair

    Bummer but I'm glad you've got it back in one piece: there is a fun feeling that comes along with seeing a good bird with a bodged together piece of kit. I would expect that the 824 to 823 conversion would require another 45° prism/mirror so its not just changing the housing part. This also...
  23. Kevin Purcell

    New midsize (and midprice) Swaros in july

    They probably do that silently as the bins are produced (as Swaro do). They only add a letter or a * when there is a big change (and I don't think we'll see many of those in AR (T*) or P coatings) Regarding the narrow FOV but you can see Swaro targeting Nikon Monarch buyers/users to upsell...
  24. Kevin Purcell

    Field Curvature vs Pincushion

    They're three different things: two fo them affect how sharp things are at the edge of field. Field curvature is literally the focal plane of a lens(es) is not flat. As Steve says you can change the focus to focus out the field curvature. You can also "accommodate" out" the field curavture...
  25. Kevin Purcell

    Alpen Wings ED 8x42 Bino

    CaF2 isn't a glass it's a crystal. If a marketer says "fluorite glass" it isn't CaF2 just a fluoroposphate crown glass of some sort.
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