Jump from 4.75" to 8"

[lw24]

Hi all,

I'm soon to be aquiring a larger, 8" Dobsonian (Skywatcher Skyliner 200p), to replace my 4.75" Short-Tube Refractor.

Apart from the size and weight (),what sort of a difference will the be, and will it be noticeable?

Clear Skies,

Luke

[vegaandarctures]

The image will be a heck of a lot brighter plus you will resolve much more detail in things like planets and DSO's

[dweller25]

DSO's will be a little brighter.

The planets will show more detail.

Chromatic aberration will be a thing of the past.

You will need to collimate.

Cool down will take a bit longer.

[lw24]

Cool down will take a bit longer.

How long do you think it'll take to cool down?

[swamp thing]

Shouldn't worry about that too much.

Just don't start by trying to observe high resolution objects.

Set it up, make a brew, then. By the time you've observed a couple of Galaxies it'll be ample cool enough for any Planets you wish to observe.

Regards Steve

[dweller25]

I always fit active cooling so from a warm house to near freezing takes 30 minutes.....

[lw24]

I have to drive out for about 10 mins to get to my dark sky site. Should I leave it in my cold garage for 30 mins before I leave?

Clear Skies

[dweller25]

I wouldn't bother - just don't put the car heater on and it will start to cool..

[Adz]

As well as all the things these clever people have said above, you will also get beautiful diffraction spikes on bright stars and clusters. Structure in nebulas such as m42 should hopefully take your breath away as well as the shapes of galaxies such as triangulum and andromeda

My thread might be of interest:

http://stargazerslounge.com/member-equipment-reviews/140240-skywatcher-skyliner-200p-unboxing-building-some-add-ons.html

[gdheib0430]

I think someone mentioned before that they usually go with 5min / inch of aperture. So 40 minutes roughly.

[bish]

I've always found that globular clusters seem to show off a jump in aperture the best. Probably just me but it seems that the difference is more apparent than when looking at other DSO's

[John]

I've always found that globular clusters seem to show off a jump in aperture the best. Probably just me but it seems that the difference is more apparent than when looking at other DSO's

Me too.

Globulars look nice in my ED120 but my with 10" newtonian they are starting to look like their photos

[LukeSkywatcher]

I've just gone from a 5" Dob to 8" (go-to) SCT

I can only imagine the difference right now because i have not used the 8".

[faulksy]

i went from a 6" mak to my 9.25 cpc and the difference was like chalk and cheese. big wow factor

[rfdesigner]

I think someone mentioned before that they usually go with 5min / inch of aperture. So 40 minutes roughly.

It depends far more on the thickness of the mirror.

My 12" mirror is 2" thick and that can take a long time to settle.

Take a look at:

Telescope Mirror Cooling Calculator

Derek

[Cjg]

I've just gone from a 5" Dob to 8" (go-to) SCT

I can only imagine the difference right now because i have not used the 8".

Oh man that would be driving me crazy, it's been crazy wet and cloudy here in the North East.

Am sure all of us on here wish you clear skies soon

Chris

[lw24]

Thanks for the advice all, can't wait to get out there with the new scope when I buy it

Clear Skies,

Luke

[perrin6]

Moving up to an 8 incher.

You will notice brighter globulars sprinkled with faint stars instead of just being nebulous.

The great red spot should be an obvious orange oval during good seeing.

Loads more galaxies.