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Thread: Optimal Televue Delos size to get

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    Default Optimal Televue Delos size to get



    The next eyepiece I am planning to get is a Televue Delos and the question I have is, what is the optimal size?

    I have a Barlow, an Apertura 30mm, a Zhumell 12.5mm and a Zhumell 5mm and SuperPlossl 9mm (useless because of short eye relief as I wear glasses). The Zhumells are very good for planetary viewing, but their FOV is only 55º, which I think is too small for DSOs, although the Orion Nebula looked pretty nice using the 12.5mm.

    So going back to the Delos, for DSO viewing, it looks like the only two sizes that make sense are the 17.3mm and the 14mm, maybe the 12mm, but it's probably better to have a magnification not covered by the other combinations.

    I know this is highly personal of course, but thoughts on the size I should look for would be appreciated. It will be a while before I will get any other eyepieces after this one (and some time before I even get this one), so I would like to get the most bang for the buck and be most efficient in my selection. Also, when the next TV deal comes out, I will be ready with my choice.

    Thanks.
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    Telescopes: Apertura AD12 12" Dobsonian; Eyepieces: Superview 30mm, 68º AFOV, Eye-relief=22mm; Pentax XW10 70º, Eye-relief=20mm, Zhumell-Z Planetary 12.5mm, 55º FOV, Eye-relief=20mm; ES 82º 8.8mm, Eye-relief=15.6mm; Apertura 2" 2X Barlow; Accessories: Telrad, Moon Filter, DGM NPB 1.25" Nebula Filter


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    Default Re: Optimal Televue Delos size to get

    Going solely on what you have now, and what you want to buy (Delos), I would say the 17.3 fits better into the scheme. Since you have a barlow, you now have 30mm (15mm), 12.5 (6.25), 9 (4.5mm) and 5mm (2.5mm). I think you are saturated at the shorter end of the scale. Unless you simply wish to replace the 12.5 with the 12mm Delos (6mm barlowed), then the 17.5 fits into the large void you have between 30mm and 15mm (barlowed 30). Even so, at some point, I would also look for something in the low to mid 20mm range.

    As you said, it is your own choice ultimately. But if faced with the same decision, based strictly on the criteria you have set forth, that is what I would do personally. It might not be what I would do in reality, but again, I am basing that on the factors you've set.
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    Default Re: Optimal Televue Delos size to get

    Quote Originally Posted by technomaget View Post
    The next eyepiece I am planning to get is a Televue Delos and the question I have is, what is the optimal size?

    I have a Barlow, an Apertura 30mm, a Zhumell 12.5mm and a Zhumell 5mm and SuperPlossl 9mm (useless because of short eye relief as I wear glasses). The Zhumells are very good for planetary viewing, but their FOV is only 55º, which I think is too small for DSOs, although the Orion Nebula looked pretty nice using the 12.5mm.

    So going back to the Delos, for DSO viewing, it looks like the only two sizes that make sense are the 17.3mm and the 14mm, maybe the 12mm, but it's probably better to have a magnification not covered by the other combinations.

    I know this is highly personal of course, but thoughts on the size I should look for would be appreciated. It will be a while before I will get any other eyepieces after this one (and some time before I even get this one), so I would like to get the most bang for the buck and be most efficient in my selection. Also, when the next TV deal comes out, I will be ready with my choice.

    Thanks.
    Well, this is my personal opinion so take it easy.
    You want an upgrade, not just diversification of your EP collection. Since the Delos is a premium eyepiece which is optically way better than the others you have, it will be a major upgrade for a long period of time. IMO, in this situation you shouldn't think too much about what you've got already because you want dramatical improvement in quality of view rather than anything else, like just simply wider AFOV.

    IMO, for DSOs in f/5 Dob you may need first something around 10-14mm. You are saying the 9mm Plossl is useless due to short eye relief. I understand that, and even though I don't wear glasses when observing I never ever used it (I got with my Z8 same stock eyepieces as you). So you can get the 10mm Delos that'll give you 2mm eye pupil and ~0.5* TFOV. But, of course with the 2x Barlow it will duplicate your 5mm Zhumell Z. Well, you scope has relatively long focal length so the TFOV will be quite narrow.

    Another option can be the 14mm Delos, that gives you ~3mm eye pupil which is good because you can use it with dense nebula filters like OIII. And quite good 0.7*TFOV at ~109x. Combined with the 2x barlow it also gives the 7mm *virtual* eyepiece for 218x that should be not bad for planets. And I wouldn't even consider the 30mm Superview+2x Barlow, it's not an exciting quality eyepiece for serious observer with a fast f/5 Dob, IMO!

    You can buy the used Delos on A-mart or CNC just for ~$250 and sometimes even cheaper. There are a plenty of them popping up almost every day in classifieds. Since it most probably will replace any of you Zhumells (12.5mm or 5mm) you may want to sell that Zhumell out as well as the 9mm Plossl for even more savings.

