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About horseheadnebula

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  1. Thanks again Louis! I really like your writing style, very informative! I should buy you a beer :D You are right, I should slow down and enjoy my purchases. I actually have had this telescope several years already. My initial enthusiasm for observing faded few years ago because I only had two usable eyepieces, I was missing some necessary accessories and I didn't have money to invest into hobby. Maybe I should have mentioned this in beginning of this thread but my writings were already quite long and I was afraid that nobody would read long texts these days. But because of Covid and topical Mars, I got spark into observing again. I learned something from my initial experience few years ago. That's why I included observing chair into shopping list. Many observing nights had been cut short just because of bad ergonomy. Another thing was that I didn't found objects from sky, eventhough I know stars and constellations visible to the eyes quite good but it was another story to find deep sky objects with telescope. That's why I included Rigel finder into shopping basket. Intelliscope acually have star catalog and push-to system. But somehow I felt it was terrible inaccurate and display of controller just freezes to unreadable in below zero conditions so I just gave up using it. Today I read from Cloudy night forum that two star allignment need to do very accurately and crosshair eyepiece with high magnification is recommended. I realized that this most likely have been my problem for inaccuracy and I would like to give another chance for object locator. Don Pensack mentioned that you don't need illuminated crosshair. Just "defocus the alignment star until it's a donut shape. The bright disc will display the crosshairs easily...Easy and cheaper than an illuminated eyepiece...Plus, it's focusable, so I can make the crosshairs sharp for my eye...Cost only about $ 40." I have tried to search hours this kind of cheap crosshair eyepiece Don mentioned but didn't found one. Does anyone know?
  2. Thank you very much for helpful answers! Based on your recommendations I will buy Omegon Redline SW 22 mm and Morpheus eyecup for that. Nagler Nagler T4 22 mm certainly would have been super but if you say Redline is almost as good but costs 1/4 of Nagler it was difficult to justify buying Nagler. High power side is still bit unclear. Now Firstlightoptics seems to have one Pentax xw 5 mm in stock so I was thinking to buy that. Though I have understood that sky needs to be calm (good seeing etc) to able use 240 x power. Couple stupid question but is this also true for very bright objects like Moon and Mars for which I would buy 5 mm eyepiece? I'm bit concern that would I actually have many good enough nights to oberve. Also if magnification rise, do I need some Moon filter or does brightness only depends on mirror size (I would think it only depend on main mirror)? How would you fill the gap between my 8 mm Delos and Pentax 5mm (150 x and 240 x)? Is that Morpheus 6.5 mm (185 x) dump idea? Or better to save money and buy 6 mm Delos later? Another possibility is buy Explore Scientific 2 x tele-extender and get 6 mm from ExSc 92 12 mm which I already ordered but haven't got yet. Is there some accessory you would recommend? I was thinking for example some Baader Clicklock but not sure which one I would need. At the moment my shopping basket contains: Omegon Redline SW 22 mm Omegon observation chair Rigel finder Baader Morpheus foldable eyecup Pentax xw 5 mm Premium cheshire collimating eyepiece These already exceed my original budget but there seems to be many important things to buy so it not so serious.
  3. There was second hand Explore Scientific 92 12 mm in 'For sale' channel. Seller thought that focuser can easily support 1-2 kg and should not be any problem. Instead telescope balancing might be issue. So I made scientific test and placed 1 kg bottle of milk near the focuser. For me it seemed that there wasn't any balancing problem and brake holds so I dared to buy that. I'm 39 years old. According to Tele Vue's guide (https://televue.com/engine/TV3b_page.asp?id=54&Tab=_Choose) my eye pupil size would be 6 mm. Does this means that I would see shadow of secondary mirror (or some other problem)? If not, 30 mm APM could be good temporary solution until I could get Nagler T4 22 mm. Do you mean that eye cup should be screwed off from 22 mm Omegan Redline to have enough eye relief for glasses? I think I would hesitate to do that because I would be scare to get scratches on my eye glasses. Otherwise this sounds good specially considering it wouldn't so expensive. Do you happen to know field stop diameter so I could calculate true field of view? Meade HD-60 seems to be out of stock everywhere. Thanks, I'll take your advice about wide field. At least I can drop Vixen SLV off the consideration list. Hmm, you would think I would lose only 6 degrees with eyeglasses with Morpheus 6.5 mm? Then this could be good choise. Is magnification too close to my 8 mm Delos? 150 x versus 185 x? I was also considering Pentax xw 5 mm but now it seems to be out of stock in Firstlightoptics and elsewhere it costs about 90 € more.
