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Which book should i get?
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By Kronos831
Sooo after coming back from holidays(have been gone for a month and a half) i discovered that i had forgotten to use the lens caps to protect my Panaview 32mm from dust....
turns out, its dirty.Me having no idea what a "multiple element lens eyepiece " meant , learnt the hard way. I unscrewed the bottom part of the eyepiece and 2 lenses and a tiny ring came out... not knowing in how to put them in, tried a bunch of different ways, and still the eyepiece view was still bad.(couldnt even focus on daylight objects) after messing with it for a bit 3-5 more lenses came out. Now my 100$ eyepiece is totally screwed up and i have No idea how to fix it. I m panicking so much and i have absolutely no idea what to do. I hope i ddnt screw the lens up...
if anyone thinks they can help me, i m gonna make a system in which you can tell me how to put the lenses back
So lets name the first group of parts depending on their place from left to right : A(The first lens ), B(the ring) and C( The Thrid lens) , now, these i have no idea how to place them correctly (have in mind that A Is curved , if it gives you any information)
The next 4 pieces you see are D(The thick ring), E(The big lens) F (the other ring) and G(the final lens)
Here is a picture of each piece from both up side and bottom side
First will be up and second would be down
If anyone could give me instructions to as how i can put everything back together , i would be greatful
(Uploading pictures in a bit)
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By Yash4astronomy
Hey Everyone. I believe almost everyone of us would be aware about the Bootes Void. If not then I'll explain. Bootes Void is a point in universe of massive volume and almost completely empty space. It's about 750 million light years from us and stretches for about a billion of light years. It definitely is huge but is also just that empty because such large space only contains about sixty galaxies.
Now what's special about this place is that it is more mysterious than black holes, even more than primordial black holes. So there definitely are many possibilities and hypothesis, like expansion caused by alien species or merger of two voids. But I've a different speculation, based on my hypothesis, this void is probably the center of expansion of our universe. What if big bang actually took place there?!!! It probably may have....
What makes me think so is that the void is not empty at all, it probably is full of more dark matter in many parts of the universe and also a centre of Dark energy in universe which makes it expand like that.
I guess almost everyone of us would be knowing of comparison of our universe' expansion with inflation (not the inflation in the beginning of expansion of our universe) of a balloon, then, yes it's true that if we mark any point on the balloon then it would look like it's expanding in every direction and the same is happening with our universe, wherever we observe, we find anything around it to going away from themselves, but we also know that a balloon has the centre of expansion from which we blows in it, similarly universe is also supposed to have an actual point of expansion and it probably is the bootes void!
It is or not?
Thank you.
-Yash Tomar
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By Yash4astronomy
I've just joined the forums. I came here because I wanted to interact with the people with whom I have something in common, make friends and share knowledge with all of them and learn from them. I hope it could work out well, I have also planned to publish a paper that I am preparing on dark matter that is supposed to be completed 6 months later, I'm currently 15 years and have no good friends of me, so I came here.
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By Matty_C
Hello all,
I have just joined and have been looking around, and putting in various searches to find the answer to my question(s).
I have already found some valuable information, but i can't find a specific answer to a question i have relating to exposure times.
I have shot the milky way several times before, from a tripod and a wide angle lens. I am aware of and understand the "500 rule" and that worked fine for me at first when i was shooting with my Canon 6D Mark II. When i moved over to the Sony A7III i noticed significant trailing using the same rule and that led me to the NPF rule (Via the photopills app incase people dot know).
I am heading back to Tenerife once again in about 6 weeks time and want to buy a star tracker so i can get some really detailed images.
I have done a fair bit of research and in principle, the whole thing doesn't seem to be too daunting or difficult.
I have purchased the Polar Scope Align Pro app so i can align Polaris as accurately as possible, i will practise putting the unit together and familiarising myself with the different parts etc, but it is the exposure times that i do not understand.
My best glass is the Carl Ziess 50mm F/1.4 Planar, the 18mm F/2.8 Batis, the Sigma 35mm F/1.4 Art & the IRIX 15mm F/2.4 Blackstone.
I currently do not own, nor have i ever used a tracker, and I cannot find any information relating to which aperture, ISO and Shutter length any of these focal lengths should or could be shot at.
Is there anything similar to the 500 rule or NPF rule that relates to using a tracker with varied focal lengths? or is it just a case of stepping the lens down for sharpness and then trial and error?
Thanks in advance,
Matt.
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