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

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    Any customer review of new tsn-99?

    This has been a pain in the ass for me also. And I also decided that I won't actively try to find good 99A sample anymore, since it seems that they are so rare. I'm pretty good with my current 883. Regards, Juhani
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    Any customer review of new tsn-99?

    I received sixth sample of Kowa 99A and here are the star test results: In this sample SA seemed to be better than in any former samples I've had, not perfect yet but on the outside pattern there were quite a few inner rings to be seen. In the inside pattern, there seemed to be bright central...
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    Any customer review of new tsn-99?

    That's really great customer care... Regards, Juhani
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    Any customer review of new tsn-99?

    Kimmo, you are right. The triangular shape was also seen with naked eye. I didn't see any bright corners when oufocused as far as in the pictures but with just 2 rings I wondered why the central ring seemed to be more like 3 bright dots close to other rather than uniformly round one, could that...
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    Any customer review of new tsn-99?

    Today I got a fifth sample of Kowa 993. This sample had some quite obvious astigmatism, vertical yellow prism line was very visible with blue lines on both sides and it also had overcorrection of spherical aberration. The result was noticeably worse image quality than my Kowa 883 sample when...
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    Any customer review of new tsn-99?

    Yes these have too many rings to be sure but in my opinion there can be seen spherical aberration as on the other side there is bright central area and no very clear rings and on the other side central area is dimmer and outer rings quite clear. Looks a bit same kind of zonal(?) errors which...
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    Any customer review of new tsn-99?

    Well, that would not be a surprise. I have seen at least 7 Atx95 samples and none of them could be described as a lemon and most were at least good samples but of the Kowa99's I have seen (4 samples) in my opinion at least one was a lemon, one was not very far from being a lemon, one was...
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    Any customer review of new tsn-99?

    Hi, why exactly would you go back to the Swaro 95? Did you find Swaro 95 be optically better? Regards, Juhani
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    Any customer review of new tsn-99?

    I didn't have time yesterday to to do any comparisons but today I was able to compare this 993 sample to my 883 and not very surprisingly found that my 883 was quite clearly the sharper one already at relatively low magnification. I didn't bother to do any resolution measurements (even if this...
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    Any customer review of new tsn-99?

    Hi, I got an opportunity to test fourth sample of Kowa TSN-99. I used 30-70x zoom + 1.6x extender and an artificial light point. Quite familiar story: Prism line visible: Check. Astigmatism: Check. Coma: Check. Spherical aberration: Check. Below are pictures I took with my smartphone...
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    Any customer review of new tsn-99?

    I haven't seen Linnut magazine review but I had an opportunity to star test third sample of 99- Kowa. I used zoom + 1.6x extender and artificial star indoors. The distance was maybe little short to see SA correctly but I also had my 883 as a comparison and it showed similar results regarding SA...
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    Any customer review of new tsn-99?

    Haven't heard anything specific but from a source I personally trust: out of six samples two were optically defective, I don't know what was causing them to be so bad but I guess one could bet at least for an enourmous SA...But anyway, the most interesting thing was that among the other four...
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    Any customer review of new tsn-99?

    I don't want to jump to conclusions but; trusting on these pictures, this sample looks like having a much better weaker side than the two samples I tested: at least there is weak outer ring just to be detected and I imagine to see some faint inner ones also. The bright central point I saw is...
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    Any customer review of new tsn-99?

    Hi Binastro, That triangular form was three sided but it was not very strong and mostly disappeared when unfocused further. I didn't even thought about thermal stabilising. Would it have that strong effect if scope was brought from room temperature (or storage) to outside where it was +13°C...
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    Any customer review of new tsn-99?

    I just tested two samples of Tsn-99 and found that both had huge spherical aberration, reminding (or even surpassing, not in a good way...) my former scope, Leica Apo Televid82. The other had slightly triangular rings (on the other side; the other side was just fuzzy, dim sphere with no rings...
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