Orion 127 Maksutov Cassegrain
Posted 18 October 2010 - 05:33 PM
I might buy this telescope but need to know if it will suffice on a heavy duty tripod. I read a whole bunch of reviews and everybody said the optics are first rate for planetary and the moon and this is what I want it for.
I just need to know if it can be used on a tripod for viewing planets and the moon and if the views will be fairly steady on a tripod.
Posted 18 October 2010 - 07:57 PM
"I had a chance to use my Orion 127 MCT last night to observe the Moon and Jupiter. Seeing allowed me to view up to 300X without image breakdown. I use the Orion SCT adapter so I can use my 2" diagonals. Star test from the factory were excellent with Polaris and indoors with my Hubble Artificial Star at 60'. I would say for planetary work it compares well with my TV102. I use it on my lightest goto mount iOptron Cube."
Posted 18 October 2010 - 08:12 PM
Posted 19 October 2010 - 08:43 AM
I use it for visual frequently on camera tripods and my feelings are mixed. I have the Manfrotto carbon fiber 055CXPRO4 with 468MGRC4 head. I found:
a) The telescope has fairly long focal length (1540mm). When viewing planets you need high magnification. So even when I bring the Hydrostatic Ball head's friction to the one that just holds the telescope, it is difficult to point. You need the fine-tuning knobs of an equatorial mount.
b) The tripod vibrates since the telescope is heavy compared to a camera. If you do not touch it though you can get good views.
c) Since it is not that heavy, adding a Vixen dovetail to this telescope and using any cheap equatiorial mount that came with any starter telescope, improves the feeling a lot. I frequently use the mount that came with 130EQ - no problems.
Keep in mind that with this OTA you can easily do even astrophotography. It is my favorite travel scope. See attached image as a sample. It is not the best this telescope can do, I just quickly found one sample.
Astrophotography setup was:
a) Skywatcher Maksutov 127 + Canon EOS 450D unmodified (imaging) – Prime focus + Red-dot finder
b) TS 80/400 Guidescope + ALCCD5 guide camera (guiding). Both telescopes are on a parallel mount.
c) PHD guiding
d) NEQ-6 Skyscan, ALCCD5 connected to ST-4 port
e) Location: Filyro, Thessaloniki, Greece. 05/07/2010 at 23:00 till 01:00
f) Exposure: 5x 5min light, 5x 5min dark frames.
g) No filters, correctors, etc. used
h) Processing: Deep-Sky-Stacker + Photoshop
Posted 19 October 2010 - 09:29 AM
Posted 19 October 2010 - 09:48 AM
Yannis: That globular image is incredible !!!
Posted 19 October 2010 - 10:24 AM
Make sure to get the 2" eyepiece adaptation. This scope worked fine even with my Hyperion 31 eyepiece. Also it makes connecting cameras far more easy.
It has no problems with backfocus. I mean none! It focused even with the Celeston Off-axis guider!
I am still in search of a good-quality, focal reducer for astrophotography. I tried with the TS 0.5x reducer (2") but I get only 75% of the QHY9 frame illuminated properly. I am searching something in the range of 0.66x - 0.8x so as to bring down the f/ratio to f/8 or lower.
If you use it in a yard, that has any street-lights or similar objects close by, I suggest you use a dew-shield (from Orion or even home-made) because in some angles, stray light hitting the Maksutov corrector shows artifacts inside.
I got also from Teleskop-service a Vixen/Skywatcher dovetail meant for cameras (PSFotoDel) . I attached this at the bottom of the OTA with three screws and I use it regularly on my mounts. I could not find a Vixen dovetail that would fit exactly at the holes of the OTA and I am too lazy to start drilling holes and cutting dovetails.
Posted 19 October 2010 - 11:22 AM
Posted 19 October 2010 - 11:25 AM
Posted 19 October 2010 - 11:51 AM
I might buy this telescope but need to know if it will suffice on a heavy duty tripod.
Just what do you mean by a "heavy duty tripod?" There are some tripods (both wooden and metal - and even some carbon fiber) that will support a total weight of 44 - 55 lb. (depending on model).
Posted 19 October 2010 - 03:51 PM
Being far too eager to try it out when it arrived I tried it on a cheap camera tripod. The difficulty is in aimimg and fine adjusting with enough control to bring the desired objects into the field. On my LXD75 mount, it is superb... but a lesser mounting might offer plenty of support.
Optically, I'm very pleased with the 'scope. Although there has been limited time to use and assess it so far, I have been impressed with the quality of images.
Posted 19 October 2010 - 04:56 PM
Posted 20 October 2010 - 02:00 AM
The view of jupiter @ 128x was incredible to say the least !!! Super crisp views with zero CA anywhere. I then star tested polaris on it at about 192x......diffraction rings inside of focus showed perfectly round even diffraction rings....outside of focus was almost the same....the scope was not fully cooled so a test will be in order at a later date.
Overall, I was really happy with the views it gave me of the moon and Jupiter.....more later when I get this on a better mount. I fixed the problem and re-mounted it on my tripod with solid results. it came with a 2" visual back so I can get a 2" diagonal when needed and 2" eyepiecs.
It seems as though Kermit likes it too.