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Please help, what is the difference between these

Hello, I'm looking to purchase a telescope, am brand new to all of this. I have seen this one but found it for two very different prices. Please could someone advise if there is a lot of difference between the two kits and if the one is worth the more premium price tag?

Unfortunately I am unable to copy in the URL's as keep getting error message saying to remove off site URL's as post ...
Read more : Please help, what is the difference between these | Views : 2106 | Replies : 6

flats panel

Will it make a difference if a light blue electroluminescent panel is used instead of white?
Read more : flats panel | Views : 1402 | Replies : 1


Has anyone had any experience using a hyperstar lens on a Schmidt Cassegrain telescope? Are they difficult to use, are the results good? Any information would be gratefully received.
Read more : Hyperstar | Views : 2877 | Replies : 7

The Sun: Why Doesn't It Shrink?

The Sun is supposed to be a giant ball of compressed hydrogen gas. The compression makes it operate as a kind of thermonuclear reactor, continually using up the hydrogen as fuel.

If this is true, the hydrogen in the Sun must be getting "used up" all the time. So shouldn't we see some sign of this, for instance by observing a shrinkage of the Sun? Yet we don't see this. The Sun seems to stay ...
Read more : The Sun: Why Doesn't It Shrink? | Views : 3826 | Replies : 17

Universe too big or too young?

Hi, would be interested to know what explanations astrologers have for the following anomaly- If our universe is estimated to be around 13.8 billion years old (time from big bang to present day), and the size of the observable universe is estimated at 92 billion light years (so its 46 billion light years from the center to the edge) ... and if both those things are true then the average speed of the matter now ...
Read more : Universe too big or too young? | Views : 2121 | Replies : 3

Dark Matter Black Holes?

On the basis that Dark Matter exhibits the property of mass is there a theoretical possibility that dark matter could therefore ultimately form a Singularity and if so how might this present itself?

Read more : Dark Matter Black Holes? | Views : 2597 | Replies : 6

Expansion speeding up

Could the increasing rate of expansion of the universe be explained by either the universe slowing down at an increasing rate from the outside in or similarly could it actually be imploding at increasing rate from the outside in. Has it actually been proven that everything is moving away from each other?
Read more : Expansion speeding up | Views : 5211 | Replies : 41

standard candles and donor chemistry

As I understand standard candles they are binary stars where the dying partner is stealing mass, when it hits (always the same) critical mass it explode - same mass = same brightness...

...but what of the donor chemistry, could that not effect the "colour" of the light or even the temperature of the explosion? Would that then not effect the distance measurement because the brightness would be even slightly be effected ?

On a slightly ...
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Recently bought a 2nd hand Skywatcher 90 1250 Cassegrain (IIRC!). I knew the red dot finder didn't work - the former keeper tried changing batteries to no avail. Should I try a direct replacement (if yes any recommendations?) or should I consider something like a Seben 5x24 FS1?
Read more : Replacement | Views : 2425 | Replies : 6

Photographing the Sun Using DSLR Photographing the Sun Using DSLR

Hello All,

I'm new here and new to photographty. Eventually I'd like to do some astro photography but for now I'm sticking to DSLRs.

I'd like to know where I can buy a screw-in filter for taking images of the Sun. Is there anything available in the market.

I've searched the internet and found Thousand Oaks but I think they only do filters for telescopes.

If anyone has suggestions kindly let me know.

Read more : Photographing the Sun Using DSLR | Views : 2239 | Replies : 3


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