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How big does (commercially made) aperture goes?

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#51 Jon Isaacs

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Posted 30 June 2025 - 11:25 PM

It's not as bad as it looks in that photo, Jon.  I've been up that ladder a number of times over the years.

 

I observe alone and very often.  That ladder has no railings.  Easy to fall off, you have to hold on with one hand.  A 32 inch F/4 very similar to a 25 inch F/5...  

 

Obsession with ladder 2014.jpg
 
And if you are 30 years old and 6ft 4 in, it's portable.
 
obsession sold 3.jpg
 
Spend real money on the ladder.. 
 
Jon

Edited by Jon Isaacs, 30 June 2025 - 11:28 PM.

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#52 MeridianStarGazer

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Posted 02 July 2025 - 01:41 PM

I tried carrying bricks up onto a roof, using a 7-brick carrier. As I got well above the top, I realized my balance was not trust worthy, at least not while carrying the bricks. If you spend most of your time seated or especially laying down, don't think you won't lose your balance. It is a skill that must be maintained.

#53 Dave Mitsky

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Posted 05 July 2025 - 07:39 PM

 

I observe alone and very often.  That ladder has no railings.  Easy to fall off, you have to hold on with one hand.  A 32 inch F/4 very similar to a 25 inch F/5...  

 

 
 
And if you are 30 years old and 6ft 4 in, it's portable.
 
 
 
Spend real money on the ladder.. 
 
Jon

 

Granted that type of ladder is superior, but I have never seen one at the many star parties that I've attended over the years or at any of the dark sites that I've visited.

The ladders that ASH has for the club's 12.5" Cave Astrola Newtonian and 17" classical Cassegrain should meet with your approval, Jon. wink.gif

Attached Thumbnails

  • Ladder & 12.5-inch Cave Astrola 7-4-25 AM IMG_5451 Resized 875.jpg

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#54 Dave Mitsky

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Posted 05 July 2025 - 07:45 PM

(continued)

Attached Thumbnails

  • Ladder & 17-inch Classical Cassegrain 7-4-25 AM IMG_5479 Processed Resized 875.jpg

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#55 Jon Isaacs

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Posted 06 July 2025 - 11:45 AM

Granted that type of ladder is superior, but I have never seen one at the many star parties that I've attended over the years or at any of the dark sites that I've visited.

The ladders that ASH has for the club's 12.5" Cave Astrola Newtonian and 17" classical Cassegrain should meet with your approval, Jon. wink.gif

 

Dave:  

 

Those appear to be variations on the Cotterman ladder shown with the 25 inch and yes, they meet with my approval. I think railings are very important for an actual ladder.

 

A good ladder is like a dedicated observing chair, it can transform the experience 

 

Jon


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