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

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  1. T

    Chromatic Aberration, CA, what, why, how?

    I helped at a pop up event the other weekend. The ranger had his scope focussed on some Avocets on the distant island, and as visitors came along many wanted to see them as they were the new attractions jetting in from a close estuary. I could see the island with x8 bins, but not a lot else...
  2. T

    Chromatic Aberration, CA, what, why, how?

    Yes you are quite right. It's an Optolyth straight with a x20 eyepiece. I've learnt quite a few things on the way since my first post, and have now got a Mulepack now which I find a very comfortable way to carry my scope leaving hands free for bins, notes etc. I've taken to walking round with 2...
  3. T

    Chromatic Aberration, CA, what, why, how?

    .... oh no. I think you must be psychic, it is on my mind for exactly those reasons. Plus talking to the person running the event I was at yesterday and overlapping with comments on this forum, the backup and service from them sounds like second to none. That matters to me. I'm not sure about...
  4. T

    Chromatic Aberration, CA, what, why, how?

    Fascinating! Thanks. Q
  5. T

    Chromatic Aberration, CA, what, why, how?

    As I've currently experienced the wettest February for years, I wish I did have a heat haze to worry about. ... though we do have hot summers occasionally!!!
  6. T

    Chromatic Aberration, CA, what, why, how?

    Thank you Joachim. The post I mentioned was against trees and a dark sky so perhaps that was a better test. Yes the Vortex were all current models, HD marked on them, and thanks for the info on the ATX. It was lovely to use.
  7. T

    Chromatic Aberration, CA, what, why, how?

    Just returned from a demonstration field day. My wife was buying a new pair of binoculars and whilst she gave them a good test, I nosed around the telescopes on offer. I had the chance to look at a Swarovski ATX85 ( can't remember what eyepiece ), and Vortex Viper and Razor, both 65mm. The...
  8. T

    Chromatic Aberration, CA, what, why, how?

    Just going through these posts this morning. The historical viewpoint is fascinating, and I'm aware it continues through to now. I remember going to a field day by the same retailer that I'll be visiting today. It was in the early 1990's. Kowa had just introduced their new ED glass scopes. Soon...
  9. T

    Chromatic Aberration, CA, what, why, how?

    Thanks, will do.
  10. T

    Chromatic Aberration, CA, what, why, how?

    Thank you. I'm starting to understand it is because different wavelengths behave differently and that ED glass fluorite etc can make a difference and possibly improve things. Hopefully tomorrow I'll be able to sample different scopes and yes, will be taking all this advice with me in my head...
  11. T

    Chromatic Aberration, CA, what, why, how?

    As I'm considering updating my scope, and if I do will probably experience zoom eyepieces for the first time, this is something I need to be aware of. That's the reason I'm picking everyone's brains here, and finding peoples comments very helpful.
  12. T

    Chromatic Aberration, CA, what, why, how?

    Thank you Hermann. My scope has a x20w eyepiece and so far I've not been aware of it but if I'm looking through higher magnification eyepieces it might become apparent. I will bear it in mind when sampling the scopes. Thank you for that thought!
  13. T

    Chromatic Aberration, CA, what, why, how?

    Thanks for your thoughts. I'll keep my fingers well and truly crossed when having a look on Sunday!
  14. T

    Chromatic Aberration, CA, what, why, how?

    Oh fair comment. I must admit to not seeing it yet, I just wanted to try and understand what it was. As said, despite using top notch microscopes in my working life I've not been aware, nor using my bins and older scope. I hopefully will be at a field day this weekend, and want to look at other...
  15. T

    Chromatic Aberration, CA, what, why, how?

    Thanks for your comment. It's an intriguing topic! I have no idea if I'm aware of it or not, but something I hope to keep in mind when looking down some modern optics at the weekend.
  16. T

    Chromatic Aberration, CA, what, why, how?

    Now I've woken up a bit, I've gone through both articles mentioned by tenex. Definitely need to re-read several times to get to grips with it. I get the impression that a lot of the fundamental research was carried out very early by the then pioneers, von Siedal and Petzval mentioned in the...
  17. T

    Chromatic Aberration, CA, what, why, how?

    Morning. Thanks both. Will read the articles and inwardly digest. All helps build my knowledge. I will make a mental note to try and be aware if looking through a new to me scope and not just be bowled over by something new. Might be difficult though!!
  18. T

    Chromatic Aberration, CA, what, why, how?

    Thanks Arthur, that's very informative! Have given it a quick read and will go back over it again slowly. Having used top quality optical microscopes for extended periods of time when working it's something I'd never come across, though it is mentioned in the article. I've not noticed it when...
  19. T

    Chromatic Aberration, CA, what, why, how?

    Hi Gang, As a newbie seeking advice, I keep seeing the comment, chromatic aberration, usually abrieviated as 'CA', frequently popping up when discussing binoculars and telescopes. From reading reviews and comments, it seems to me it is an optical affect that outlines the target object being...
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