Hi, i am Marc of Hamburg/ Germany /north europe i have a D & G 5 inch f18 till at 2001 i am hungry of more Aperture but my question is D&G or Istar ? you can help what can i hope to see with 8 inch on jupiter,saturn ,Mars ?
i made my teleskope mount and refractor tube self
Last Edit: Apr 18, 2014 10:45:26 GMT -5 by mahoref
Post by jamesling1000 on Apr 18, 2014 22:09:05 GMT -5
Although I only have the classic 8" F8.8, but there are many members here enjoying the latest 8" R30, which will give you a much better contrast and lesser CA on planets like Jupiter, Mars and Saturn... Go for F12 if you can manage the length.. My G11 cannot take any length longer than 6ft or 1800mm fl for the 8" ISTAR...
Marc: have you decided what is your preference? Is it focal ratio or aperture? If focal ratio is your preference for planets, double stars and the Moon: I would choose the 8" f12 R35 Istar lens refractor. If aperture is your preference for deep sky observing and comet hunting then choose as big aperture you can afford. I chose the second option and I ordered my Istar 228 mm f7.7 achromatic objective. I also own an Istar 150 mm f/8 R30 refractor and I am very satisfied with it. That is the main reason I am buying again from Istar and not from another company. You can see my build and report about my 150 mm refractor in the Istar ATM forum section under "Meade...". I hope you find the best choice for you.
Istar 228 mm f7.7 refractor on AP900 mount
i live in the middle big city with 1,8 million people with big port or say it harbour. my balcoon measure 55 x 27 inch-there i have my D&G 5"f18 and selfmade german mount with 2"steel axis in both axis. now i build a selfmade german mount with 3" axis my D&G have a very good strehl very small CA on Venus what is the difficult between istar 8inch f 12 and f15 0.90 strehl to 0,93 strehl my favorit is the 220 (8,7") f 15 with 0,93 Strehl but that cost ~750 $ more than the 8"f12-15 1659$ i want like more reviews of the 8 inch f12 can anymore me show some planet sketch or photo with Istar 8 inch ? Regards Marc
It says the year 2019-I'm in my 50th year of life (1.May 2018) and I wonder if there is still an increased experience? SMILE Have now ordered a ISTAR lens D204 f9 achromat March 6, 2019, which just fits just on my balcony! I was inspired by James Ling's Jupiter video I hope I can contribute to the revival of the Istar Forum Now i am owner of D&G FH 5"f18,Apm Apo 140f7 and Istar Achromat 8"f9 Greetings Marc
Hello James I ordered the refractor tube D248 / 238 L 1550 mm in July and arrived in the middle of September. Now missing the tube flange for lens and focuser. Unfortunately, I first have to recover financially and health is also an operation on the left ear - get a cochlear implant. In the spring of 2020, continue with the refractor. Greetings Marc
Post by jamesling1000 on Nov 8, 2019 23:51:28 GMT -5
2020 just few months away... So definitely waiting to hear from you again, especially your first light report... And you should know that 8"F9 will exhibit CA on brighter objects, and if you want to improve its performance, you must get hold of one of those chromacorr, which not only cuts down the CA, but intricate surface details will pop into view especially on Saturn, Jupiter and Mars....