horseheadnebula

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?

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.

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.

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.

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.