glend
08-11-2017, 09:25 AM
In my reading I have come across a couple of new scopes coming to market in the next few months. One is the Teleskop Express TS Photoline 125mm APO, @ native f7.8 reduces to F6, uses a FPL-53/Lanthan objective, with a 2.5" R&P focuser standard (likely upgradable). Expected delivery from manufacturer is 10/01/2018. It looks like they are accepting pre-orders now:
https://www.teleskop-express.de/shop/product_info.php/info/p10133_TS-Optics-PhotoLine-125mm-f-7-8-FPL53-Lanthan-APO---2-5--Focuser.html
Cost looks to be $1910 AUD (before shipping and GST).
Secondly, there is the review of the prototype AT152 EDT, on CN,
https://www.cloudynights.com/topic/595808-first-light-with-the-prototype-astro-tech-at152edt/
Astronomics advised: "The glass is an f/8 triplet using FK-61 and a Lanthanum element. Price is US $3999 (currently $5232 AUD).
Delivery would be Early Spring 2018, Possibly late February if everything went perfectly. "
So that works out to a focal length of 1216mm at f8, it reduces to f6,4 (or 972,8mm). Weight is quoted at 25 lbs. I am not convince that a FK-61/Lanthan objective is going to be as good as a FPL-53 objective, I suppose it depends on the design, but there is a significant difference in the Abbe numbers for FK-61 and FPL-53. Time will tell.
Any other new scopes you have run across?:question:
https://www.teleskop-express.de/shop/product_info.php/info/p10133_TS-Optics-PhotoLine-125mm-f-7-8-FPL53-Lanthan-APO---2-5--Focuser.html
Cost looks to be $1910 AUD (before shipping and GST).
Secondly, there is the review of the prototype AT152 EDT, on CN,
https://www.cloudynights.com/topic/595808-first-light-with-the-prototype-astro-tech-at152edt/
Astronomics advised: "The glass is an f/8 triplet using FK-61 and a Lanthanum element. Price is US $3999 (currently $5232 AUD).
Delivery would be Early Spring 2018, Possibly late February if everything went perfectly. "
So that works out to a focal length of 1216mm at f8, it reduces to f6,4 (or 972,8mm). Weight is quoted at 25 lbs. I am not convince that a FK-61/Lanthan objective is going to be as good as a FPL-53 objective, I suppose it depends on the design, but there is a significant difference in the Abbe numbers for FK-61 and FPL-53. Time will tell.
Any other new scopes you have run across?:question: