TMB Super Monocentric 6mm

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TMB Super Monocentric 6mm
Fabulous planetary performance. I am using 2 in a TV Binovue

Overall Rating: 10
Optics:10 Value:10
Weight: 3 (Unreliable Vote)
Date:
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Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=317677

TMB Super Monocentric 6mm
My favorite higher power eyepiece in my TOA 130. With this EP I am able to easily resolve Castor , see Cassini's division clearly (when seeing permits) , and obtain beautiful views of many close double stars. Much sharper and brighter than my 5 mm Radian despite the slightly lower magnification.

Overall Rating: 10
Optics:10 Value:10
Weight: 6 (Veritable Vote)
Date:
By:
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=332277

TMB Super Monocentric 6mm
I use the 6mm TMB on my 6" achromatic refractor. The best thing about it is the lack of ghosting and "sweet spot". Planetary images are equally sharp across the entire field of view, so it doesn't matter whether you are at the edge or in the center. The smaller FOV is irrelevant if you have a clock drive, and still doable if you don't, because you can position the image anywhere in the field. No abberations whatsoever in this eyepiece, which is important if you are using a Chinese refractor. I find I can get by without using my v-minus filter using this eyepiece, and it gives 200 x @ F/8 which is good power under most atmospheric conditions; so it is a workhorse for me. A think it is a good value, considering the price of multi-element wide fields, which don't perform as well.

Overall Rating: 10
Optics:10 Value:10
Weight: 3 (Unreliable Vote)
Date:
By:
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=347300

TMB Super Monocentric 6mm
These eyepieces are well overrated. The reason? - an eyerelief and FOV are too small. Really, too small for comfortable observing which is very important for planetary observing.
What one can expect from the design, which is more than 100 year old?

Overall Rating: 5
Optics:7 Value:5
Weight: 1 (Unreliable Vote)
Date:
By:
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=368666 

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TMB Super Monocentric 6mm
The TMB Monocentric eyepieces (and the 6mm I am reporting on here) are simply the best planetary eyepieces I have ever used.

Positives:

The TMB is critically sharp across the field, and the optical design coupled with the best possible polish and coatings yield the darkest backgrounds I have ever seen in an eyepiece.

Cautions:

The Monocentrics have a relatively narrow field. For their intended purpose, this factor doesn't bother me. When viewing the planets (these ARE planetary eyepieces) I don't use the edges of the field anyway, so I simply position my eye at a comfortable distance from the eyepiece. The background is so dark it is not troubling to me that the field is narrow; I can hardly notice WHERE the field boundary is.

On nights of truly superb seeing, I use this eyepiece with the TMB 1.8 Barlow to get a bit more magnification with my Tak FS-152 than the 4mm eyepiece provides. On nights of less than perfect seeing, the 5mm or 6mm may be the highest power I can use.

Cons:

I seen NO downside to this eyepiece optically or mechanically when it is used for its intended purpose.

Cosmetically I found it difficult to read the focal length (on a band around the top of the barrel) at night.

Overall impression:

I know of no better planetary eyepieces. Period. Thus my optical rating of 10. When you look at the cost of other premium eyepieces (Televue, Pentax, Takahashi etc.) or the used price of a Zeiss Monocentric or Abbe Orthoscopic, I believe the TMB's are a true bargain. Thus my value rating of 10.

Please see additional comments in my 4mm review that generally also apply to the 6mm eyepiece.

Richard Chalfan

Overall Rating: 10
Optics:10 Value:10
Weight: 3 (Unreliable Vote)
Date:
By:
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=405815

TMB Super Monocentric 6mm
Ah, the poor, misunderstood monocentric design. If you add up all the reviews on these eyepieces, both here as well as on other forums, you are bound to get quite a confusing mixture of both praise and problems. I'm not sure if it's the hype or the fact that the average amateur astronomer has a number of wider and more comfortable eyepieces to choose from than ever before, but I suspect most of the negatives you read about is due to the reviewer being unprepared for the unique nature of these eyepieces. Monocentrics are not new, but they've been out of circulation for a number of years, (my pardon to ITE who do offer mono's, but they are relatively unknown), so when your average amateur hears, "best planetary" they might be thinking some sort of high-end ortho. Nope. The design approach for mono's is quite different than either ortho's or plossl's. Forget wide field, forget flat field, forget eye relief. Mono's were designed to provide the sharpest, contastiest and brightest on-axis image of any eyepiece, period. The key distinction is the phrase, "on-axis". Don't compromise the on-axis image in any way with concerns about comfort or FOV. Put as few pieces of glass or other distractions between the viewer and the image. The cemented 3 element design acts as a single element which means just 2 air to glass surfaces to scatter light. A few folks bring up Kelner's which are also 3 element eyepiece's. But the most obvious difference between Kelner's and mono's is the Kelner has a group of 2 lens elements and a single element, or 4 air to glass surfaces. Twice the surface area to bounce light as the mono.

So where's the review? I just had to intro with that because people need to understand when I give a "10" for optics it has nothing to do with comfort or FOV. On-axis, this is the cleanest, sharpest eyepiece I've ever looked through. Period. I own or have owned, Pentax ortho's, Tak LE's, AP Superplanetaries as well as UO ortho's, etc. and to an eyepiece, the TMB is the best on-axis. In my 4 inch, F8 apo, it is sharp right to the edge of it's 30* AFOV. In my 3.1 inch, F6 achro it does start to soften a little at the edge, but 75% of the FOV is sharp. I have a 12.5 inch, F5 newt on order, but even though I haven't had a chance to use it yet in that, I can pretty well predict how it will do. I'll bet on-axis nothing can touch it. Off-axis it will soften even a little earlier than the F6 achro, maybe at 65% before it softens some.

So that's it. TMB has introduced a simply marvelous planetary and double star eyepiece. If you are an experienced planetary or double star observer you will appreciate someone has heard your request for simplicity and rewards you with stunning performance. It's probably not for the casual observer, but I give it the highest recommendation otherwise.

One final comment. With the narrow 30* AFOV the eye relief actually feels longer. At this focal length you literally have to lay your eyeball on the field lens of a 50* AFOV plossl, but can sit back rather comfortably with a 30* mono.

Thanks for putting up with my opinions,
Mike

Overall Rating: 10
Optics:10 Value:9
Weight: 6 (Veritable Vote)
Date:
By:
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=408410

TMB Super Monocentric 6mm
A great eyepiece for planets. Sharp high contrast images. Build quality is also quite nice.

Overall Rating: 10
Optics:10 Value:10
Weight: 5 (Veritable Vote)
Date:
By:
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=484442

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