    I also consider an upgrade like you planning on the 12mm Delos. If I get it some day I'll probably have to sell out my 14mm Meade 5K UWA since it'll become redundant.
    j.gardavsky and technomaget like this.
    Zhumell Z8 8" f/6 Dob; Meade 2090 90mm Achromat.
    DSO setup for the Dob: 32mm Agena SWA, 20mm ES68, 18mm & 11mm ES82, 14mm & 8.8mm Meade 5K UWA, 12mm TV Delos, 6.5mm Meade 5K HD-60. Planetary setup: 6mm & 10mm BCO, 8mm RKE, 7mm Antares Ortho; RO Zoom 7-20mm; 1.25" 2x Meade TeleXtender, 2" 2x AT ED Barlow.

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    Default Re: Optimal Televue Delos size to get

    Well, I just got the Zhumell eye pieces and I believe from other forum posters and the reviews I've seen, they're excellent eyepieces. Their AFOV is just 55º, which is the main problem for DSO viewing. But your suggestion of the 14mm is something I would consider. Still, I think if I had to get one, it would be the 17.5mm since that is an area I have nothing and as you said, the 30mm Superview is not the best eyepiece. Also, the 17.5mm barlowed would be close to the 9mm, which replaces an unusable eye piece anyway.

    Regarding getting a used Delos, I get email postings of all eye piece sales from Cloudy Nights and the lowest I've seen for a Delos so far is $260. Astromart requires money to join and I can't see doing that unless the prices are significantly lower than Cloudy Nights.
    Telescopes: Apertura AD12 12" Dobsonian; Eyepieces: Superview 30mm, 68º AFOV, Eye-relief=22mm; Pentax XW10 70º, Eye-relief=20mm, Zhumell-Z Planetary 12.5mm, 55º FOV, Eye-relief=20mm; ES 82º 8.8mm, Eye-relief=15.6mm; Apertura 2" 2X Barlow; Accessories: Telrad, Moon Filter, DGM NPB 1.25" Nebula Filter


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    Default Re: Optimal Televue Delos size to get

    For the price the Zhumell Z (LERs) are really very good medium level eyepieces. To be precise, their AFOV, at least in the 12.5mm, should be around ~57*. I did several shootouts and posted my brief report somewhere here. The Meade 5K HD-60s (and probably Celestron X-Cel LX and AT Paradigm) are better in all aspects than the LERs. The ES82/Meade 5K UWA and ES68/Meade SWA are better than HD-60, etc...Of course your mileage may vary.

    I'm a member of both A-mart and CN since 2007. I've collected over 2 dozens of the used eyepieces and only 2-3 came from CN. CN is a small market, just few new offers a day as compared to A-mart. And A-mart is really safe marketplace. So for me this $15 yearly fee pays off. Most of prices for A-mart items are available from classified headers only so you can get them after you've logged in, that's probably why you haven't seen best offers. And I saw there Deloi offered even cheaper say ~230 or so, but of course best deals go pretty fast, so you need to act immediately, sometimes it's like an auction
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    Zhumell Z8 8" f/6 Dob; Meade 2090 90mm Achromat.
    DSO setup for the Dob: 32mm Agena SWA, 20mm ES68, 18mm & 11mm ES82, 14mm & 8.8mm Meade 5K UWA, 12mm TV Delos, 6.5mm Meade 5K HD-60. Planetary setup: 6mm & 10mm BCO, 8mm RKE, 7mm Antares Ortho; RO Zoom 7-20mm; 1.25" 2x Meade TeleXtender, 2" 2x AT ED Barlow.

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    Default Re: Optimal Televue Delos size to get

    I have to agree with the above posting made by CloudyNight...

    I buy and sell a ton of astrostuff .... and that 15 bucks you spend on joining Astromart is well spent...mainly because Herb Your just runs that place with an iron fist and any seller or buyer who misrepresents an item or who fails to complete a sale etc is simply banned forever...

    The buyers and sellers on that site just know the real value of astrogear...you will not get any steals but what you will get is a very fair price
    and you will receive an item that completely matches the description

    That said...Why Delos... ???? Why not Nagler ??? why not Panoptics ..??? why not Pentex ??? or why not Explore Scientific...???


    The Delos eyepieces are very very good...but if you like your Zhummels heck almost any medium to higher grade eyepiece should be to your liking ....

    Bob G
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    Default Re: Optimal Televue Delos size to get

    Quote Originally Posted by Bob327 View Post
    I have to agree with the above posting made by CloudyNight...

    I buy and sell a ton of astrostuff .... and that 15 bucks you spend on joining Astromart is well spent...mainly because Herb Your just runs that place with an iron fist and any seller or buyer who misrepresents an item or who fails to complete a sale etc is simply banned forever...

    The buyers and sellers on that site just know the real value of astrogear...you will not get any steals but what you will get is a very fair price
    and you will receive an item that completely matches the description

    That said...Why Delos... ???? Why not Nagler ??? why not Panoptics ..??? why not Pentex ??? or why not Explore Scientific...???


