Astrophotography forum > Eyepieces Questions & Recommendations

Eye Relief

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scamcackratge:
Hello,

I am new to astronomy and I am adding eyepieces and have a question.  It seems to me that EP's using a longer eye relief are a bit more comfortable to work with.  I do not have to move my attention around as much to view and that I have significantly less blackout.

Are longer eye relief EP's more comfy in general?

Thanks.

coachroninil:

--- Quote ---Hello,

I'm new to astronomy and I am adding eyepieces and have a question. It seems to me that EP's with a longer eye relief are a bit more comfortable to use. I don't have to move my eye around as much to view and I have less blackout.

Are longer eye relief EP's more comfortable in general?

Thanks.


--- End quote ---
There are two answers for this.

1/ Eyeglass wearers appreciate the extra eye relief, especially if they have a condition that cant be corrected by adjusting the focus on the eyepiece.

2/ Personal choice. I love long eye relief, just because I do. Other observers have no such preference. Unless you wear glasses try whatever sounds good and go from there in terms of preference.

David Williams:
I think most find that there's a threshold, the 3 mm of eye relief a 5 mm Plossl provides is almost always too little. And 20 mm is almost always enough. Somewhere between those two, is the threshold between not enough and enough. For me, that's around 10-12'mm with 15 mm being preferred.

As was noted, eyeglasses changes the equation.

Jon

Travis Vega:
Your question is very subjective, as is mentioned in the other replies.

I wear eyeglasses, now, so for me 20mm or slightly more is preferred, but I can goto 15mm in a pinch, if I have to.

Before wearing glasses (or when I used to wear contacts), I preferred 8mm-15mm, as I found it very comfortable to put my eye in close.

Best you can do is try a few different ones and see what you find to be comfortable.

Longer focal length eyepieces tend to typically have longer eye relief. Along with that, some people like to 'look around' in the eyepiece, some don't. It really all comes down to each person's comfort and what experience they like to have at the eyepiece.

ds

John Abreu:

--- Quote ---Hello,

I'm new to astronomy and I am adding eyepieces and have a question. It seems to me that EP's with a longer eye relief are a bit more comfortable to use. I don't have to move my eye around as much to view and I have less blackout.

Are longer eye relief EP's more comfortable in general?

Thanks.


--- End quote ---
Most people find excessively short eye relief uncomfortable. As to how much is enough for comfortable viewing, that's very much a personal preference thing.

Excessively long eye relief actually increases blackouts for some people, but that only tends to be a problem in very long focal length eyepieces.

I like long eye relief (I like the option of view with glasses as I have astigmatism issues in addition to significant levels of myopia). I really wish someone would bring out a quality, but still reasonably affordable line of 60-70-degree eyepieces with a usable 20mm of eye relief. I have a set of Meade HD-60s (about 17mm of eye relief), and they are OK, but not really comfortable with glasses for me. I also have a bunch of Vixen LV LERs (20mm eye relief), but while I'm perfectly happy with 45-50-degree AFOV fields for planetary viewing, something wider would be nice in the longer focal lengths. I was hoping the ES-62 line would be Explore Scientific's version of Tele Vue Radians, but, alas, this turned out not to be the case.

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