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Thread: Explore Scientific 25mm 100* EP

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    Default Explore Scientific 25mm 100* EP



    This past new moon I attended the Golden State Star Party (GSSP) near Adin California (close to the Oregon border). Excellent dark skies as usual. GOOD! Very short nights. BAD!

    Scott Roberts, whom I have been 'marginally' acquainted with over the past 10 to 15 years (as I used to always attend the Riverside Telescope Makers Convention), also attended GSSP representing his company Explore Scientific. When not a rep, he simply hung out and observed with us. His is an amateur astronomer.

    I had my Obsession UC22 at the party. This is a 56cm f/4.2 Dob with Ostahowski optics. I asked Scott to borrow a 25mm 100* series EP for a night. I had heard this was not a great EP. I have the 20mm, 14mm, and 9mm ES 100*. And I'll be honest, for the money I am a fan boy of those three having looked at 21mm and 13mm Ethos. I use an original Paracorr in the UC22.

    To be frank, the 25mm 100* EP is wonderful IMO. Its IS hard to take in the entire FOV, and the 'edges' are just a bit soft, but when I say edges, I mean I have to move my head to take that in. We used my 31mm Nalger, and a 40mm Pentax XL as well. It was easier to see the field stop in the 31, and a tad (and I mean a tad) sharper, BUT it was harder to get that huge exit pupil centered. The 40mm was really sharp. But was 'a bit like a soda straw' even at 68*. And the 25's exit pupil is pretty big as well. I did not have a 21mm Ethos to compare. But I already have 20mm ES 100* and everyone loves the views.

    So if you are 'an edge astronomer' where you stress about the edge, you'll not like the 25mm. But it is NOWHERE near as bad as reviews I have read.

    Full disclosure however. I did not pay anywhere near the $800USD price. The 31mm is the most I have ever paid. Of course the best advice is go to a star party and TRY before you BUY. It worked (and lightened my wallet) for me.
    Los Angeles Area - Equip: 56cm f/4.2 Obsession, 45cm f/4.5 Litebox Dob, 18cm f/5.6 Teleport, 10cm f/5.4 TV-101 APO, 76mm f/12 Vixen Achro, Coronado MaxScope 40 Ha, Coronado SolarMax 60 Ha, Lunt CaK module mounted to an Orion 10cm f/5 achro Mounts: Vixen GP, Vixen GP2, Vixen Polaris, UA Unimount Deluxe, TV telepod.
    EPs and accs: Partial list... 31mm Nagler, 25, 20, 14, and 9mm Explore Scientific 100* Series, 7 and 4.8 Nagler, 2-4 + 3-6mm Nagler Zoom, full set Fujiyama HD-Orthos, Denk quick switch binoviewer, Gen1 Paracorr, AP Barcon, 5x Powermate, NBP, OIII, and UHC... etc

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    Default Re: Explore Scientific 25mm 100* EP

    Good that you enjoyed it and thanks for the review.
    If you think 68░ is "soda straw", I have some 30░ Hastings Triplets that would make it feel picturesque!
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    Default Re: Explore Scientific 25mm 100* EP

    Thanks for the review.

    I own the ES 20mm 100░ and got to compare it against the Ethos 21mm 100░ in a 24" Dob last summer. Although the Ethos did perform slightly better than the ES, the background in the Ethos was just a tad darker giving a little better contrast, the difference did not equate to the $500 difference in price between those EPs. So hearing that the 25mm 100░ is also a high performer is heartening. It will go on the "wish" list.

    Cheers,
    JT
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