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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
This is my first shots of Saturn and Jupiter taken the last summer with my new ZWO ASI178MC.
-Sky-Watcher Maksutov-Cassegrain Ø150mm /1800mm
-Sky-Watcher NEQ5 PRO Goto mount
-ZWO ASI178MC camera
-ZWO ADC corrector
-Pierro-Astro electric Focuser Focus v2 controlled by the PC station in ASCOM.
-Imaging Software : FireCapture
-Integration Software : Autostakker 3
-Processing Softwares : PRISM v10 / Registax 6 / PhotoShop CS6 / Lightroom 6
- Wide Gammut Monitor for processing : NEC SpectraView Reference 272 (27") calibrated with x-Rite i1 Display Pro colorimeter
Sequence of 11,000 images.
8,800 added with a sub-exposure of 88ms/image.
Focal length : 1800mm
Sequence of 6,000 images. 4,800 images added.
The exposure time for each image : 40.7ms.
Focal length : 1800mm
After a lot of work and help from the great Damian Peach I managed to get some really good images of Jupiter Mars and Saturn despite a total spend of just £100... and I made another bonkers Astrobiscuit video about it which I hope you enjoy. Mr Peach really helped me pick my nights to image and the other big surprise was how good the canon 600D is at planetary. All comments/ advice/ criticisms most welcome...
GSO 0.20 m
Sky-Watcher NEQ-5 Pro SynScan mount
ASI 120MC + IR/UV Cut filter
GSO barlow lens 5x (APO)
ZWO IR/UV Cut filter
f: 5000 mm
The newton in action! 😀
Matteo Vacca Milis, Italy http://vaccamatteo.weebly.com/ https://www.astrobin.com/users/matteovacca/