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

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  1. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, the 15-45x for HDF zoom on MM4-50 is a typo - it's correct in the description of the body. Not sure if an upgrade from HDF zoom to SDL makes sense - if you can use the HDF with it's slightly shorter eye relief, all you would gain is a little more field of view. Joachim
  2. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, thanks for the high mag images - I see what you mean with the Kowa being a bit worse, but the image is still perfectly usable which is impressive for a non ED scope at that price point. Have fun with your MM3! Btw, which zom did you get with the MM3- SDLv2? Joachim
  3. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, thanks for a nice review - the only thing which could have been better were images at higher magnification as the two low mag shots don't really show the differences mentioned as these get more pronounced at higher magnification. I can understand that want to keep the Opticron - it's nice...
  4. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, congratulations on two nice scopes - looking forward to a comparison! The MM3-50 and HDF zoom should better have the edge optically - they're a bit more than double the price of the little Kowa when bought new. If you got them for a little more than the Kowa new, you got a good deal! Joachim
  5. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, still not really sure what you mean with portholing. Anyways, the Kowa 501 has 46 deg afov at 20x (which is narrow) and 64 deg at 40x (which is not too shabby and in the same ballpark as your SE). The fact that the magnification increases but no new information is visible happens when you...
  6. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, please do keep us posted - I hope you like the 501 as well as I did the example I tried... Not quite sure what you mean with the "image getting smaller" - there is two effects to be seen when using a zoom EP and changing the zoom factor (besides the obvious magnification change): - when...
  7. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Having tried the 56mm and the Kowa 501 side by side at a telescope meeting I didn't bother to get any astro EP to try more magnification with the Celestron. At least with the examples present the Kowa won by a big margin and offered a useful image at 40x. f3.5 in the celestron is too fast for...
  8. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, I just did - it's 52 to 47m for the zoom... but with an afov of 40 deg or so the zoom feels like looking through a soda straw... I would choose the 27x, if I had an ED 50. Regarding brightness at higher magnification - that is expected, the question is, if it's still sharp at that...
  9. J

    Nikon ED50 vs MM3/4 50/60 vs Kowa TSN-501

    Hi, first of all, welcome to Birdforum! All the models you mentioned are going to be a good choice. The Nikon with the 27x is going to be spectacular due to its super wide field, but getting other magnifications (which the body is well capable of - 50x should be no problem) is going to be...
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