    The Delos eyepieces are very very good...but if you like your Zhummels heck almost any medium to higher grade eyepiece should be to your liking ....

    Bob G
    The only ES with enough eye relief I could get is the 30mm so I would definitely keep that as an option, but I wanted something mid range that has a wide field that also enables me to get higher magnification on DSO's. For example, I liked the look of the Orion Nebula in the 12.5mm and saw more of the nebula structure than in the 30mm.

    Naglers are for lower mags than Deloses are, I thought. Plus I read somewhere on Cloudy Nights that Delos optics are even superior to Nagler optics. And it's not like the Naglers are any cheaper. And the Naglers have insufficient eye relief for me. Panoptics have a slightly lower field of view and my understanding from all the comparisons I have read is that Delos is superior. I am not sure of the eye relief on those, but last time I looked at the chart on the Televue site, Delos had the consistently high eye relief I needed and most of the others didn't.

    Regarding Pentax, I understand those to be on parr with the Delos, but the same is true of their price, which actually seems to be a bit more. I don't think I would turn down a good deal on a Pentax, but I haven't researched them as much I have to say.
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    Telescopes: Apertura AD12 12" Dobsonian; Eyepieces: Superview 30mm, 68º AFOV, Eye-relief=22mm; Pentax XW10 70º, Eye-relief=20mm, Zhumell-Z Planetary 12.5mm, 55º FOV, Eye-relief=20mm; ES 82º 8.8mm, Eye-relief=15.6mm; Apertura 2" 2X Barlow; Accessories: Telrad, Moon Filter, DGM NPB 1.25" Nebula Filter


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    Default Re: Optimal Televue Delos size to get

    Oh, and thanks for the info on Astromart. Based on both of your recommendations, I may join. It really depends on how much used stuff I intend to purchase. For example, I'm also planning on getting a UHC filter and I will probably just buy that new for $75. So unless I am planning on getting more than one eyepiece, it still may not make sense to do it through astromart unless the price is even lower than the $230 (e.g. $215 or less).
    Telescopes: Apertura AD12 12" Dobsonian; Eyepieces: Superview 30mm, 68º AFOV, Eye-relief=22mm; Pentax XW10 70º, Eye-relief=20mm, Zhumell-Z Planetary 12.5mm, 55º FOV, Eye-relief=20mm; ES 82º 8.8mm, Eye-relief=15.6mm; Apertura 2" 2X Barlow; Accessories: Telrad, Moon Filter, DGM NPB 1.25" Nebula Filter


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    Default Re: Optimal Televue Delos size to get

    Quote Originally Posted by technomaget View Post
    The next eyepiece I am planning to get is a Televue Delos and the question I have is, what is the optimal size?

    I have a Barlow, an Apertura 30mm, a Zhumell 12.5mm and a Zhumell 5mm and SuperPlossl 9mm (useless because of short eye relief as I wear glasses). The Zhumells are very good for planetary viewing, but their FOV is only 55º, which I think is too small for DSOs, although the Orion Nebula looked pretty nice using the 12.5mm.

    So going back to the Delos, for DSO viewing, it looks like the only two sizes that make sense are the 17.3mm and the 14mm, maybe the 12mm, but it's probably better to have a magnification not covered by the other combinations.

    I know this is highly personal of course, but thoughts on the size I should look for would be appreciated. It will be a while before I will get any other eyepieces after this one (and some time before I even get this one), so I would like to get the most bang for the buck and be most efficient in my selection. Also, when the next TV deal comes out, I will be ready with my choice.

    Thanks.
    I am thinking if you have your hear set on a Delos and don't mind using the barlow, then the 17.5mm makes sense....You have a decent finder ep @ 17.5mm plus with the 2x barlow it replaces your useless 9mm super plossl- you can sell it.......the 9mm EP focal length is one I have very frequently found to be very useful....

    I have no experience with the TV Delos ep's, but I know I miss the ES 18mm 82* series I had and sold....It was awesome....
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    Default Re: Optimal Televue Delos size to get

    Quote Originally Posted by MoosBros View Post
    I am thinking if you have your hear set on a Delos and don't mind using the barlow, then the 17.5mm makes sense....You have a decent finder ep @ 17.5mm plus with the 2x barlow it replaces your useless 9mm super plossl- you can sell it.......the 9mm EP focal length is one I have very frequently found to be very useful....

    I have no experience with the TV Delos ep's, but I know I miss the ES 18mm 82* series I had and sold....It was awesome....
    This is probably a dumb question and the answer is probably "Upgrade", but why did you sell your ES 18mm?
    Telescopes: Apertura AD12 12" Dobsonian; Eyepieces: Superview 30mm, 68º AFOV, Eye-relief=22mm; Pentax XW10 70º, Eye-relief=20mm, Zhumell-Z Planetary 12.5mm, 55º FOV, Eye-relief=20mm; ES 82º 8.8mm, Eye-relief=15.6mm; Apertura 2" 2X Barlow; Accessories: Telrad, Moon Filter, DGM NPB 1.25" Nebula Filter


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