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By LR Watanabe
For Deep-Sky AP of mostly galaxies (and nebulae), what'll give me the best results– a medium-weight 130 P-DS or a very lightweight wide-field WO Z61? I know the "best" telescope is one that doesn't just collect dust all day long, but I just can't figure it out. Supporting said telescope will be the SW HEQ5 PRO Synscan (with the Rowan Astronomy belt attached), which will be supported further by a autoguiding system, possibly a very lightweight CF 32mm refractor with a ZWO ASI 120mm Mini (Can't find the -S model in Japan). On the telescope'll be the Canon EOS 600D, quite a heavy beast IMO.
Instead of leaving it here, I'll say (just blurt out) everything I know about these seemingly-equal telescopes.
The 130 P-DS, clocking in at F/5, will produce fantastic photos of Nebulae and Galaxies alike, although its aperture will slightly limit the galaxies it'll see. It seems this telescope does particularly well when it comes to imaging M81 or M51, and Nebulae like the Rosette. Its price-performance ratio is basically unbeatable, as it's only 250$ over here in Japan and it cranks out fantastic images. The only addition I'll need will be a F/5 SW-issued Coma Corrector; however, I don't need to worry as I'll be getting one from me mum in a few week's time.
The William Optics Z61, which has a slightly higher F number of 5.9. It sports 2 lenses with FPL-53 elements in them, allowing for extremely high contrast images of nebulae like the Rosette, Orion, all that lot. I've previously asked a similar question, and I've been convinced by the answer that "I won't really be able to take images of galaxies other than M31, Andromeda, and M33, Triangulum. So why do I even have this as an option when I could just go with the cheaper 130 P-DS? Well because it's a wide field APO. Everything it supports, whether it be the design to the focuser, is just amazing, so much so I can't emphasise the emotion enough.
On Astrobin, I've checked out what kind of images these telescopes produce, and I encountered a problem– pretty much everyone was using everything but the 600D. They all used the fancy Mono-cooled CCDs like the ZWO ASI 1600MM Pro.
This is the first lights of my ASA 12"N f/3.62 (purchased in 2007) with my Moravian G4-16000 CCD camera using one KAF-16803 chip of 36mm x 36mm (4K x 4K).
The adjustments, collimation, ASA OK3-Z pression screws, asked a lot of attention.
For a precise collimation, i use the CATSEYE XL & XLKP kit.
This is the first 3hrs of exposures taken the last weekend in one night. The second night was too windy unfortunately.
Full Resolution image in 4K x 4K here :
Full Resolution Annotated image here :
All the information below :
So,after observing in my backyard for a month + (visible targets only in orion taurus auriga and monocerus) , i ve decided to start observing from my front yard.Now ,i see a whole new sky Ursa Major Leo, Virgo and more.A week ago , was the first time i saw a galaxy.To be exact,m81,m82 and m64.I cannot describe what i felt when i took a look throught the eyepiece,i was amazed.Even though they were just faint fuzzies with no detail whatsoever,it was magestic. Then, i tried to observe m51 and m101,with no results.I ve read reports that m51 is a quite bright and obvious galaxy .If so,why cant i see it? Also,can anybody give me advice as to what to observe in and near ursa major?I ve made my own star charts for M81 M82 and M64 and now need more to further advance my Views of the messier objects.Thanks
I am going to buy my first telescope and I can't make up my mind with the focal ratio. I have seen this two option within my budget
Skywatcher 130/1000 eq2 with a f/7.7 ratio
Meade 130 Polaris EQ with 650 mm focal length and f/5 ratio.
I read that a f/7.7 would be better to watch planets while f/5 would be better to watch galaxies and nebulae and will also give a brighter image.
As I am new and never looked through a telescope like those I don't know which to choose. The idea of looking at galaxies really excited me but I also wanted to see planets such as Jupiter or Saturn and it's moons, and at the moment I am not considering photography as I still need to get familiar with the telescope but in the future I would love to take some photos so brightness could be important.
My question is how much difference would I noticed between these two focal ratio when I looked at planets and galaxies. Would I get a much better view of Saturn with a f/7.7 or not really?
Thanks in advance for your advices
Work in progress
Started this Saturday night. I love these galaxies and been wanting to image them a long time.
So far, only 30 x 60s L and 10 x 60s RGB.
C11 with focal reducer (1760mm), ASI183mm Pro. Astrodon filters. Mesu 200. Pixinsight.
Thanks for looking