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Louis D

New Christmas Eyepiece Reports

31 posts in this topic

 

 

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Well Santa did eventually turn up yesterday with my Christmas present😀

As you can see a cracking eyepiece and i have been trying to get hold of one of these on the used market for some considerable time. As most of us know who are partial to the XW trying to get hold of a used one is like getting hens teeth. So with Christmas coming up and a few mails to FLO and luckily the wheels of the sourcing of a 5XW were in order. As it has only recently arrived i have not had time or opportunity to give it a whirl in the refractor or reflector, but weather conditions allowing hopefully in the next few days this will change. These eyepieces IMO are "keepers"  so should give me many years of enjoyment, what else could you ask for from a present at Christmas ☺

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On 01/01/2017 at 06:23, Louis D said:

It's been a week since Christmas.  How about some reports on new eyepieces received as gifts (or bought for yourself)?

To get things started, I received a 17mm ES-92 and have had a couple of chances to use it in both a coma corrected dob and a flat field short tube refractor.  It's easy to use with eyeglasses, has a very wide field of view that can be seen all at once without straining, is as sharp at the edge as a Delos (which is to say as sharp as at the center), has no discernable field curvature, and seems to have nearly constant angular magnification across the field.  The weight and size do have to be managed, but it is well worth the effort.  I haven't tried it without coma correction or flat field correction or with a barlow yet, so no reports on those aspects yet.

I measured the AFOV to be 92 or 93 degrees as claimed using reverse projection with a flashlight shining into the field lens.  Usable eye relief was measured to be 17mm using the same technique, so just a millimeter less than my measured 18mm for the 10mm Delos.

Overall, I'm so stoked, I hope to get the 12mm and other focal lengths as they become available.

Sounds very, very tempting indeed. I think I just heard my 17T5 Nagler shake in the EP case, but it is safe for now, as I have just blown all the spare cash on the eclipse trip

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18 hours ago, michael.h.f.wilkinson said:

Sounds very, very tempting indeed. I think I just heard my 17T5 Nagler shake in the EP case, but it is safe for now, as I have just blown all the spare cash on the eclipse trip

17T4?  If so, then yes, it's days are numbered.  It has no advantages over the 17mm ES-92 except size and weight.

So, are you heading to the States to the see the eclipse next year?  I plan on traveling north to see it.  I'm thinking Nebraska for its dry and clear weather in the summer and wide open prairies.

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1 minute ago, Louis D said:

17T4?  If so, then yes, it's days are numbered.  It has no advantages over the 17mm ES-92 except size and weight.

So, are you heading to the States to the see the eclipse next year?  I plan on traveling north to see it.  I'm thinking Nebraska for its dry and clear weather in the summer and wide open prairies.

The eclipse this year ;)

I will be visiting friends first in Indiana, and then yet more friends in Longmont, Colorado. That is about 2.5 hours drive from Orin, Wyoming which is as close to the centre line as it gets. I first thought I would go to Casper, Wyoming, but that is further away.  I will have to make a very early start on the 21st of August to avoid being caught in traffic, and have enough time to set everything up.

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I got two EPs with Christmas funds, both from members on here.

The Skywatcher Startravel 102 I also bought had no EPs with it and was my first 2" focuser. I wanted to go wide so the first EP was a Skywatcher Aero 35mm for £65.

It shows about 50% more than the Vixen NPL 30mm, and I love the increased afov of the Aero - don't know enough to evaluate it any more than that but it's definitely found a home with me for a while. I've bought an old 2" focuser for my DIY dob, in anticipation. :)

Below my Vixen NPL 30mm, I have a non-descript 80 degree 11mm with shockingly low eye relief and have never achieved sharp focus with it. Below that is a TMB Planetary II 6mm, but that's pushing the newt to the limit.

I came across an Andromeda 19mm flat field for £15, worth a punt. What a little cracker!

Bear in mind I have nothing to compare it to nor a clue when it comes to evaluating EPs but with a UHC filter in the dob (f/7.6) last night, I spent at least ten solid minutes on M42.

Bear in mind also that my dob currently shows unfocussed stars as a half-share of a doughnut, maybe the larger half but it's well out. Four pinpricks of the trapezium visible and sharp, clean to the edges, and more nebular detail than I've ever seen myself. Similar cushy feeling afov and eyecup of the Aero. Love it!

So I now have three EPs I care about, one to which I'm indifferent and half a dozen that may never come out again.

These two new EPs have made me want to do more visual. :D

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On 01/01/2017 at 15:37, Louis D said:

I wonder if these are the same as the Agena Astro BST Flat Field eyepieces made by Kunming United Optics as their FF series.

My 19mm looks exactly like these - seller suggested it would suit the slower f/7.6 of my dob - I'd say it does.

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