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Burgess Optical Burgess/TMB Planetary 9mm
Brand | Burgess Optical |
Part Number | |
Availability | available |
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Reviews
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Oct 18, 2007
Burgess Optical TMB Planetary 9mm
Pros:Light weight, nice FOV, well made, great on planets
Cons:Not good on DSO's, some color.
Comments:One of the best features of a star party is the availability of eyepieces you can try out that you have never used before. I had a chance to use this Burgess 9mm eyepiece recently on my 8" f/10 LX-90 SCT and I found it was a decent eyepiece - not great but decent.
Bottom Line: Would you recommend this item? Yes
A nice feature of this EP is the adjustable eye cup. Also, this EP was almost distortion free. There was some chromatic aberration near the edge in about the last 20% or so of the FOV, but it was acceptable. Jupiter in this EP was almost color free, but this EP did have some internal reflections on very bright objects.
The cost new is $99. It sports a 60 degree FOV, 16mm of eye relief, 6 glass elements and weighs almost 6 oz.
On planets and the for lunar views this eyepiece excels, but on DSOs it just don't make the muster.Dec 29, 20069mm Burgess Optical/TMB Planetary
Pros:> Generally good views and detail
Cons:
> Nice adjustable eye guard> Short Eye relief
Comments:
> Not as crisp as the 4 & 6mmThe 9mm Burgess Optical/TMB Planetary eyepiece is well built, has good optics, and great lens coatings.
Bottom Line: Would you recommend this item? Yes
The eyepiece has a twist-up eyecup as well as the standard rubber fold down eye guard which is a very nice feature. Both work very well. The barrel has a wide undercut safety groove that's a little bigger than most. Along with about 15mm of eye relief, the BO/TMB 9mm has a 60° FOV which makes the eyepiece easy to use in a non-driven scope like a DOB.
The 9mm BO/TMB has excellent ergonomics. It is very easy to use with excellent eyepoint. The eye relief is a bit short and may cause problems for eyeglass weares. For a 9mm eyepiece, it is one of the more comfortable I've used. In a DOB the field of view is sharp to within +/- 15% of the edge, then you get a bit of aberration and coma. The BO/TMB 9mm shows a ring of false color at the edge of the FOV in my DOB but it's faint.
As others report, this eyepiece still has a very minor issue with internal reflection even with the new retaining ring when a very bright object like the moon is right at the edge of the FOV. If a very bright object is just outside the FOV, it has a very slight an internal reflection. If a bright object is within the edge of the FOV is results in a more pronounced internal reflection and 'ghost'. This isn't a huge problem and really only happens when you're trying to view a target right next to the Moon.
Contrast and detail with the 9mm BO/TMB eyepiece are very good for a $100 eyepiece as is the light transmission. With good seeing the 9mm BO/TMB eyepiece showed a bit more surface detail with clearer boundaries than the Univ. Optics Ortho but not as good as the Baader Phantom ortho. When internal light scatter is present it tends to mute colors compared to more expensive eyepieces, but under the majority of viewing this isn't a problem. On stars the 9mm BO/TMB eyepiece gives crisp, pin point images in the central, on-axis view out to within 10 or 15% of the edge.
The 9mm Burgess Optical/TMB Planetary eyepiece is an excellent choice for a Planetary and sometimes general use eyepiece. IMHO, for a dedicated Planetary eyepiece in the $100.00 price range an Abbe Orthoscopic provides a little better detail and resolution but it's at the cost of AFOV. If you use a DOB or non-driven mount, the 9mm Burgess Optical/TMB Planetary eyepiece with it's 60 FOV is much easier to use because it doesn't require as much 'bumping' to keep the target in the FOV. Of the BO/TMB Planetary Series the 9mm is my least favorite. As indicated, in this focal length I prefer an Abbe Ortho which is much smaller and lighter. When comparing the BO/TMB 9mm against several orthoscopic eyepieces it didn't fair as well as the 4 & 6mm BO/TMB did against their counterparts. The 9mm BO/TMB is still a good eyepiece and those using a DOB or non-driven mount will want to look at this eyepiece.Sort by