DRodrigues
Well-known member
At http://www.pt-ducks.com/cr-telescopes.htm#Test_of_2.5x_magnifiers I said that a barlow of 2x that would work in birding telescopes would be the best compromise. Meanwhile I found a modular barlow that could be even better since offered 1.6-2-2.5x http://www.bs-astro.com/index.php?p...ufacturer_id=0&option=com_virtuemart&Itemid=1 . As is not expensive I decided to try it. First contact at the store showed that it focused both at PF100 and Optolyth 100, in all 3 magnifications. I bought it and took it for a better contact on my field conditions. The result was not so good since it doesn't focus at the infinite with 2 and 2.5x magnifications. However the 1.6x works surprisingly well in terms of light and colour definition. Another good point is that using it in a Baader zoom, first version, it focus in the PF100!!! Like that I can have a very good 15-5mm zoom i.e. a 42-126x zoom which can be very useful on my cr-birding. Even more interesting is that I prefer the views through this barlow/Baader zoom combo than through the XFzoom (I use eye glasses), being that at both higher magnifications the combo seems to have more light than the XF! I have to do a more detailed test but the resolution test will take some weeks. I have to compare it to the XF and to the XW5mm.
For now I have 4 different zoom ranges for my Optolyth 100:
- Optolyth 20-60X - use it mostly for digiscopy;
- Baader zoom 25-75x - it focus on my telescope but can't be the case for other Optolyth models or older versions - don't use it since prefer the next for my cr-birding;
- Optolyth 30-90x (the 20-60x for the 80 models, it increases 50% more on the 100) - the higher magnifications allow more resolution so is better for cr-birding;
- Barlow 1.6x+Baader Zoom - results on the mentioned 42-126x - will see if it will replace my XW5 for higher distances resighting...|:d|
David
For now I have 4 different zoom ranges for my Optolyth 100:
- Optolyth 20-60X - use it mostly for digiscopy;
- Baader zoom 25-75x - it focus on my telescope but can't be the case for other Optolyth models or older versions - don't use it since prefer the next for my cr-birding;
- Optolyth 30-90x (the 20-60x for the 80 models, it increases 50% more on the 100) - the higher magnifications allow more resolution so is better for cr-birding;
- Barlow 1.6x+Baader Zoom - results on the mentioned 42-126x - will see if it will replace my XW5 for higher distances resighting...|:d|
David