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About SpaceWalker

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    Star Forming

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    Astronomy, Photography
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    US East Coast

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  1. SpaceWalker

    Widest Field Eyepiece-

    Nice catch I missed it. Indeed, the 42mm LVW with FS of 46.5mm provides the widest view possible in 2" focuser. In 120/80 refractor it should give ~2.8*TFOV assuming no distortion. BTW, have you performed timing test to be sure it really shows 3.02*TFOV? I suspect that 72* at 42mm is too optimistic for a 2" focuser even though if the EP would be capable, e.g. in 2.5" focuser
  2. SpaceWalker

    Widest Field Eyepiece-

    AFOV has nothing to do with TFOV. An eyepiece with 46mm Field Stop, assuming that the OPs refractor FL= 960mm, will give TFOV=2.7*. The closest out of 100* AFOV eyepieces, a 25mm ES100, will give TFOV=2.4*. All the others suggested by you will give narrower view.
  3. SpaceWalker

    Polarising filters for visual

    I observe mostly in a Red Zone and, frankly, I don't know any EFFECTIVE LP filter. Any polarizer is useless for LP reduction. Sometimes UHC can help but not much. As they say, the best is a "gasoline filter", when you load full tank and drive to a dark sky area . Or wait for a moonless night. Variable polarizer is good for closely located objects different in brightness like Sirius A and B etc. You can cut the price by getting 2 inexpensive single polarizers e.g. from eBay or so. Attach one to a diagonal or 1.25/2 adapter (in reflector) and the other one to eyepiece, or better, to an extension tube and you can change eyepieces on the go.
  4. SpaceWalker

    Widest Field Eyepiece-

    Any eyepiece with Field Stop of 46mm. For example, depending on your budget, 41mm TV Panoptic, 40mm ES68, 40mm WO Swan or similar.
  5. SpaceWalker

    Seeking advice about cheap eyepieces

    IMO, the best budget planetary eyepiece is a decent Zoom + Barlow. This combo is relatively inexpensive and very flexible, you can reach appropriate magnification perfectly matching the seeing conditions just in seconds and, therefore, catch rare moments of perfect seeing which usually can last 10-20 seconds. Think about that. If you are a budget observer you can't avoid using Barlow or you must pay extra for fixed focal length eyepieces, there is no free lunch . I can't recommend 66*AFOV SWA eyepieces for planetary, they are not good for that, IMO. But if you still want fixed focal length eyepiece, I'm second to Davesellars, the 6mm BCO or 10mm BCO+Barlow would be a good choice. But eye relief especially in the BCO6 is very short. I have both of them. You can also try getting a 5mm BST Stargutder, many observers are happy with it. If you have a chance buy on the used market, it'll save you a lot of money. http://www.teleskop-express.de/shop/product_info.php/info/p463_Baader-Classic-Ortho-6mm-1-25--Eyepiece-with-rubber-eyeshield.html https://www.firstlightoptics.com/bst-starguider-eyepieces/bst-starguider-60-5mm-ed-eyepiece.html
  6. SpaceWalker

    Lunt 20mm HDC

    There are indeed some useful threads on CN discussing 100*AFOV eyepieces including the Lunt. For those who are interested I'd suggest to check out the thread *Lunt XWA 9mm* on CN, especially posts ##9 and 11 by vkhastro1. https://www.cloudynights.com/topic/563666-lunt-xwa-9mm/
  7. SpaceWalker

    WO SPL 3mm - Same but Different ?

    Manufactured by Long Perng. Some variety of outfits. But the optics should be the same. http://www.longperng.com.tw/goods.php?act=list&catId=20&page=4
  8. SpaceWalker

    Kasai Trading Co. 1.25" AstroPlan Eyepiece

    John is right as usual, they seem are well-known 5-element Masuyama-like. For example, there is an older thread on CN discussing Kasais https://www.cloudynights.com/topic/304722-kasai-astroplan-eyepieces/ IIRC, Bill Paolini posted on CN he liked longer FLs better than TV Plossls and vice versa for shorter FLs.
  9. SpaceWalker

    Baader Genuine Ortho 9mm

    John, Thanks for sharing your experience. I knew that the Antares Orthos, UO HDs and BGOs are considered pretty much the same optically except coatings, but haven't had a chance to try BGOs in person so my gesstimates based on multiple positive reviews across the web like from Alvin Huey (FaintFuzzies.com) etc. It seems the grass as usual is greener on the other side of the fence . As for TV Plossls some experienced observers claiming that the older Plossls provide brighter images, for example here (http://www.astronomyforum.net/telescope-eyepieces-forum/224964-televue-made-taiwan-2.html) J.Gardavsky says that about the older 13mm and 21mm TV Plossls. I can guess that well known Okulartransmission(http://www.amateurastronomie.com/Astronomie/tips/tips3.htm) data from Markus Ludes showing high light transmission in the TV Plossls based on the older TV EPs.
  10. SpaceWalker

    Baader Genuine Ortho 9mm

    Excellent BGO collection, congrats on your find! Any owner of a good refractor can dream about it. With the time I more and more appreciate Orthos over Plossls. Even in my Dob they work really great, I don't care about the narrow field. Maybe it's just me, but Orthos show views slightly sharper than Plossls with more contrast
  11. SpaceWalker

    Baader Genuine Ortho 9mm

    I have the 7mm Antares HD Ortho. While I agree that the Antares HD Orthos are excellent and optically the same as the BGOs, they still differ being *Multi-Coated* vs *Phantom Multi-Coated* BGOs. Those famous proprietary Baader Phantom Multicoatings are, probably, what makes BGO stand out by adding just few percent extra transmission, IMO.
  12. SpaceWalker

    ES 24mm in 68 or 82?

    It doesn't matter. The older 2" Meade 82*AFOV eyepieces as well as the ES82s are made by the same manufacturer, JOC, so the optics are identical. It's NOT the field stop. As John has correctly noticed the FS in many modern ultra wide angle eyepieces is buried inside, so your choice would be either to trust manufacturer's info if available or to disassemble the eyepiece for measuring the FS. Although, you can figure out the real AFOV in a different way. Hold the EP at arm's length directing it toward light source like a lamp and take a caliper into the other hand and measure the exit pupil. Than do math.
  13. SpaceWalker

    ES 24mm in 68 or 82?

    I'm afraid that's not true. Check out the 24mm ES82 specs on the Explore Scientific website (http://explorescientificusa.com/collections/82-series-eyepiece/products/82-24mm?variant=589728169), it says 33.5mm.
  14. SpaceWalker

    Planetary eyepiece for XT8

    IMO, one of the best planetary solutions could be a Zoom + 2x Barlow. That's what I used to do. It allows to dial proper magnification on-the-fly so you catch rear moments of stable seeing between turbulences which frequently last only 20-30 sec or even less. When you changing fix FL eyepieces you usually missing these moments. BTW, I have the 11mm ES82 and it works pretty good combined with my 2x TeleXtender at 218x on my 1/6 Dob when the seeing allows this magnification.
  15. SpaceWalker

    Yet another SW ep?

    I noticed the same thing and it puzzles me a lot. Until recently I thought Barsta is a manufacturer but now... I'm not sure...

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