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Equipment Discussions >> Eyepieces

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Sarkikos
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Reged: 12/18/07

Loc: Suburban Maryland, USA
Re: Best high power eyepiece for C102GT? new [Re: BillP]
      #6138843 - 10/15/13 11:36 AM

Quote:

FWIW I find it easy to tease out on-axis differences between eyepieces, especially with the APO...you just have to know where to look on a target and for what features that are most susceptible to minor performance differences on-axis.




It does help to know the target and to have a very good idea what to look for. When I read a comparo between eyepieces with a planet or the Moon as subject, I want to hear specifics about surface features. Ideally, the observer should have years of experience in teasing out fine details. No astronomical tourists need apply.

I don't want to hear anything like, "The image was essentially the same," "No appreciable differences, "Any differences were too subtle to be concerned about." Everytime I read comments like those, I can't help but think, "Does this observer even know what to look for?" Please, give details about how fine surface features appear differently in the two eyepieces, even if those differences are only "subtle." IME & IMO, subtle differences are what it's all about for planet/lunar observation. That's what separates the XO's from the BGO's.

Mike


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Sarkikos
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Reged: 12/18/07

Loc: Suburban Maryland, USA
Re: Best high power eyepiece for C102GT? new [Re: BillP]
      #6138859 - 10/15/13 11:46 AM

Quote:

It's all a balance of things and one attribute for me never trumps others. So for the overall gestalt I feel the Sterlings do a better job overall than the TVs. They also have killer good transmission and wonderfully uniform backgrounds with no lightening near the field stop.




Have you ever done a direct comparion between Sterling Plossls and TV Plossls for light transmission? I suspect the Sterlings might have a little better throughput because of the neutral tone vs the warm tone of the TV's. I regret having sold both my TV Plossl 25's before I could compare them to my Sterling 25 on the Horsehead.

Quote:

I usually keep the 25mm, 17mm, and 12.5mm in the Baader Turret on my TSA-102. Those three and a 7mm Pentax SMC Ortho or a 6mm ZAO-II in the 4th slot makes a great workhorse turret, and nice in that the wider AFOV of the Sterlings make them feel like mini-wide fields




You don't bother with the Sterling 20mm on the Turret? I suppose it made most sense to jettison that one to allow room for a shorter focal length eyepiece.

Quote:

Just love their convenience. Also, they are killer sharp with that Baader 2.2x Barlow that is part of the BCO set. Was out this morning with that arrangement on my TSA observing Orion and the Perseus Double and Jupiter, and the Moon last evening - Nirvana




I've never tried the Sterlings for Jupiter or the Moon. I'm used to Orthos, XO's or TV Plossls for those objects.

Mike


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dbowlin
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Reged: 09/03/09

Loc: Littleton, Colorado
Re: Best high power eyepiece for C102GT? new [Re: Sarkikos]
      #6140002 - 10/15/13 11:06 PM

I like my ES 82's so much I have thought about selling my UO HD's? But I have more testing to do. Time will tell.
Dale


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BillP
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Reged: 11/26/06

Loc: Vienna, VA
Re: Best high power eyepiece for C102GT? new [Re: CollinofAlabama]
      #6140452 - 10/16/13 09:03 AM

Hi Collin. Yup, of all the Meade 5000/ES82s from 18mm and shorter, I liked the 8.8 the best. The preferences was not because of any specific testing, but just a general impression from use over time. I just kept coming back to that particular eyepiece while observing and always feeling that its FOV was the best corrected and the most engaging. Always loved the view it put up.

Since the OP though wants a planetary eyepiece, then with his scope something along the lines of a 7mm focal length (143x and .7mm exit pupil) would probably be best. So the 6.7mm would probably be the best option if he wants to keep it an 82 degree. I would go the traditional route myself though since teasing out the best the eyepiece can get is important for me and get a 7mm Ortho (Hutech, Fujiyama, UO HD). Might be handy to have an 8mm around also for when the seeing not as good. Basically IMO 6mm, 7mm, 8mm would be the perfect planetary trio for this scope that would get the most mileage. So in current marketplace of new stuff, probably the Fujiyama 6mm and 7mm Orthos, then the 8mm Brandon (or alternatively the TV 8mm Plossl if couldn't afford the Brandon).


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photiost
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Reged: 12/14/06

Loc: Montreal, Canada
Re: Best high power eyepiece for C102GT? new [Re: dbowlin]
      #6140487 - 10/16/13 09:21 AM

There are many very good used Orthos to choose from and if you are patient also look at the used market for TV plossls, Celestron Ultima Plossls, and Meade series 4000 (Japan) .

For someone on a budget these are excellent eyepieces and coupled with a TV Powermate barlow you will get excellent results on your 102mm refractor.

Remember your scope is limited to about 300x on very good nights and you will find most nights your max will be around 150x to maybe 200x (depending on your site) so choose your eyepiece and barlow set with this in mind.

Enjoy your scope !!
.


