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This morning My friend Henry and his lovely wife stopped by my home on their way to a luncheon date. Mrs. Henkmeister has known my mother for years and wanted to make a visit.
At 11:30 they arrived and the two ladies settled into a chatty visit while Henry and I huddled to our own chat.
Henry had with him a largish box.
Inside this largish box was a 6 inch f/5 newtonian, Bresser 150S.
Now I have another toy to explore and compare with my other toys. I plan on a side by side on the SW AZ/EQ mount with my AR 152 frac. This should be an interesting conserving session.
I will report back to you all.
P.S.
As per my usual anatomical interest in all things mechanical I have completely dissected this new tool and overhauled the 10/1 crayford focuser. It is as smooth as silk!
Unfortunately the sky is overecast tonight or I would be out there now.
After a quick overhaul of the crayford focused I slipped out into the drive to find an open hole in the sky.
I found one !
Seeing and transparency were very poor, but I was able to get first light.
I expected some coma at the edge if the field. There was no coma that I could discern.
I used my docter 12.5 with is wide fov. Stars were pinpoints across the field, edge to edge.
I did not expect this. I am very pleased.
This is a very light weight and "short" six inches. It is light enough I may be able to mount it on my binocular tripod. Will see about that.
I had it on the LXD mount and I can see that the SW in alt/az mode may be a better fit.
I also plan a velvet flocking for this tube.
After overhauling the focuser recollimating was quik.
Very pleased.
Marcus, better in the hands of a visual expert than in the dustbin of my storage garage. I hope it ends up performing beyond your wildest imagination. With little to no coma in an f/5 Newtonian that's a real achievement on the part of the opticians. Must be righteously parabolized for both visual and AP. I know the few frames I shot through that tube last year before putting it in storage showed very little coma out to the edges or any other optical "defects."
Telescopes: Meade LX90 10-inch f/10 UHC Coma-free SCT; Explore Scientific 127mm f/7.5 APO ED triplet refractor; Explore Scientific 102mm f/7 APO ED triplet refractor; Explore Scientific 80mm f/6 APO ED triplet refractor; Skywatcher 72mm f/6 ED Schott doublet refractor; Meade 70mm f/5 APO quadruplet astrograph refractor; Skywatcher Quattro 8-inch f/4 Newtonian astrograph; Orion 6-inch f/4 Newtonian astrograph; Skywatcher SkyMax 180mm f/15 Maksutov; iOptron 150mm f/12 Maksutov; Orion f/9 Ritchey-Chretien RC astrograph Eyepieces: Set of 7 Baader Hyperion eyepieces, 3 Meade 5000 glass handgrenades; 1970s era Japanese manufactured Meade 12.5mm Orthoscopic, and too many other eclectic eyepieces to list Mounts: Skywatcher EQ6-R Pro mount; Orion Atlas EQ-G mount Post-production Software: Not good enough … oh, okay ... Canon's proprietary CanoScan ArcSoft 9000F photoshop suite
Hankmeister3 wrote: ↑Thu Oct 24, 2019 8:21 pm
Marcus, better in the hands of a visual expert than in the dustbin of my storage garage. I hope it ends up performing beyond your wildest imagination. With little to no coma in an f/5 Newtonian that's a real achievement on the part of the opticians. Must be righteously parabolized for both visual and AP. I know the few frames I shot through that tube last year before putting it in storage showed very little coma out to the edges or any other optical "defects."
I am looking forward to getting this out to Penfield the next time we go.
Ok.
Question.
Is it possible that the 3 inches of extension I have to put on the focuser could have something to do with this apparent lack of coma in visual observing with this Newtonian?
Beautiful acquisition! I currently own two 150/750mm Newts - the StarBlast 6 on a table top Dob mount and the Celestron Omni XLT 150 on a CG-4 mount. Sadly, I've not tested them out on the night skies yet - looking forward to hearing further reports with your new 6" F/5.
Fortunately, I picked up the longer version of the Bresser 150S OTA, the 150L (focal length of 1200mm or F/8), last year. This size of OTA is no longer readily available here as a standalone OTA, much less mounted on an EQ - only on a Dobsonian. Like the two aforementioned scopes, I've not unleased this scope on the heavens yet.
Scopes: Reflectors, refractors, and 1 catadioptric. Ranging in aperture from 50mm to 150mm.
Thank you, Terry.
I am headed out right now. First light at my best dark site.
I have it on my LXD75 mount.
I know that I will have to figure out the balance aspect on this EQ mount.
"The Hankmeister" Celestron 8SE, orange tube Vixen made C80, CG4, AZ-EQ5 and SolarQuest mounts.
Too much Towa glass/mirrors.
Solar:
H/A - PST stage 2 mod with a Baader 90mm ERF on a Celestron XLT 102 (thanks Mike!)
Ca-K - W/O 61mm, Antares 1.6 barlow, Baader 3.8 OD and Ca-K filters with a ZWO ASI174mm.
W/L - C80-HD with Baader 5.0 & 3.8 Solar film, Solar Continuum 7.5nm and UV/IR filters with a Canon EOS 550D. Member of the RASC