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- COMPARING THE MASUYAMA 25MM 52°, 25MM 65°, AND 26MM 85°
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Eyepieces (14mm - 55mm) Archives
Mar 16 2005 11:04 AM | admin in Eyepieces (14mm - 55mm)
In The Year-Round Messier Marathon Field Guide, Harvard Pennington claims that an eyepiece with a 1° true field is "ideal" for observing Messier and deep-sky objects. To find an eyepiece's true field of view, divide the eyepiece's apparent field of view by the magnification it yields in a given telescope*. By way of example, the 40mm Stellarvue Deluxe Plössl has a 43° apparent FOV, and in my 8" F6 Dobsonian reflector it yields 30x magnification, for a true FOV of 43/30 or 1.43° (86 arc-minutes). In any observing session, I reach for this eyepiece first. Why a 40mm Plössl, when there are so many Naglers, Panoptics, ultrawides
Mar 16 2005 12:48 PM | admin in Eyepieces (14mm - 55mm)
In the How-To section of Cloudy Nights, there is an article by Allister St. Claire in which he points out that the low power eyepieces routinely supplied with entry level telescopes can be upgraded for no more than $25.00 ($50.00 with a 2x Barlow). The case Allister makes for such an upgrade is quite compelling and the article is an unusually good source of both information and practical advice.
Mar 16 2005 12:58 PM | admin in Eyepieces (14mm - 55mm)
I do not own a Paracorr. I wish I did. My 16 inch f/4.6 would benefit from a Paracorr more than any scope I have ever owned. The following report is some of what I have experienced so far with no Paracorr to help the scope do better.
Mar 16 2005 01:07 PM | admin in Eyepieces (14mm - 55mm)
The fit and finish of the 25mm plossl seem good to very good. The eyepiece has an unusual smell to it. It smells like rubber (I guess from the rubber surround). Overall I would rank in about par with other generic plossl eyepieces that are available on the market. I would have to rank this at about 80% of the fit and finish of Plossl's costing much more. The eyepiece looks to be coated with at least 1 layer of MgFl coatings
Mar 16 2005 01:40 PM | admin in Eyepieces (14mm - 55mm)
Just returned from the Chiefland Star Party where I was able to evaluate two Leica eyepieces over a 1 week period. These Eyepieces were on loan from APM. First off I would like to thank Markus Ludes for the chance to evaluate them. It was most kind of him
Mar 16 2005 01:51 PM | admin in Eyepieces (14mm - 55mm)
I use my 40mm MK-70 more than my 35mm Pan because it gives a wider field and doesn't hurt the Dob's balance as much. I find it easier to navigate with that 0.3* extra sky visible, even if the stars aren't exactly pin points at the edge of the field. Heck, the eye relief on both of these is so marginal that I can only use my new eyeglasses with them, which puts their unscratched status at risk. I have enough astigmatism that neither focuses cleanly, naked eye, given the
Mar 16 2005 01:58 PM | admin in Eyepieces (14mm - 55mm)
Very well made with chrome lower barrel and black upper piece that has rubber grip ring. Threaded for 2" filters. No eyecup. Lense is set in 5mm approx. Lens edges appear to be darkened. A handsome, high quality looking eyepiece.
Mar 16 2005 02:01 PM | admin in Eyepieces (14mm - 55mm)
The eyepiece is made from CNC maschined black anadized aluminium body. The lenses are fixed in the upper 1/3 part of the housing surrounded by the movable eyeguard, with which you can search your best eyerelief, changable from 10 mm to 20 mm. The 44.4 mm is the distance from eyelens to focus. With this movable eyeguard you have the possibílity to find the most comfortable eyerelief for yourself. Works similar to the movable eyeguard on the XL 40 mm.
Mar 16 2005 02:13 PM | admin in Eyepieces (14mm - 55mm)
For the past few years I've revered my 30mm Leitz 88 degree as the ultimate wide field eyepiece for panoramic viewing. The 30mm Leitz's performance blew away and displaced many great eyepieces like my 56mm Meade Super Plossl, 55mm TeleVue Plossl, 52mm Omcon Erfle, 48mm Brandon, 40mm University Optics MK70, and a 35mm Panoptic. The 30mm Leitz is a simply amazing eyepiece, and it has never disappointed me.
Mar 16 2005 02:43 PM | David Knisely in Eyepieces (14mm - 55mm)
Intrigued by the fine performance of the Antares 5-8mm Speers-Waler eyepiece, I decided to take a look at another eyepiece in their line, the 24.7mm Speers-Waler from Sky Instruments. With its relatively low price and potential for a wider field than my 24mm Koenig yields, it could have easily found a place in the 1.25" eyepieces I wanted for my 80mm f/5 refractor. After some testing
Mar 12 2005 11:02 AM | admin in Eyepieces (14mm - 55mm)
My interest was roused by an ad for the "I3 Piece" image intensifier eyepiece by Collins Electro-Optics. It claims an increase in the light grasp of a telescope by about two magnitudes, or the equivalent of a non-intensified telescope 21/2 times larger. Then there was that positive review of the I3 Piece in the February 1999 Sky & Telescope. I also visited the Collins Electro-Optics web site for more information. The answer to a dilemma appeared to be at hand - more light grasp without more telescope to lug around.
Mar 16 2005 10:52 AM | admin in Eyepieces (14mm - 55mm)
Though the merits and limitations of these two eyepieces differ, both are good and worthy of consideration for inclusion in one's eyepiece collection.
Mar 16 2005 01:59 PM | CN_Admin in Eyepieces (14mm - 55mm)
For many of us, a Rodenstock or a Nagler 31 is a little outside our ballpark. Faced with the reality of limited funds, we find there are many remaining choices, but two of the undisputed best commonly available eyepieces in this FL are the Pentax XL 40 and the TV 35 Panoptic. Both are wonderful wide field eyepieces, and both are heavy hitters on the pocketbook.
Mar 17 2005 10:16 AM | admin in Eyepieces (14mm - 55mm)
I have been observing for over three years and have owned 4 telescopes so far. My first Telescope was a C102HD. Craving for aperture drove me towards an Intes MK67 6" Mak-Cass. You'll probably guess what happened next - a bad case of aperture fever got me looking into a larger scope. After much research, deliberation, humming & hawing and some dreaming, I decided to build a 12.5" f/5 dob. It took me almost a year but I finally got it done. The mirror is a gem from Steve Swayze (therein lies another story which may be told another time). Besides the dob, I have a ST80 as my quick look scope plus 'super finder' for the dob.
Mar 17 2005 10:14 AM | admin in Eyepieces (14mm - 55mm)
I've only been able to compare my 30mm Widescan against a 20mm Nagler. I've been using it on a 14.5" 4.5 Dob. My optics are first rate. The Widescan is an awesome eyepiece with almost 90 degrees to it. It DOES have distortion on the outer 10-15%. On axis it is first rate. The 20 Nagler does NOT pass as much light through because they're trying to get the very outer edges of the view sharp.
Mar 16 2005 12:57 PM | admin in Eyepieces (14mm - 55mm)
I spent Saturday making a homemade eyecup for my original-styled 14mm Meade UWA. I wanted to test it out to try and get the right positioning height for it while used in my 8 inch f/6 Dob Newtonian when viewing the Orion Nebula and the moon through clouds. The clouds and wind were problematic this Saturday night (19th). As best as I could tell, this newly fashioned eyecup made lunar and deep sky viewing acceptable (unlike my earlier no eyecup results) with the 8 incher. The eyecup material is a camera film case with end cut out and inserted upside down into a cardboard frame.