Telescope Reviews: Aperture comparison sketches

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Astrophotography and Sketching >> Sketching

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matman-1
member

Reged: 12/15/08

Loc: Northern Sweden

Aperture comparison sketches
#3323898 - 09/09/09 11:12 AM

I’m not sure this is the right forum for this kind of question but I give it a try. I’m am very curious of visual comparison of different aperture. For example sketch of a galaxy/cluster in 4 inch, 6inch, 12 inch newt. There is the classical comparison of M13 on obsessions website but them being a vendor not sure how much truth it is in it.

appreciate any answer, tips, links.

Clear skies to you all!

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Jeremy Perez
Carpal Tunnel

Reged: 08/12/04

Loc: Flagstaff, Arizona, USA

Re: Aperture comparison sketches new

[Re: matman-1]
#3323914 - 09/09/09 11:21 AM

Hi matman, if you go to the Deep Sky Archive, you can search for an object, such as "Messier 13" or "NGC 7331", etc., and see sketches from contributors using a variety of telescopes/binoculars/naked eye. The only problem will be that different sketching styles, observing skills, and viewing conditions may have as great an effect on what the sketch shows as the aperture does. Still, it is very informative of what is possible given a particular scope and definitely fascinating to see what other observers discern.

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rolandlinda3
Post Laureate

Reged: 01/24/06

Loc: Crozet VA 22932

Re: Aperture comparison sketches new

[Re: matman-1]
#3323953 - 09/09/09 11:44 AM

I have sketched several objects to compare apertures if that is any help. You can peruse the gallery listed on the signature. Go to the Eagle Series to see the most recent comparison with eps as well as astro video.

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matman-1
member

Reged: 12/15/08

Loc: Northern Sweden

Re: Aperture comparison sketches new

[Re: rolandlinda3]
#3325636 - 09/10/09 09:21 AM

spent the last half hour gazing at sketches at the deep sky archive, excelent stuff, thanks Jeremy. could quite find the eagle series on your link there roland, but I keep looking, once again thanks for your links.

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TenthEnemy
scholastic sledgehammer

Reged: 01/21/08

Loc: Maryland

Re: Aperture comparison sketches new

[Re: matman-1]
#3326470 - 09/10/09 05:19 PM

I like the idea of sketching the same object in different apertures in the same night for comparison. I've never done this because the jump would be from 80mm to 10 inches which seems a little ridiculous without something in the middle.

I could make a comparison between a 60mm and 80mm but that hardly seems interesting.

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rolandlinda3
Post Laureate

Reged: 01/24/06

Loc: Crozet VA 22932

Re: Aperture comparison sketches new

[Re: matman-1]
#3326827 - 09/10/09 08:32 PM

sorry.... here it is.

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JakeSaloranta
scholastic sledgehammer

Reged: 09/18/08

Loc: Sisu Sauna Sibelius

Re: Aperture comparison sketches new

[Re: TenthEnemy]
#3327255 - 09/11/09 01:56 AM

Years ago when I was still a novice I wrote an illustrated article about the differences of 4" and 8" telescopes when viewing deep sky objects. I can see if I can find the comparison sketches from my hard drive.

I have hundreds of objects sketched with 3" and 8" but they are hardly comparable (often using the 3" under very dark skies and 8" under suburban skies).

The only real thing that comes to mind (not directly related to aperture but gives a so-so demonstration) is visibility of M42 with 3" refractor and UHC filter:

http://www.kolumbus.fi/jaakko.saloranta/Deepsky/UHC/UHC.html

/Jake

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JakeSaloranta
scholastic sledgehammer

Reged: 09/18/08

Loc: Sisu Sauna Sibelius

Re: Aperture comparison sketches new

[Re: JakeSaloranta]
#3327272 - 09/11/09 02:13 AM

Here are a few rough comparisons (don't take them too seriously)

Messier 27 with 3" refractor and 8" reflector

Messier 67 with 4" reflector and 8" reflector

Messier 57 with 8" reflector and 12" reflector

Messier 51 with 3" refractor and 8" reflector

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Dr Morbius
Post Laureate

Reged: 02/06/07

Loc: ManorvilleNY-but not for long

Re: Aperture comparison sketches new

[Re: JakeSaloranta]
#3328953 - 09/11/09 11:18 PM

Nicely done sketches, Jake! Really gives a good impression of what you see with different apertures.

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phxbird
sage

Reged: 12/24/07

Loc: New Mexico, USA

Re: Aperture comparison sketches new

[Re: Dr Morbius]
#3329446 - 09/12/09 09:36 AM

It is interesting! The M57 sketches reveal something kind of cool though it is in a different field than sketching. The view with the 12" reflector is virtually the same as with my 6" refractor and a CCD camera using a 45 second exposure! I have used a technique where I take an image with CCD and then sketch it from the monitor. It is definitely not for science but for aesthetics!

