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Thread: EP to scan for DSO

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    Default EP to scan for DSO



    After quite a few nights with XT8 looking for mostly DSO. I found that I was using mostly Orion Sirius (52 deg) 25 mm and 2x barlow very often. I ended up committed a ES 82* 11mm for my detailed DSO observation.

    I realized the importance of a wide FOV EP to hunt down DSO. Initially, the plan is to get ES 82* 24mm for that job. However, I would like to use the just arrived 1.25" DGM NPB nebula filter to block out LP. I choose 1.25" for both short and long FL EPs. Also, I try to avoid the trouble of switching 2" and 1" adapter and the extra cost to get 2" filter.

    Now my reasoning reaches a conclusion that I should try to find a 68-degree 1.25" EP that gives me largest FOV with 1.25 format and also can use my 1.25" filter. A compromise on cheaper 1.25" optics/filter over 82-deg AFOV.

    So I am looking at ES 68* 24mm or Orion Stratus or Baader Hyperions. Some even say Stratus = Hyperions. I am leaning toward to ES, but would appreciate more insight from astropals. Is EP 68* a good call?

    My goal for this EP is to scan for DSO and may also doubly shows sharp contrast and resolution for open cluster.

    Thanks!

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    Default Re: EP to scan for DSO

    Yes, the Hyperion 31mm Aspheric would give you a wider field of view. It can also be converted into a 2 inch eyepiece.
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    Default Re: EP to scan for DSO

    Thanks for the suggestion. It is interesting that it can be used for both 2" and 1.25". Will the AFOV in 1.25" config reduce from 72 degree to about 68 degree, which is the normal maximum for 1.25" EP?

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    Default Re: EP to scan for DSO

    The Hyperion and Stratus EPs are very similar but not exactly the same. I've used both, and I prefer the Hyperions. They both can experience issues with a brightening around the outer edge of the FOV, with the Hyperion having less issue with that. Otherwise they are good eyepieces. When I had my Hyperions, I used the 21mm a lot for sweeping up DSOs. I never bought the 24mm because there were complaints about its quality as compared to the rest of the line. One thing you might consider if you want 68 deg are the Explore Scientific 68 series. Personally, I sold my Hyperions off and now completely run the ES 82 deg series because they are excellent quality and I like the 82 deg AFOV. The 18mm is my workhorse, though I really like the 24mm as well. If you want to stick with a 1.25 inch format, then I can recommend the ES 68 series, either the 24 or 20mm EPs for DSO hunting.
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    Default

    I have to say that having got used to wide field 2" eyepieces, there's no way I'd willingly go back to 1.25" ones - filters may be more expensive, but having a much bigger field of view makes it well worthwhile - there's a lot to be said for being able to see around two and a half times as much sky
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    Default Re: EP to scan for DSO

    I'm with you there Jerry. Can't beat the fov in the 2".
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    Default Re: EP to scan for DSO

    Two questions that may help me to decide:

    I knew that the 1.25" filter is to be attached at the barrel of the EP. I would image the 2" filter is also to be put at the bottom of the EP barrel. However, I read some posts that seem to suggest the 2" filter can be mounted on the 2" adapter(?) so that both 2" and 1" EP can see through that filter. Is that possible for my XT8?

    Another question:
    Is it a really hassle to exchange between 1.25" and 2" EP fiddling with the adapter? I have never play that with my XT8 yet.

    Thanks!

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    Default

    Some of the 2" to 1.25" adapters are threaded to take 2" filters on the bottom of the adapter - the adapter drops into the 2" focuser like an eyepiece does, and the 1.25" eyepiece drops into the adapter like a normal focuser.

    So if you have (or add) a suitable adapter, you can either screw the 2" filter to the adapter or a 2" eyepiece - if you had a refractor with a 2" diagonal, you might be able to screw the filter into the diagonal nosepiece instead, which would let you swap between 2" and adaptor plus 1.25" without changing the filter, but with a reflector you'd probably have to swap the filter between the 2" eyepiece(s) and the adapter - but you could swap the 1.25" eyepieces while leaving the filter on the adapter.

    I haven't found using the adapter a problem - it's probably less hassle than swapping a filter between 1.25" eyepieces . Also, quite a few eyepieces have a hybrid design with a 1.25" barrel and a 2" lower body - so you can use them in either size focuser.
    (there's no optical point in using a 2" barrel on a short focal length eyepiece, since you're only looking at the middle part of the image anyway)

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    Default Re: EP to scan for DSO

    Great! I'll check if my XT8 has the threaded adapter. The worst (best) case will be that I just buy another 2" filter put on the adapter for both 2" and 1" EP. My 1" filter may be for my son's XT4.5.

    If that works out, then I will go for the EP 82* 2" EP 24mm...

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    Default Re: EP to scan for DSO

    I use the Orion 2 to 1.25 twist-lock adapter which is threaded for 2 inch filters in the bottom. I really like the adapter and highly recommend it. The same thing can be had under the Antares name from Agena Astro (which is cheaper than Orion and has free shipping to boot).

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