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# A new way to look at aperture

51 replies to this topic

### #1 MikeBOKC

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Posted 01 March 2013 - 07:46 PM

So like most here I have suffered from aperturitis at times. One possible treatment is to look at our available aperture in total . . . so I grabbed the calculator and found that I have in my garage a grand total of 33 inches of aperture! Now if they just made a quinto-viewer . . .

What's your total aperture? See, it can be reassuring!

### #2 Doc Willie

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Posted 01 March 2013 - 08:54 PM

Is that square inches? If not, this is a flawed way to sum aperture. Five 2 inches do not equal one 10 inch diameter.

### #3 Goodchild

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Posted 01 March 2013 - 11:17 PM

Sure it does. We're talking about aperture, not area. Besides, the OP is trying (I assume) to introduce a somewhat lighthearted thread to determine how many scopes/optics one has.

37 for me.

### #4 korborh

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Posted 01 March 2013 - 11:35 PM

19 ... still a teenager

### #5 cheapersleeper

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Posted 02 March 2013 - 02:16 AM

36!!!

### #6 GlennLeDrew

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Posted 02 March 2013 - 02:20 AM

2 * 2" + 2 * 2.4" + 2 * 4" = 16.8".

They might be midgets, but at least binoculars automatically double up!

### #7 Jon Isaacs

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Posted 02 March 2013 - 06:34 AM

An interesting way to look at things. A rough calculation is 130 inches of aperture and somewhere around 24 scopes, some quite large, most small.

Binoculars not included.

Jon

### #8 Startraffic

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Posted 02 March 2013 - 07:11 AM

Hmmm,
14.5"Folded Newt+10"SNT+8"Newt+6"Newt+6"RC+3.54"(90mmETX)Cat+6"Acro=54.54"

Clear Dark Skies
Startraffic
39.138274 -77.168898

### #9 City Kid

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Posted 02 March 2013 - 07:21 AM

970.85mm. Or in inches that would be 38.2" but it sounds more impressive in mm.

### #10 Ed D

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Posted 02 March 2013 - 07:53 AM

I thought this might be interesting so I added up the aperture of my current scopes.
WOW, was it depressing!
So, I added the aperture of the Dob I'm currently building.
Guess what? Now I'm really depressed.

Not really, I'm actually very happy with what I have. But so far I take the prize for least total aperture.

Ed D

### #11 ahopp

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Posted 02 March 2013 - 08:02 AM

1013.71(39.91") includes my L glass canon lenses, they cost more than a good APO so I'm count'n 'm.

Tony

### #12 starrancher

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Posted 02 March 2013 - 08:29 AM

I thought this might be interesting so I added up the aperture of my current scopes.
WOW, was it depressing!
So, I added the aperture of the Dob I'm currently building.
Guess what? Now I'm really depressed.

Not really, I'm actually very happy with what I have. But so far I take the prize for least total aperture.

Ed D

So ,.... What's the total Ed ?

### #13 starrancher

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Posted 02 March 2013 - 08:45 AM

AR5 = 5"
SN8 = 8"
11TE= 4.5"
7T = 2.4"
66TE= 2"
Total = 21.9"

Modest yes , but with the awesome rural northern Arizona skies , it's unreal what an 8" scope will pull .

Oh , I forgot my 10x50s . That adds another 4" !
So I guess that kicks me up to a grand total of 25.9" .

### #14 Martin Lyons

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Posted 02 March 2013 - 08:49 AM

Roughly, 52"

Oops forgot the 16" GSO and the 12" Cass. :o

Make that 80"

### #15 starrancher

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Posted 02 March 2013 - 08:52 AM

Do you have a pict of that folded Newt John ?

### #16 rathbaster

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Posted 02 March 2013 - 09:09 AM

20" in four scopes.
I never realized....

### #17 MikeBOKC

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Posted 02 March 2013 - 09:26 AM

Yes folks this is strictly for fun . . . just thought it might be a hoot sometime in conversation to say "16 inch Dob? That's nothing! I got 33 inches of aperture at home!"

### #18 catboat

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Posted 02 March 2013 - 12:33 PM

It's a bit embarrassing. If I include unmounted optics… 127"

### #19 Mark Costello

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Posted 02 March 2013 - 01:26 PM

I'm happy right now with the job my 5" aperture is doing for me...

Again, not counting binoculars....

### #20 zjc26138

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Posted 02 March 2013 - 01:34 PM

15" of usable aperture for me.

If you count my TMB and AR5, both cells are currently out of their tubes,then I have 25" of aperture.

### #21 JayinUT

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Posted 02 March 2013 - 02:30 PM

28 inches with 4 scope.

### #22 EFT

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Posted 02 March 2013 - 03:04 PM

About 79" with 13 scopes. Woof. More than I thought and I keep remembering one more every time I think I have them all. Probably time to thin that down a bit.

### #23 George N

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Posted 02 March 2013 - 04:03 PM

If I add up the total aperture that I can actually *use* under my endlessly cloudy and snowy skies, the answer is zero! ….at least lately.

### #24 coopman

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Posted 02 March 2013 - 04:18 PM

41.7 inches from my 7 scopes.

### #25 GeneT

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Posted 02 March 2013 - 06:04 PM

Since the human pupil has a focal length of 17 mm, it is f/2.4 and yields 0.17 per mm of aperture. About 2.5 mm is
the photopic (light-adapted) diameter of the eye. I own a 12.5 inch (if I figured correctly, about 318mm) , F5 telescope. That's a lot of eyeballs.

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