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Equipment Discussions >> Eyepieces

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Starhuckster
super member


Reged: 09/09/10

Loc: Boston, MA
Re: TMB Planetary II new [Re: rgm40]
      #5833510 - 05/01/13 12:17 AM

I just came in from looking at Saturn through my 80mm f6 and the eyepiece that did the trick tonight was the TMB 4mm. I'm a big ES82 fan, but tonight it was my TMB almost exclusively. I don't think you can go wrong having a couple of these in your kit.

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gregory93
super member


Reged: 07/03/12

Re: TMB Planetary II new [Re: Starhuckster]
      #5847012 - 05/08/13 01:29 AM

Thank you all for your replies!

Well, the week ago i spent all the time observing the galaxies in Virgo.Although i am using most of the time using my 12T4-sometimes i use my hyp zoom at 8mm-i found out that i could use a little more magn (12T4 delivers x100).I could easily go at 8-9mm (and i would prefer that).That's why i am asking for your reports.I just need a little more magn when i observe,mostly,galaxies.The hyp zoom at 8mm does not give me any satisfactory views...


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caheaton
Pooh-Bah
*****

Reged: 05/26/09

Loc: SW Ohio
Re: TMB Planetary II new [Re: gregory93]
      #5847603 - 05/08/13 11:46 AM

I wouldn't call the views mushy, but I used to own a couple focal lengths (4 and 3.2), but sold them after doing a careful comparison one night on Jupiter. I found that a barlowed 8mm TV plossl showed more banding on Jupiter's polar regions. (The plossl was used in both a 2x and 2.5x barlow, which gave it the same fl as the TMB's). After that night I sold my TMB's. The TMB's were more comfortable with their greater fov and eye relief, but I'm willing to sacrifice those for the greater level of detail I saw.
The scope I was using for this comparison was the 120mm F/8.


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hottr6
Carpal Tunnel
*****

Reged: 06/28/09

Loc: 7,500', Magdalena Mtns, NM
Re: TMB Planetary II new [Re: caheaton]
      #5848498 - 05/08/13 07:14 PM

That is interesting. After a night of comparing TMBs with Radians, I could not justify the expense of the Radians and sold them. I still have the TMBs, though now I prefer to use BGOs.

Do TMBs have quality control issues?


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FoxTrot
sage


Reged: 06/01/06

Loc: Melbourne, Australia
Re: TMB Planetary II new [Re: hottr6]
      #5848809 - 05/08/13 09:35 PM

Gregory93, I tried the TMB II 9mm in my TV NP127 which is f/5.2. There was very significant field curvature so it was no good in my scope. Keep in mind though, the TV scopes are very demanding on eyepiece design and quality, and I only have my own eyes to go by... Cheers, Fox

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SpaceRooster
member


Reged: 12/23/12

Loc: Georgia
Re: TMB Planetary II new [Re: caheaton]
      #5849047 - 05/08/13 11:12 PM

I did another comparison between my P-II 7mm and my TV 11mm plossl barlowed x2 last night, and found the same results as you did. The first few times I compared them, it wasn't that huge of a difference. But last night Saturn's details popped out much more in the TV combo than the P-II (specifically the cassini gap, which was a bit muddier in the P-II).

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Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: TMB Planetary II new [Re: FoxTrot]
      #5849098 - 05/08/13 11:39 PM

Quote:

Gregory93, I tried the TMB II 9mm in my TV NP127 which is f/5.2. There was very significant field curvature so it was no good in my scope. Keep in mind though, the TV scopes are very demanding on eyepiece design and quality, and I only have my own eyes to go by... Cheers, Fox




I have a set of TMB Planetary eyepieces and I frequently use the 9mm, the 6mm and the 4mm in my NP-101. They all exhibit what appears to me to be off-axis astigmatism. If my memory is correct, I cannot get them to focus at the edge of the field. Using them with the front section of a 1.25 inch GSO Barlow which provides about 1.5x magnification and a shift in the effective focal ratio from F/5.4 to about F/8.1 really cleans up the astigmatism, a tight double can drift past the field stop still nicely resolved.

For the money, they are quite good eyepieces... Last night I was using the 9mm in my NP-101 from my light polluted backyard to view M65 and M66. I could see both galaxies but they were not easily seen. I switched to the 9mm Nagler, both were slightly easier to see.

Jon


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FoxTrot
sage


Reged: 06/01/06

Loc: Melbourne, Australia
Re: TMB Planetary II [Re: Jon Isaacs]
      #5849972 - 05/09/13 12:46 PM

Hi Jon, agreed. I think they are a very nice eyepiece for the price with excellent construction, great eye relief, very nice action with the eyeguard, and good field of view. But about 10 to 20 percent of the outer edge field of view would not reach focus whilst the on-axis image was in focus (in my scopes). Fox

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