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By Victor Boesen
Since I got interested in astronomy, my dream telescope has always been a ten inch dob. A few days ago I got the skywatcher 250px dob which I bought together with three explore scientific 82 degree eyepieces.
Two days ago I had my first light, but collimation was a tad off. I collimated it the day after, and had even clearer skies.
First of all, I could see more colours in the stars than I could with my old 6 inch reflector. After collimating the scope I could also see spikes on the bright stars, but precise spikes.
I began with star hopping to m81 and m82. For this I used my 24mm 2" eyepiece. This eyepiece is very nice for star hopping. When star hopping, you can clearly identify these galaxies when you see them. Even tho the sky wasn't totally dark I could still see m82 as a long pencil while m81 was more of a blob. when it became darker m81 was more like an elongated disk.
The next target was jupiter since it had just swung into view from my balcony. On stellarium it said that Io would cast its shadow onto the disk, so I wanted to try and see if I could see the shadow. I observed with the 14mm explore scientific at 85x and the cloud bands stood out bright and with loads of contrast. I tried with my 4,7mm but I found that it was a bit too much magnification (255x). I then tried the 14mm with my 2,5x barlow which gave me 214x and this worked out better, but not as good as with the 14mm only. I think the sweet spot for me would be with an 8,8mm eyepiece (added to wishlist).
At one point observing jupiter, the jetstream was very calm so I had a crisp jupiter with a shadow as clear as a black dot on a piece of white paper through the hole field of view.
I found it very easy to nudge the scope from a to b, and when I was on target, the view was crisp and clear even from inner city where I live.
I have never seen jupiter this clear, not even from a rural area with the milky way visible.
Would anybody be able to help suggest good Eye peices for detailed viewing of plants using a FL400 80mm Esprit
Also I have 2X 2inch Barlow
Folks just a short note to share a modification which some of you may find useful.
The standard Crayford has fairly poor focus accuracy as we all know.
But rather than chuck it and buy the twin speed version at about 150 quid... try this first.
Simply double the gearing ratio by reducing the dimaeter of the spindle.
I used a 2.5mm screwdriver and a ball of tape to give me a handle.
The original spindle is abour 5mm
So in stead of 3 full turns to rack end-to-end, you get amnost 6 full turns of the spindle.
here is a fairly crude yet very effective implementation using a precision scredriver.
this has greatly improved my focus accuracy!
...and as a bonus it can how hold my DSLR without applying the focus lock!
Hope you like it and give it a go!
I took delivery of a Skywatcher 200p last night and got it set up ok I think. I got a good view of Jupiter with the 25mm lens but when I put the Barlow lens in I couldn't focus it.
I also tried the 10mm lens but it made everything grey, no real light comes in at all. It came with a thing that might be called a focuser extension, not sure, but it didn't help.
What rookie mistakes am I making?