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    Don Trinko's Avatar
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    Default 5mm EP with good eye relief?



    I'm looking for a 5mm EP for a 66mm/400mm Astro-Tech refractor. What type of EP would have the most eye relief and good resolution? Thanks; Don T.

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    Hi Don

    Depends on how much you want to spend, and I assume you are looking for a planetary EP? Vixen makes a 4mm and 6mm (no 5mm) in the NLV series that have 20mm ER which is particularly comfortable

    The Orion Epic 5.1mm also has 20mm ER

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    Hi Don,

    I have an Orion Stratus 5mm EP (68 deg AFOV) with 20mm eye relief.

    The optics are decent on-axis. Things are not as well-focused off-axis and there is some chromatic aberration near the edges. But overall it has served me well in my 1200mm focal length Newt.

    This EP sells for $135 from Orion.

    That is the only 5 mm of which I have any hands-on knowledge. Hope this helps and that others will chime as well.
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    Quote Originally Posted by MarkM View Post
    Hi Don,

    I have an Orion Stratus 5mm EP (68 deg AFOV) with 20mm eye relief.

    The optics are decent on-axis. Things are not as well-focused off-axis and there is some chromatic aberration near the edges. But overall it has served me well in my 1200mm focal length Newt.

    This EP sells for $135 from Orion.

    That is the only 5 mm of which I have any hands-on knowledge. Hope this helps and that others will chime as well.
    Hi Mark,

    Yeah in the "big" eps the Baader Hyperion and Vixen LVW and Pentax XW all have 20mm ER and are really great performers but I held back from them as I would think the weight might become an issue with the little AT66.

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    Quote Originally Posted by Vinnie View Post
    Hi Mark,

    Yeah in the "big" eps the Baader Hyperion and Vixen LVW and Pentax XW all have 20mm ER and are really great performers but I held back from them as I would think the weight might become an issue with the little AT66.
    That Stratus is hefty as well--fondly referred to as a German Grenade in one review I saw.

    I have not *yet* entered into realm of refractors where weighty EPs can be an issue.
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    Don Trinko's Avatar
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    Thanks for all the ideas. I will be using this mostly to look at the planets. I don't want to spend $200+. I would like to spend around $70 to $100.
    Thanks; Don T.

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    Yeah well the Stratus and Hyperion are possibly the same EP. They sure are similar. The weight isn't a factor in most refractors but I'm a bit in two minds with the AT66 being a very compact scope. Could well be OK, just not sure.

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    Quote Originally Posted by Don Trinko View Post
    Thanks for all the ideas. I will be using this mostly to look at the planets. I don't want to spend $200+. I would like to spend around $70 to $100.
    Thanks; Don T.
    Yep Don

    Orion Epic ED-2 Telescope Eyepieces - Telescope.com

    You don't need a particularly wide AFOV for planetary, but as you have already gathered, a lot of EPs do run very short on ER at short EPFLs

 

 

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