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Reverie
sage

Reged: 03/27/08

Loc: Somewhere far far away

Re: Aperture comparison sketches new

[Re: matman-1]
#3357455 - 09/26/09 08:42 AM

Some Jupiter sketches
http://alpo-j.asahikawa-med.ac.jp/publications/TGA/2005-04sp.htm#Section4

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joelimite
Carpal Tunnel

Reged: 09/01/08

Loc: Fayetteville, AR

Re: Aperture comparison sketches new

[Re: Reverie]
#3358150 - 09/26/09 03:52 PM

Jake, those aperture comparison sketches are great. Now you've got me scheming for a 12" reflector so that I can see the center star in M57

Personally, I would love to see some galaxy sketches from a 16" or larger scope. I've tried searching the forum, but didn't have much luck. Anyone know of any?

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JakeSaloranta
scholastic sledgehammer

Reged: 09/18/08

Loc: Sisu Sauna Sibelius

Re: Aperture comparison sketches new

[Re: joelimite]
#3359122 - 09/27/09 03:37 AM

Quote:

Personally, I would love to see some galaxy sketches from a 16" or larger scope. I've tried searching the forum, but didn't have much luck. Anyone know of any?

Try deep sky sketches by Iiro Sairanen: Iiro's DeepSky Sketches

He has hundreds of most excellent deep sky sketches made with 16", 18" and larger telescopes.

/Jake

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CarlosEH
Postmaster

Reged: 01/19/05

Loc: Pembroke Pines, Broward County...

Re: Aperture comparison sketches new

[Re: JakeSaloranta]
#3359269 - 09/27/09 08:20 AM

Aperture will always win in the visibility of astronomical objects (e.g. resolution) assuming diffraction-limited optics, collimation, and the atmosphere (seeing). This does not imply that a small aperture instrument cannot provide excellent views of the heavens. This forum has had posted many excellent observations made using small aperture instruments in the past and present. Jay's excellent observations of DSO's made using a 3" refractor and an 8" reflector display the advantage of aperture. We all suffer from aperture fever, but the bottom line is to use the instrument at your disposal to it's fullest potential.

Carlos

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John K
Carpal Tunnel

Reged: 12/26/05

Loc: Vernon BC Canada

Re: Aperture comparison sketches new

[Re: CarlosEH]
#3359538 - 09/27/09 11:49 AM Attachment (80 downloads)

I just recently posted a ngc galaxy sketch.It is labeled Ngc 891.Here it is this was in mag 6.7 skys I used a 15" dob and a 13mm Ethos Mag=140X

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joelimite
Carpal Tunnel

Reged: 09/01/08

Loc: Fayetteville, AR

Re: Aperture comparison sketches new

[Re: John K]
#3359603 - 09/27/09 12:28 PM

That's a stunning sketch, John. And Jake, thanks for the link. There are a lot of great sketches there that definitely prove, for galaxies at least, that aperture rules. Someday, when I've got a vehicle to tow the thing, I plan on getting a giant Dob so that I can enjoy similar views myself.

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Jeff Young
Post Laureate

Reged: 08/04/05

Loc: Ireland

Re: Aperture comparison sketches new

[Re: joelimite]
#3360167 - 09/27/09 05:45 PM

Quote:

Personally, I would love to see some galaxy sketches from a 16" or larger scope. I've tried searching the forum, but didn't have much luck. Anyone know of any?

More at http://www.rokeby.ie/observatory/pages/sketches.html

Cheers,
-- Jeff.

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joelimite
Carpal Tunnel

Reged: 09/01/08

Loc: Fayetteville, AR

Re: Aperture comparison sketches new

[Re: Jeff Young]
#3360259 - 09/27/09 06:46 PM

Those are beautiful sketches, Jeff. Thanks for the post and for the link. M33 in your 16" really puts the faint gray blob I see in my 8" to shame.

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HellsKitchen
Pooh-Bah

Reged: 09/05/08

Loc: Melbourne Australia

Re: Aperture comparison sketches new

[Re: joelimite]
#3360777 - 09/27/09 11:28 PM

Great Sketches Jeff! I saw the dust lane in NGC 3628 with my 12" back a year ago but missed out on it this year due to constant cloud and smoke haze.

Edited by HellsKitchen (09/27/09 11:29 PM)

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TenthEnemy
scholastic sledgehammer

Reged: 01/21/08

Loc: Maryland

Re: Aperture comparison sketches new

[Re: HellsKitchen]
#3361056 - 09/28/09 03:14 AM Attachment (81 downloads)

Here's M27, It was a lot of fun doing this sketch, so expect more like it in the future.

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