  4. Thank you very much of your detailed and helpful answers I think I got field stop size now. Field stop size is like diameter of CCD but now we have circle and that 1.414 is actually square root of two. Don's advice about focal lengths and magnifications was very useful, I'm going to follow that. I looked eyepieces you all suggested. For 12 mm Explore scientific 92 seems very tempting but I'm concerned about it's weight. Does anyone know is my telescope able to handle it? If not, I guess APM 12.5 Hifw would be my choice. Don's mentioned 24 mm seems to be tricky. It appears that there isn't actually any 24 mm eyepiece with enough eyerelief. Closest I believe is Televue 22 mm nagler type 4. I think I have to look second-hand market for these. Generally what would you ask from seller? Perhaps some pics to see that there is know any scratches in glass. Too bad Morpheus eye relief is tight in 6.5 mm. I have to look something more expensive here unless Vixen SLV is solution. How important big field of view is with high magnification with non-tracking telescope? I can image it might be important if/when target moves quickly though eyepiece. I checked that there is actually eyepiece for 4.7 mm focal length: Ethos (second-hand) For this tiny exit pupil I would not need glasses or Dioptrx (cyl 1.0 & 1.5), hmm. But not sure would it be practical to wearing glasses on-off. Pentax xw or Delos would be more realistic, I think.
  5. I have Orion XT10 intelliscope (1200 mm focal length / 254 mm mirror / f 4,72) with two Orion Sirius plossls (10 mm and 25 mm) which came with the telescope and Televue Delos 8 mm eyepieces. I also have Lumicon UCH 1.25" filter but so far haven't found any use for it. Besides these eyepiece I only have tried Baader Aspheric but I was really surpised about it's poor image quality (astigmatism) specially considered it's price. So for my first eyepiece I wanted more quality and bought Delos. I'm wearing glasses so I would need long eye relief eyepieces. My 10 mm plossls is useless for me. I'm practically blind without glasses so I would like to use glasses all the time instead wearing them on and off with high magnification. I would need help to decided next eyepieces. My budget is somewhere 600-700 €. Problem is that because I only have experience about mentioned eyepieces, I don't know what I actually want. Moon and Messier 13 have been my favourite targets. I never would have guessed Moon would be so nice with telescope. So perhaps another eyepiece could be with more magnification to see more details from Moon and to see topical Mars as a larger. I have read positive feedback about Baader Morpheus but I'm not sure is eyerelief too tight with 6.5 mm and is that focal length too close to 8 mm Delos. If eyerelief is not enough there would be Vixen SLV but is it's apparent field of view too tiny with non motorized dobson? With other eyepiece I would like to enlarge my hobby to more deep sky objects. I don't even know what would be ideal focal length but I have understand it could be somewhere between 12-20 mm. If I'll buy cheaper higher magnification eyepiece (like Morpheus or SLV) I would stay on budget with Explore Scientific 92 or another Delos. Is that ES eyepiece too heavy so that can my focuser handle it? Is this right plan to concentrate more money in this focal length area? Then I read from Televue's choosing eyepiece guide that it would be nice to have eyepiece for low-power viewing of large objects. (Generally I didn't understand guide's section how to choosing eyepiece based on field stop sizes.) This eyepiece would be about 30 mm focal length. Though I have understood from other 'help to decide eyepiece' topics that this probably is not must have focal length area. For this I have looked 30 mm APM ultra flat field but I'm not sure about eyerelief. I have also looked APM hi-fw 12.5 mm for dso but again I have read mixed reports of APM's eyerelief sufficiency for glasses.
  6. Ok. Thanks for clarification. Nikon sounds bit challenging eyepiece but I bet views are rewarding.
  7. Thanks for your response. I ordered 8mm Delos. It helped the decision that there is bit discount on Deloses in http://okularum.eu. bomberbaz, good to know that eye relief in Nagler 26mm and Nikon 17hw is enough. I would have assumed 16mm eye relief is bit tight with spectacles. Not that I could afford for Nikon but I could looking for second hand Nagler.
  8. Thanks Axunator for pointing out okularum tip/link! I also ordered Delos 8mm. My first eyepiece besides two plossls which came with the telescope. Michael, you didn't like Morpheus after all? Is there big difference between Delos and Morpheus?
