The Energon Pub

News Credits: 5 · by **Mr O** » Sun Nov 23, 2008 1:53 pm

Bric-a-brac mammals, patchwork outcasts, stickleback ballbags, sightings, people like me, sniper rifles....

(etc)

News Credits: 1 · by **oddsey** » Sun Nov 23, 2008 1:58 pm

Electron wrote:
Tekka wrote:Pants.

yeh alrite, okay guys parties over tekka wants us to put our pants on

You mean get into our own pants? :-(

Electron wrote:
oddsey wrote:Bunnies.
We definitely need more Rabbits.

like hugh hefner playboy bunnies? yes please i would easily welcome that to the thread

Kinda.

News Credits: 8 · by **Electron** » Sun Nov 23, 2008 2:36 pm

Tekka wrote:Pants.... Pants.... Sing the praises of Pants.

They're always warm around my gut, they always cover up my butt.

Pants.... Pants....

ah we could release this as a christmas single? we'll beat all the other threads

by **ThunderThruster** » Sun Nov 23, 2008 2:46 pm

" a british tar is a soaring soul, as free as a mountian bird
his energetic fists should be ready to resist, a dictatorialy word"

News Credits: 5 · by **Mr O** » Sun Nov 23, 2008 3:01 pm

I'm glad I don't know what's happening and I thought you needed to know that.

News Credits: 6 · by **City Commander** » Sun Nov 23, 2008 4:43 pm

WOOO! I've done 2 and a half pages of my optics assignment. Just need to finish writing about astigmatic and comatic aberrations and explain why mirrors are used in telescopes as opposed to lenses, and I can partay like it's 1871! =D =D =D

Pants are for the weak!

News Credits: 1 · by **oddsey** » Sun Nov 23, 2008 4:56 pm

City Commander wrote:WOOO! I've done 2 and a half pages of my optics assignment. Just need to finish writing about astigmatic and comatic aberrations and explain why mirrors are used in telescopes as opposed to lenses, and I can partay like it's 1871! =D =D =D

Pants are for the weak!

I only usually wear them for a few days myself.

:roll:

News Credits: 2 · by **Tekka** » Sun Nov 23, 2008 5:02 pm

Testicle crushing sperm killing pants of doom.

News Credits: 8 · by **Electron** » Sun Nov 23, 2008 5:03 pm

Tekka wrote:Testicle crushing sperm killing pants of doom.

oh u got them to tekka? two for one at marks and sparks?

News Credits: 1 · by **oddsey** » Sun Nov 23, 2008 8:16 pm

Electron wrote:
Tekka wrote:Testicle crushing sperm killing pants of doom.

oh u got them to tekka? two for one at marks and sparks?

I thought he was more of a S&M than M&S kinda guy.

News Credits: 2 · by **Tekka** » Sun Nov 23, 2008 8:21 pm

A little bit from column A, a little bit from column B.

by **The Chronic** » Sun Nov 23, 2008 9:26 pm

How about a Sacalphunt guys? We could join up as a team and/or compete amongst our selfs

Whadaya think, first outing for the ODB HMW Mega-Alliance?

News Credits: 6 · by **City Commander** » Sun Nov 23, 2008 9:45 pm

Only if you help me finish my homework.

(i) Explain what is meant by the dispersion of an optical glass. Hence discuss briefly the occurrence of chromatic aberration in a lens.

(ii) Give an account of the five primary monochromatic aberrations (Seidel aberrations) of simple lenses and spherical mirrors. Support your answer with suitable diagrams that help explain the nature of each of these aberrations.

---this bit here---(iii) In the light of your answers to (i) and (ii), and any other factors you consider relevant, explain why large astronomical telescopes use reflecting optics (i.e. mirrors) rather than refracting optics (i.e. lenses).

Well? Chop chop!

by **The Chronic** » Sun Nov 23, 2008 9:54 pm

errrr...

News Credits: 6 · by **City Commander** » Sun Nov 23, 2008 10:20 pm

*sigh* Too slow. I've blazed out eight reasons for reflecting telescopes as bullet points. I shall now spend the next four hours slowly making them into one big paragraph, then to uni at 7am to print in the library and draw my annotated diagrams.

Then for two hours of lectures, and then to the ice rink to learn to skate for the next three hours, then back for my 4:15 properties of matter lecture, and then home for food, booze, and maths questions.

Let's see any other lazy sod do all that in one day! :smug:

But yes, so you know, here are my points.
I think two may overlap, but eh it'll do.

*******************
A short focal ratio can be more easily obtained, leading to a wider field of view.

Exotic glasses are not needed, as no light passes through the
objective.

The objective has only one surface that needs to be figured, so fabrication is far simpler.

Reflective telescopes are less expensive for any given aperture than reflecting telescopes of similar quality.

There are no lenses to cause chromatic aberrations.

The focusing lens is a parabola, and as such spherical aberration is not a problem.

The use of a perpendicular eyepiece combined with short f-ratios allows for a shorter, more compact mounting system- making it
cheaper and increasing portability.

Comatic aberration is only a problem in systems with a focal ratio of f/4 or less. So for large astronomical telescopes, the effect of comatic aberration is truly negligible.

******************

I still need to say something about astigmatism aberrations though, but not sure what. They're essentially comatic aberrations in two planes..... :-?

Also, I need to say that refractive telescopes suffer from the opposite of all the above

by **The Chronic** » Sun Nov 23, 2008 10:27 pm

Yep, thats what I was gonna say

News Credits: 6 · by **City Commander** » Sun Nov 23, 2008 10:38 pm

I figured

And since it is now done, I get the next 3 hours to play around! =D
I would go downstairs and hang with that gal I'm down with now, but she's probably asleep.

Crazy, you'd think it's late or something! 8D

Still no word from Xybertoys. I'm hoping to come back from university on wednesday to find Henkei Ironhide sat on my desk, but we'll have to see.
Which reminds me, I must also call citylink tomorrow to sort out resending my metal muff...
Scunthorpe is just too far for a poor student like me to go

by **The Chronic** » Sun Nov 23, 2008 10:46 pm

If I had to get up a 7 I probbibly wouldent sleep eather

she's probably asleep.

News Credits: 5 · by **Mr O** » Sun Nov 23, 2008 10:50 pm

I had to wake up to this?

News Credits: 6 · by **City Commander** » Sun Nov 23, 2008 11:03 pm

It's not so much that, it's just that if I go to sleep I'll sleep til middday, and totally miss the assignment hand-in.
I sleep like a rock ya see

I can sleep when it's all done...

Mr O-- It ain't all spam and underpants young man

chronic wrote:If I had to get up a 7 I probbibly wouldent sleep eather
she's probably asleep.

Dude! :O

She locks her door

News Credits: 5 · by **Mr O** » Sun Nov 23, 2008 11:24 pm

I don't recall any underpants.

Saw Blitzwing earlier, looks just as bad in real life. And don't 'young man' me, I'm getting on

.

News Credits: 6 · by **City Commander** » Sun Nov 23, 2008 11:38 pm

Ani Blitzwing? He's friggin awesome! =O

I'm getting on too.

Getting on da bus! 8D

News Credits: 5 · by **Mr O** » Sun Nov 23, 2008 11:44 pm

I must admit I've a bit of a duality about Blitzwing (no pun). One of my childhood favourites but something about the Animated version is putting me off. Just doesn't justify the price in my view (no pun

).