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Post by boomboom on Jul 31, 2015 5:19:13 GMT -5
Nice scope Ian.
How is it? The closest I can get to your set up is a 4" f5 Achro with the ES 30mm 82º....5º TFOV at a large exit pupil, but I don't care the views are impressive. Wondering about what you see with ES 30mm on the Field Curvature front. With mine has the last 15º is a bit mushy, though a tiny turm of the focuser fixes that.
Matt
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Post by astromanuk on Aug 1, 2015 10:28:40 GMT -5
Hi Matt,
In 30mm class eyepieces I have only tried the Nagler 31mm so far and stars are sharp to the edge noting a very slight bloating at the extreme edge but not enough to detract from the view. First light was to test out the lens more than anything which performs much better than I had expected for such a short focal length.
The views overall are quite spectacular and so much better than I used to get from my 5" f/5 with military surplus optics.
When testing the giant 3" ES 100° eyepiece during the day on distant power lines there was considerable field curvature. This makes me believe that it may have difficulty operating at f/5. I hope to get an opportunity over the next couple of days to test it on the night sky. I will also give my 17mm Ethos a go to see how that works.
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Post by stereohead on Aug 2, 2015 2:31:39 GMT -5
Hi Ian, Have you tried it with bino's yet?
John.
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Post by astromanuk on Aug 2, 2015 14:45:40 GMT -5
Not yet John. When I do it will be with my pair of 24mm Panoptics. The 24 Pan works very well with this telescope.
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Post by astromanuk on Aug 10, 2015 7:23:02 GMT -5
I had a very enjoyable couple of hours out with the 150/750 last night.
For the first time I used it with the ES 30mm 100° 3" eyepiece and diagonal. The view was lovely. I did find though that at high elevation there was some flexure in the diagonal body which caused distortion of stars. A little pressure on the underside of the eyepiece cleaned things up. Milky Way fields through this eyepiece with its 4° field of view are amazing. The stars do appear slightly bloated at the very edge of the field but nothing serious enough to detract from the overall view.
I also tried my TV binovue binocular eyepiece with 24mm Panoptics. With the telescope I can use the binocular viewer with a zero power glass path corrector. This presented a beautiful view of the dumbbell nebula at around 30x. More structure was visible than in the big 30mm eyepiece. The binocular view providing a darker sky background and higher contrast due probably to using both eyes.
So, to sum up so far:
Most dramatic view: 30mm 100° ES eyepiece for exceptional milky way sweeping.
Best corrected low power view: 31mm Nagler with 2" TV diagonal. For purists this setup is going to provide the best wide field views the objective is capable of giving.
To bring out dso detail: TV Binovue with 24mm Panoptics.
I am kitting out an accessory case to contain the above together with my 17mm Ethos eyepiece as these are the accessories I will be using with this telescope.
I am really impressed with the quality of images produced by this objective. It is a world apart from the readily available 6" f/5 achromats. Anyone who delights in low power, wide field viewing will be very impressed with its performance.
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Post by Ales - iStar Optical on Aug 11, 2015 16:06:56 GMT -5
I would love to see some kind of report with few photos, if you dont mind sharing this on our webiste. Send it directly to me at ales@istar-optical.com and with your permission I will post this on our website. Thank you!
Ales
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Post by astromanuk on Aug 12, 2015 4:12:51 GMT -5
Hi Ales,
I will try and put something together in the next week or so. Leave it with me. Observing opportunities few and far between at the moment due to a jet stream sending us a succession of low pressure areas and now storms from the South for next few days.
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