Dew Shield Contrast Improvement
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By GiL Young
Hello all. Thank you for taking a moment to read this & offer your suggestions/ advice. I'm sure my basic question has been asked many times: "In your opinion or experience, what are the first, most important, necessary accessories I should add in order to maximize the the use and ease of a newly acquired Celestron Nexstar 127 SLT ? I have a power supply adapter, 9mm,10mm, 25mm eyepieces, 2x Barlow and 90 degree diagonal mirror adaptor. With a modest budget and a 2 week deadline, I've researched numerous reviews and narrowed some choices to additional Plossl eyepieces, an assortment of filters or a dew shield. All of and these can probably be purchased within my budget but I'm even willing to take the plunge on an upgrade to a better mount, which I have no idea where to start. Any and all suggestions, advice and opinions are gladly appreciated. Thank you all, from across the pond in northeastern US.
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By Lee_P
Lots of astro kit for sale! Payment via bank transfer or PayPal (buyer to pay fees). Reasonable offers considered.
1. Sky-Watcher Evostar 80ED DS-Pro Outfit with auto focuser upgrade -- £350
Comes with diagonal, 28mm 2” eyepiece, 2" to 1.25" eyepiece adapter, dovetail, tube rings, SkyWatcher Auto Focuser, HitecAstro DC Focus Controller USB, metal case. Approx. cost new: £562. Buyer to collect from central Bristol, or buyer to arrange for a courier. Note: doesn’t come with a finder / guider, but I have some available (listed below).
Main items similar to:
https://www.firstlightoptics.com/pro-series/skywatcher-evostar-80ed-ds-pro-outfit.html
https://www.harrisontelescopes.co.uk/acatalog/skywatcher-auto-focuser.html
http://ensoptical.co.uk/hitecastro-dc-focus-controller-usb
2. Sky-Watcher .85x Reducer/Flattener for ED80 -- £120 inc. recorded delivery to mainland UK
https://www.firstlightoptics.com/pro-series/skywatcher-85x-reducer-flattener-for-ed80.html
3. Sky-Watcher Skymax 150 PRO -- £300
Comes with diagonal, 28mm 2” eyepiece, and dovetail. Note: doesn’t come with a finder / guider, but I have some available (listed below). Buyer to collect from central Bristol, or buyer can arrange for a courier.
It's an earlier version of this: https://www.firstlightoptics.com/maksutov/skywatcher-skymax-150-pro.html
Works well with items 7, 8, and 9.
4. Sky-Watcher 9x50 and QHY5 mono guidescope -- £150 inc. recorded delivery to mainland UK
Includes T thread adapter attaching the QHY5 to the finderscope. Also includes kit to convert into a regular optical finderscope.
5. Sky-Watcher 9x50 Finderscope -- £30 inc. delivery to mainland UK
https://www.firstlightoptics.com/finders/skywatcher-9x50-finderscope.html
6. Sky-Watcher EQ3 PRO mount -- £220
In pretty good condition, and includes the handset for full goto functionality. Unboxed. Buyer to collect from central Bristol, or buyer can arrange for a courier.
It's an earlier version of this: https://www.firstlightoptics.com/skywatcher-mounts/skywatcher-eq3-pro-synscan-goto.html
7. Astrozap Dew Heater Tape, 6" 'scope -- £30 inc. delivery to mainland UK
https://www.firstlightoptics.com/dew-prevention/astrozap-dew-heater-tapes.html
8. Astrozap Flexible Dew Shield for Skymax 150 -- £20 inc. delivery to mainland UK
https://www.firstlightoptics.com/dew-prevention/astrozap-flexible-dew-shield.html
9. StarSharp Bahtinov Focus Mask 150mm Maksutov -- £10 inc. delivery to mainland UK
https://www.firstlightoptics.com/bahtinov-focus-masks/starsharp-bahtinov-focus-masks.html
Items 1 and 4:
Item 2:
Items 3, 5, 7:
Item 5:
Item 6:
Item 8:
Item 9:
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By alanjgreen
1. DEW SHIELD
I've completed a pair of dew shields for my 16x70 binos. I used a 10mm thickness Mountain Warehouse camping mat paired to some 50mm Valcro with additional strong glue to keep them stuck together.
For the first one, I used the full 50mm overlap on the Velcro to hold the ends together but they were quite hard to pull apart. So, for the second one, I used 50mm on one side of the Velcro and cut-down to 25mm on the other side of the Velcro.
Time will tell which is the best solution, then I can make up a "third one" to be the same as the best of the other two - if needed!
2. FILTER HOLDERS
My APM binos have 20mm of eye relief so I hope to make some filter holders from some of this matting.
I have some spare old 2" Skywatcher UHC and O3 filters in the loft, so I plan to experiment to see if I can construct something from the camping mat to fit them over the eyepieces of the binos.
After removing the rubber eyecups, I am left with a 2" diameter eyepiece which matches the circumference of these 2" filters.
So, I am making a 40mm wide & 210mm long camping mat "roll" that will fit exactly around the eyepiece. The ends wont overlap, they should just meet up and i will wrap the whole thing with Gorilla Tape to hold it "in a circle". This circle should then just push down over the eyepiece to hold the filters in place.
I will use some folded over gorilla tape segments to make a "rim" that the filter will "sit on" ( at a distance of 10mm from the top ) when pushed inside.
As the 2" filter is way more than the 30mm of the bino eyepiece lens, then as long as I dont block the central 30mm of the filter, the view should be unobstructed.
The glue is setting at the moment, if successful then I will post up some pics... (Blue Peter would be proud!)
Alan
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By beka
Hi All,
I wanted to ask if anyone has the experience of using a GSO Crayford or similar focuser or on a CPC 1100, and if a counterweight was needed to balance the OTA. I want to use it with a DSLR as well as 2" diagonal.
Cheers
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By umasscrew39
I just setup my CPC 1100 Edge HD scope with the Celestron heavy duty wedge and I want to do AP. The tripod is on a JMI wheeler bar and I put vibration pads under the wheels. The setup is on my deck on top of the main bean as I do not have a good spot on solid ground. The scope is a little shakier than without the wedge but not horrible. So, based on others experience:
1. Will this work for both short and long exposure AP or do I need a eq mount? Or, does that not matter since I can only use it on my deck and not solid ground?
2. By chance, has anyone used this setup with Starsense to align?
Thanks in advance for any help/suggestions.
Bruce
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