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Ain Soph Aur
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Reged: 08/11/11

Loc: West Tennessee
Re: Best high power eyepiece for C102GT? new [Re: photiost]
      #6141214 - 10/16/13 04:15 PM

Totally outside the OP's scope, but I have I found the 32/24/16/12mm Brandons mounted on a Baader Q-Turret with the integral 2.25x Q-Barlow to be sublime for this scope.

This combo gives 14.2/10.7/7/5.3mm with good ER, parfocal, perfect for planetary, lunar, double star, etc.

If I need wide field views, the ES82/30 is a treat in the C102GT!


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BillP
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Reged: 11/26/06

Loc: Vienna, VA
Re: Best high power eyepiece for C102GT? new [Re: Ain Soph Aur]
      #6141253 - 10/16/13 04:40 PM

Sounds like a killer setup Btw, I have the Baader setup but never used the Barlow. A few evenings ago I decided to try out the Barlow integrated into the Turret's tube. OMG I was in shock at how excellent it performed! Way beyond my expectations. The smallest FL eyepiece I had in the Turret was a 7mm Pentax SMC Ortho. With the Q-Barlow lens elements threaded into the Turret it is supposed to give the same 2.2x magnification, so the 7mm SMC Ortho would effectively be 3.1mm. That was mated on my TSA-102 for a resulting magnification of 262x. The view was razor sharp! As you said....sublime

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kkokkolis
Carpal Tunnel
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Reged: 09/23/09

Loc: Piraeus, Greece
Re: Best high power eyepiece for C102GT? new [Re: BillP]
      #6141300 - 10/16/13 05:00 PM

Off topic, but, is the Q Barlow really that good? I was going to buy it today but I had my reservations (mainly that it can't be threaded on eyepieces without enough clearance) and didn't.
Also, a friend was selling his Q-Turret and I asked him if it was good. He said, no, let someone else buy it, it has poor quality. I was going to use it with my BGOs (and perhaps an ES68 24 or a 28mm RKE if the ES would prove heavy).
Sorry for off topic again.


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BillP
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Reged: 11/26/06

Loc: Vienna, VA
Re: Best high power eyepiece for C102GT? new [Re: kkokkolis]
      #6141550 - 10/16/13 06:50 PM Attachment (4 downloads)

Off-topic reply

How many turrets are out there? I see one or two for over $700. The Q-Turret is $85!!! Is it metal? No. Only the barrel that inserts into the focuser is metal so you can tighten it a lot without issue. The rest is a heavy ploymer/plastic. The rotating click stop mechanism has multiple mechanisms to provide the flexure and click stop, so if one should break over time will still have the backup one operating.

Overall I place it as a high value item and increadibly handy. It does not look flimsy and IMO it is not. I've had it holding 4 Pentax XWs and it had no issue handling the weight. What had the issue was the diagonal on the refractor and getting that tight enough so it would not rotate under the weight of 4 XWs Handling it with care, just as I do with my scopes and eyepieces, I don't expect it to ever break or fail. And if it does, big deal because one can purchase 9 of these for the price of the least expensive Hex Turret ! The only thing I do not like about it is the lack of compression rings. But am in process of replacing the metal set screws with nylon ones so that is easily remedied.


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photiost
professor emeritus
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Reged: 12/14/06

Loc: Montreal, Canada
Re: Best high power eyepiece for C102GT? new [Re: BillP]
      #6141661 - 10/16/13 07:42 PM

Quote:

Off-topic reply
....
....
But am in process of replacing the metal set screws with nylon ones so that is easily remedied.




This is the most simple yet effective remedy.

For $85 I can take the plunge and try it out. If I dont like, it will be donated to our club.
.


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JustaBoy
Carpal Tunnel


Reged: 06/19/12

Re: Best high power eyepiece for C102GT? new [Re: photiost]
      #6141694 - 10/16/13 08:00 PM

Hi Bill,

I have a question:

In your pic you have the 25mm Sterling positioned for viewing - What happens when you rotate to the 20mm... Does the 25mm interfere with your head space?

Thanks,
-Chuck


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BillP
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Reged: 11/26/06

Loc: Vienna, VA
Re: Best high power eyepiece for C102GT? new [Re: JustaBoy]
      #6141816 - 10/16/13 09:10 PM

If you put the largest to smallest eyepieces in the turret in clockwise order, then rotate the orientation 45 degrees, it does not interfere. So right now I have it set in the picture aligned with the axis of the scope. i.e., the 25mm to the one opposite it (the 12.5mm) are aligned with the scope's body. When I observe, I rotate it so the line formed by the 25mm-12.5mm is oriented 30 to 45 degrees to the left of the axis of the scope. Doing this then, for left eye viewing, does not interfere with head if the EPs are substantially different sizes.

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JustaBoy
Carpal Tunnel


Reged: 06/19/12

Re: Best high power eyepiece for C102GT? [Re: BillP]
      #6141887 - 10/16/13 09:51 PM


Sounds good...Now if I can only figure out how to modify your instructions, since I observe with my right eye:-)

Thanks Bill!
-Chuck


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