Quote:
Originally Posted by Wavytone
1. 180 degrees, naked eye, lying on the ground looking up.
2. 3.8 degrees, mainly for locating objects and rich-field views of Milky Way
3. 1 degree, DSO's.
4. 0.2 degrees, high power (planets)
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Excellent. That's the sort of thing I was after.
Quote:
Originally Posted by mental4astro
Hi troypiggo,
I believe I see where you are coming from, but I don't see just how relevant the "wide field view" is when if your scope is a 8" f/15 mak and another's is an 8" f/4. Using the same EP will produce very different results.
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Exactly. That's why I'm not asking about a particular EP, I'm asking about the fields of view.
Quote:
Originally Posted by mental4astro
I love my 17.5" f/4.5 dobbie, and I mainly use a cheapie 68* EP. My favourite wide view scope, though, is my new 8" f/4 newt. coupled with a 30 year old 28mm RKE eyepiece with its modest 50* FOV. I can interchange these two eyepieces, but they work very differently in each scope.
Would a more expensive Wide Field of View eyepiece make a difference to my visual experience? Maybe. But it adds complications to short f/ratio scopes.
That's all I'm getting at- it is a function of EP properties vs. scope and its ratio. I find it hard to make a valid judgement on the value of what would be an actual field size.
To that I also would add that I wouldn't go near an 82* or wider eyepiece. I find them too difficult to use visually. I have human eyes, not those of a falcon, so I'll distinctly limit myself to my physiological limits, not my pocket's.
Should make for even more interesting discussion.
Mental.
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Maybe I'm not being clear. I don't really care what scope or EP you're using. I'm interested in what you actually see when you put your eye to your eyepiece.
Let's break it down. With your 17.5" dob, think about what EP do you find is your favourite and/or most useful. Now, what field of view is that giving you? ie what size objects can you see with it? That's what I'm after.