  9. Four months and still undecided :S Many of you who have posted in this thread seem to have 8mm and 12mm rather than 10mm eyepieces for 10 inch dob. Would 8 and 12mm be better "base line" than 10mm and 14mm? If using 1,4x factor rule and one would have 12mm eyepiece he would get 6,1mm - 8,6mm - 12mm - 16,8mm and 23,5mm focal lengths eyepieces. Now if I add 17mm eyepiece and 2 x tele-extender I would get 6mm - 8,5mm - 12mm and 17mm. Then some 24-31mm. Sounds like a plan? Let's say if I had 92 degree apparent field of view with new Explore Scientific 12mm ocular and barlowed to 6mm, it would have 0,46 degree true field. Would it make any sense to buy for example 7mm pentax xw with 70afov? It would have less true field (0,41degree) than 6mm ex.sc (or same true field than barlowed 12mm nagler with 82 afov). Maybe I should add that probably I have enjoyed most to watch globular clusters. Would that 8,5mm be too much for M13? So should I consider 10mm after all? Anyone have experience about new Explore Scientific 92 degree eyepieces? Looks very promising with decent eyerelief. Atleast in Cloudy nights forum there is some hype. Only quite expensive. http://www.bresser.de/en/Astronomy/Accessories/Eyepieces/Explore-Scientific-92-LER-Eyepiece-17mm.html?listtype=search&searchparam=92 http://www.cloudynights.com/topic/528192-new-explore-12mm-92-degree-is-in-game-changer/
  10. Thanks everyone from answers. Seems quite hard to decide which focal lengths would be best. There is lot of good focal lengths between 8-17mm but I think I settle on 10mm and 14mm. I also emailed to Firstlightoptics and Steve suggested these FL. I would get with 2 x focal extender: 14mm / 7mm = 85x, 170x. (2,96 exit pupil with 14mm) 10mm / 5mm = 120x / 240x. (2,11 exit pupil with 10mm) Those new Baader Morpheus EPs looks promising. Still probably would be wise to wait John review and decide after that which 14mm I´ll buy. I have read that 14mm Pentax xw would have some field curvature. How bad it is actually? Is it reason not to buy it? At the moment in my shopping basket is Pentax xw 10mm Rigel finder Premium cheshire Celestron Lens pen Either Bresser SA barlow or Explore Scientific 1.25" 2x focal extender Star map I think it is good starting packet and will buy other EPs later. Yes it is 2" Ep and that's why I decided to not to buy it. For some reason I have bought second hand 1.25" Lumicon UHC filter and wanted to use it with new EPs. Even though I haven't really seen anything with it but wanted to give it second chance with better EPs. Also it would be cheaper to buy 1.25" than 2" focal extender. But that second hand 17T4 was sold quite cheap price so hopefully my decision wasn't bad.
  11. Sounds like all are nice eyepieces. Do you mean that Delos isn't parfocal with Pentax xw but 17T4 is (at least somewhat) parfocal with Pentax? Would that Pentax xw 10mm be good choice for first eyepiece? And how about if I order two? Is 10mm and 17mm better pair than 10mm and 14mm (along with somewhat usable 25mm plossl)? I could also buy 2 x focal extender and also get 5mm and 7mm or 5mm and 8,5mm. You are probably right that Dioptrix would be better than glasses but I'm practically blind without glasses and need them while reading star charts etc. Though it would be nice to try it with Explore Scientific 100 degree eyepieces and feel the spacewalk experience! I have read that someone use dioptrix with those and ES eyepieces wouldn't cost Ethoses. But I don't know how practical this kind of system is.
  12. I have had Orion XT10 intelliscope (1200mm focal length / 254mm mirror / f 4,72) over a year now with two Orion Sirius plossls eyepieces (10mm and 25mm) which came with the telescope and now would be time to upgrade new eyepieces. 10mm plossl is useless for me as I need to wear eyeglasses due to astigmatism. So I badly need new eyepiece in higher magnification area. 25mm is somewhat usable, I cannot see entire field stop, if it is right term, unless I push eye and glasses onto eyepiece which means glasses might get bit dirty. Manufacturer list on their website that 25mm eyepiece have 16,9mm eyerelief so it would be nice to have couple mm more eyerelief. Right after I bought this telescope I borrowed some Baader Hyperion & Aspheric and Orion Epic eyepieces. Back then I was totally newbie with telescopes and eyepieces but noticed that Hyperion was comfortable to use but Aspheric had horrible views around the edges. Later I read that it is some sort of aberration, maybe astigmatism. This was surprise as Aspheric is quite expensive eyepiece. So I started to read information about eyepieces and ended up into this very nice forum and looked eyepieces like Pentax xw and Delos. As with student budget I'm not exactly rich but I think that quality eyepiece would get years of use so I could buy one or two good eyepiece per year. Atm my budget would be couple eyepiece in Pentax / Delos price range. I read somewhere that eyepiece with 2mm exit pupil would be most versatile eyepiece. Is it so and would it be good focal length for first eyepiece? If it is then many have praise 10mm Pentax xw and that would be probably best in xw series. But in longer focal lengths some other manufacturer would be better. And if 14 or 17mm would be more practical all-rounder Delos might be good choise. So I guess my question is which one or two focal lengths would be best starting point? It might be that I order one eyepiece at first and look how it performs. I have also looked astro buy & sell site. At the moment there would Vixen LVW 5 & 8 mm and Vixen SLV 6mm. Those seems to be good eyepiece as well and are parfocal with Pentax xw (which is very nice) to my knowledge. There is also Televue nagler 17mm type 4, even 17mm eyerelief is bit tight and it might be annoying to have 1,25" and 2" format but second hand it wouldn't be so expensive. Also there is Pentax xw 5mm but even it would be nice pair with xw 10mm maybe it is too much magnification and less usage. This is more theoretical speaking as I haven't checked yet would any of them send outside to UK.
  13. Looks promising. Can't wait to see John's review.
  14. Does others have similar experience or is this individual case? Is this anything to do with ES Europe has nice discount for it? Price start to be tempting and I have considered to buy it. At least CN link that Ruud posted author reviewed ES 68 similar or even better than Panoptic.
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