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

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  1. W

    New MM4 50 vs part-used Nikon ED50

    The apparent brightness is related to the exit pupil (aperture divided by magnification), though in the day your eye pupil is often smaller and thus effectively aperture limits your optics. As it gets darker you pupil gets bigger and hence you want to have as large an exit pupil as you can to...
  2. W

    New MM4 50 vs part-used Nikon ED50

    The time you can view will depend on the magnifications. If the focal ratios are the same then the exit pupil (brightness) will be the same across the magnification ranges… the smaller scope resulting in lower magnifications. Peter
  3. W

    New MM4 50 vs part-used Nikon ED50

    I only use the lowest power if I have trouble pointing the scope, the narrow field of view doesn’t provide as much help as a wider one would. I then normally tune the zoom to give the best balance of detail and brightness for the conditions (normally 25-32x ish) and keep it there. I only crank...
  4. W

    New MM4 50 vs part-used Nikon ED50

    I tend to use my Befree live a little lower than I need so it’s easier for people of different heights to have a look when I observing with a group. If it’s not windy then the stability seems fine. I’d be interested in your 23x vs zoom comparison. Peter
  5. W

    New MM4 50 vs part-used Nikon ED50

    I use a 190 for my larger kit, but with the 501ah it’s a brute to carry. Replaced with a Befree live. Yes it’s not as stable and one axis lock knob is easily confused with the clamp release (I’ve added tape so my fingers don’t adjust the wrong one). But it fits in the backpack nice and easily...
  6. W

    New MM4 50 vs part-used Nikon ED50

    I lightened my scope setup recently and was going for the kowa ts501, but secondhand and other things resulted in me getting a 60MM4ED. The low end of the zoom is a bit narrow. I’d like a fixed 27x, but as noted a little lower power gives a brighter image for those dim situations, which is more...
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