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Everything posted by johninderby
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Question Regarding Gravity
johninderby replied to Sunshine's topic in Physics, Space Science and Theories
Yes there seems to be a new theory every day but no real answers. I’m off to investigate the theory of the best biscuit for dunking. 😁 -
It’s hard to overcome urban myths such as increased lighting reduces crime.
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- part-night lighting
- light pollution
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Question Regarding Gravity
johninderby replied to Sunshine's topic in Physics, Space Science and Theories
So many different theories. 🤔. Try searching for Dark Gravity (emergent gravity) -
Question Regarding Gravity
johninderby replied to Sunshine's topic in Physics, Space Science and Theories
There was a paper called “Could Dark Energy be a Manifestation of Gravity?“ How they are actually related is simply unkown with plenty of different opinions. One theory is that they are opposing forces. -
Question Regarding Gravity
johninderby replied to Sunshine's topic in Physics, Space Science and Theories
Some physicists believe gravity is tied in with dark energy so once we understand what dark energy is we will understand gravity. Or more likely when and if we discover what dark energy is we’ll have a whole new set of mysteries to solve. Then there is the dark energy vs dark matter argument of course. -
Last few questions - about to order 200P
johninderby replied to Deisler's topic in Getting Started Equipment Help and Advice
Good news. 👍🏻 You do know you’re not allowed to leave it stock don’t you. 😁 Dobs and modding go together. 🙂 -
I’ve used twin wheel locking castors and while there is no up and down movement the wheels can swivel a little bit due to play in the locking mechanism. The only castors that do not move at all are the leveling types that let you raise the castors off the ground and the weight is then supported on rubber feet. Not cheap though. https://www.bearingboys.co.uk/Levelling-Castors-3783-c My old Blue Whale used them.
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This place is where I buy my castors. Huge selection. https://www.bearingboys.co.uk/Castors-1085-c
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Bought the Observers Book of Astronomy a few months ago to replace the one that had gone missing years ago. 🙂 Better than your old Tasco but probably about as usefull. 😁 https://www.ebay.co.uk/itm/Tasco-Refracting-Telescope-Model-6TR-S-Hospiscare/383239096530?hash=item593ad488d2:g:e2YAAOSwnCtduERW
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Unscrew the inner ring on one side of the filter and you will find two filter elements stacked together inside..Note there are a couple of tiny slots on the inner ring that you can use to unsrew it using a tiny screwdriver. There is a pic of this in the thread I linked to but here it is again. Please also note the OP of the thread I linked to asked TS about it and they confirmed there was an ND filter. Did you ask if there was a seperate ND filter which there isn’t as it is a combined filter.
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Last few questions - about to order 200P
johninderby replied to Deisler's topic in Getting Started Equipment Help and Advice
Did a bit more looking around and found it a bit cheaper at FLO. Astroshop - £40.80 incl shipping FLO - £40.95 incl shipping -
Last few questions - about to order 200P
johninderby replied to Deisler's topic in Getting Started Equipment Help and Advice
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Last few questions - about to order 200P
johninderby replied to Deisler's topic in Getting Started Equipment Help and Advice
The astroshop Omegon Radian finders are about £3.00 or £4.00 cheaper including postage compared to ordering a Telrad from the UK. -
Bit like those old fashioned thread sizes Americans use instead of proper metric stuff. 😁
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Doesn’t get that cold in the UK very often. Around here we might get an inch of snow once or twice during the winter or sometimes none at all.
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Last few questions - about to order 200P
johninderby replied to Deisler's topic in Getting Started Equipment Help and Advice
No problem. A budget is a budget and better the 200p now and get some use out of it. There are a lot of mods you can do to it to improve the performance. Look for bearing mods as this is a simple thing that can make the scope nicer to use. Improving the AZ bearing involves nothing more than the plastic from a milk bottle. -
Last few questions - about to order 200P
johninderby replied to Deisler's topic in Getting Started Equipment Help and Advice
The point you are missing with the Bresser is you are getting a lot more than £110.00 worth of upgrades compared to the Skywatcher. The Bresser is a far better buy. I know the differences aren’t obvious to the beginner but you will learn with experience. There are a lot of second hand 200ps around though that can be had quite cheaply but very rarely do the Bressers come on the market as they are a newer design so not as many around. A Skywatcher 9x50 Raci is less than £65.00 and most find the best combination is a Telrad and a Raci finder. The Telrad to get you in the aera and the Raci to zero in. I find the Telrad is the best but the Rigel is a lot smaller and lighter but performs the same basic function. https://www.harrisontelescopes.co.uk/acatalog/skywatcher-9x50-right-angled-erect-image-finder--bracket.html#SID=22 -
Last few questions - about to order 200P
johninderby replied to Deisler's topic in Getting Started Equipment Help and Advice
To complicate things further the Bresser 8”dob while more expensive is far better specced than the Skywatcher and as the tube is mounted using standard tube rings can later be fitted to an EQ mount if you wanted.. Has proper alt and az bearings, a very nice focuser, tube ring mounting so you can move the tube to balance it, proper black coating inside, good mirror cell etc. Already has the upgraded parts you would want to fit to the Skywatcher so proably cheaper in the long run. https://www.harrisontelescopes.co.uk/acatalog/bresser-messier-8--dobsonian-telescope-4716420.html