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

Recent content by DrHPI

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    8x56 SLC

    In the attached photos you can see a handy non-fixed version of the finnstick developed by my friend Harri Slag that I have been using in Finland for over ten years with good results. It is based simply on friction and works well with most roof binoculars that have not got the open bridge...
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    8x56 SLC

    I have been using the 8x56 SLC since February. With winter clothes on there is no need for harness. Five hour winterbird counts (by walking) have not been a problem. I, of course, use a finnstick which is a non-fixed version of this essential tool. I try to post some photos later. Nowadays I...
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    Finch sickness

    Summer feeding is a source of so many hazards for birds that it should be a punishable offence. At least no bird lover should practice it.
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    Garmins GPSMap 64s vs 60Csx

    I have been using the 64s in the forests of Finland for two bird counting seasons now (summers 2014 and 2015) with good results. Before that I was using Colorado 300. It seems that the 64s gives a bit more accurate and stable coordinates due to its dual satellites (GPS + GLONASS), especially in...
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    Leica Ultravid HD Warranty Update

    I have understood that it is the regulations of the European Union which determine this 10 year maximum for warranties.
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    38x or 20-60x for Nikon RA III A WP (non-ED)?

    This morning I had a chance to look through the 82mm Nikon RA IIIA spotting scope at a bird tower. It had the 20-60X zoom ocular. The view was sharp at the low end but begins to soften at magnifications higher than 40X. I would recommend that you try the scope with both oculars (38X wide and...
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    cleaning binocular lenses

    Zeiss has a pdf booklet on cleaning optics. To put it briefly, they recommend the use of 100% certified pure cotton (to be wrapped around wooden sticks) and petroleum ether (boiling point max +44 C) or alternatively 85% petroleum ether + 15% isopropanol. (They also teach the correct cleaning...
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    Living Bird 2008 Scope Review

    If their chart is to be believed, the ED50 came with the old 13-30X zoom (25-56X for 82mm) which has even worse eyerelief than the new MCII zoom. Seems that sellers want to get rid of older eyepieces and so they combine them with a bestseller scope with absurd results (compare e.g. the same...
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    Good Handling versus extra Brightness

    It's difficult to say what weight one should assign to the "handling properties" of binos. I am tempted to claim that many reported handling difficulties are simply a negative transfer effect from what you are used to. And consequently in time you can get used to many different kinds of binos...
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    Swarovski 8x32EL - Calling all owners!

    For Nikon you should go the original site and then choose the English version (just as you do with Swarovski or Zeiss): http://nikon.topica.ne.jp/bi_e/index.htm Heikki
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    Fed up with punctures

    Here in Finland I do all my birding trips by bicycle also during the winter months. That's 9000-10000 km per annum. I haven't had any significant problems with punctures. My bike is a Crescent Trekking, I only have a hand pump and never carry spare tubes with me. On average my inner tubes last...
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    Ivalo area, Finland - Xmas 2008

    Actually there will be five hours twilight and 19 hours night.
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    Finder scopes on spotting scopes?

    Having tried a cable tie sight before, I can confirm that this little device really works. HPI
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    My New Toy!

    Actually the DS eyepieces don't have a flimsy eyecup because they have no eyecup at all. Instead they have a rubber cover for the metal parts of the eyepiece so that they can't scratch your eyeglasses. Heikki
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    Finder scopes on spotting scopes?

    Thanks Kimmo! I had heard of the cable tie sighting device many times but never knew exactly what it was. After your explanation I already have one installed on my new ED 82 A and the only thing that remains to be done is the calibrating. I noticed, however,that a cable tie can easily be...
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