Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_banner_christmas_presents.thumb.jpg.587637e0d01baf4b6d21b73610610bbb.jpg

AlexB67

Advanced Members
  • Content Count

    2,117
  • Joined

  • Last visited

  • Days Won

    1

AlexB67 last won the day on October 4 2013

AlexB67 had the most liked content!

Community Reputation

759 Excellent

4 Followers

About AlexB67

  • Rank
    Brown Dwarf

Profile Information

  • Gender
    Male
  • Location
    Bristol UK
  1. I recall this video from way back touching on the subject. I'll leave it to the cosmologist to elaborate. To me it seems to ask some more questions that leaves me scratching my head, but it is an interesting gedanken-experiment nonetheless.
  2. What I can say from experience that there is an observable difference with the 8mm BST I had versus a well corrected eyepiece such a TV Radian in my F4.7 scope, but you need good conditions to really find out, which I did few years ago. Back then Jupiter was high up in the sky, I used to do 2 - 4 hour marathons on that object alone. I could see the image degrade gradually. My viewing habit was to use around 2/3 of the view, then I would nudge the scope to get the best out of it. Also, IMO, as John said, it becomes a lottery anyway at that magnification.
  3. It depends if you are happy keeping away from the edges. In my experience with 8mm and 25mm. I only had the 5mm for a while years ago, but gave it away. They are not sharp over all the field at f4.7 , but it has been a while since I used them. Other than they give pleasant views IMO. From memory I also recall some field curvature resulting in out of focus stars the closer you got to the edges , perhaps the 25mm mainly. Sorry I can't help more since I am a bit vague on them at this stage. Note, I am a bit picky about aberrations, however at such high magnification ( I have never gone that high ) seeing will be quite blurry anyway. I never found it useful for planets to get out more detail.
  4. I am trying to focus. One thing I remember the lounge was very good is offering another 10 million options just at the point when a choice has been made, and also stretching your wallet, but then I did ask for it. but reading reviews is always fun.
  5. It had an encounter with an oily puddle (which had some nasty additives I guess) it wasn't the same after that even with cleaning, RIP . First accident I had with any eyepiece, hopefully last. Robin thanks, another distraction . I think I have made up my mind more or less ... F15 rules , it may have been you I bought it from coming to think of it ... small world. btw I love what they have done with the forum, kudos to those looking after it. I didn't post for many a year but never stopped stargazing. The forum seems a much quieter place now from what I remember.
  6. I had a chat with my telescope. My telescope says you only live once so buy what you want. I must say I enjoy the 60 degree FOV of my Radian and how it holds up across the field, The delite is a now stronger contender. I am sure if it is anything like my Delos optically, I suspect it is, it will indeed be a delite and I can pay homage to my long standing avatar. I am also fishing for a second hand 5mm Pentax XW if I can find one. In my heart I know anything TV or Pentax I bought to date so far, I will never sell. I am most proud of my Pentax XL 10.5mm since it a bit of rarity these days, and a great eyepiece. I did well to bag it years ago for a decent price, well less than half an XW 10mm new, one day it will be an antique.
  7. Now that the cat is out of the bag so to speak I will elaborate a bit in addition to the great post above. My other main reason for not using wide angle eyepieces is coma. For me if I went much wider than 70 degrees I would find it really bothersome, I don't mean it's like an on/off switch with a hard value of course, but it gets worse the further off-center you go. I would really want a coma corrector for the ultra wide angle eyepieces in an f4.7 scope, it is extra gear I rather avoid, I am happy with the smaller views anyways, as long as they good are sharp. For planetary viewing I find anything above 60 degrees plenty, I am quite used to nudging with a 40 degree ortho, though admit it can get a bit tedious at times.
  8. I had great views of faint planetary nebulae with the 6mm Radian where I thought it might struggle, it is a strange beast in some respects, The edge to edge views are superb as with all TVs. In my experience, which is not nearly as great as yours of course, When I compared my 8mm radian on m57, even the 8mm BST has a tiny bit more pop, as well as stars. doubles etc. On jupiter, it is almost as if there is a subtle filter, for that particular application I really love it, I think it also depends on wavelength, so result vary. I even did a little review here way back. In any case, I would not call it neutral, OTOH the 7mm pentax XW in contrast is as if there is nothing in the way ... at all. I don't know what generation optics/coatings mine are. All bought for around £100 , no regrets despite what I said above, great eyepieces that brought me much pleasure. Nothing is perfect
  9. I am an idiot, I never realised that it could be locked into place, I forgot about it over time. In fact, I just took it out and indeed confirmed it can be very solidly locked into place via rotation. I always had in a semi stiff position and used it like that just sliding into position ever since and forgot over the years My score for that mechanism has now gone up tenfold. It never prevented great views mind. If the like button had a double trophy I would give it to you. I think the delites are designed like this too correct ?
  10. The SLV is a strong contender, your are all making a strong case, plus, I like bang per buck views I'll let you know when a purchase has been made, but don't let that stop anyone making further suggestions. The only a negative I heard on the FLO website is a claim that the FOV is somewhat narrower than 50 degrees, more like 45, but that's not critical for me. The BGO was 40 degrees, and your eye has to be right up against it to see all of it.
  11. I agree, but there other factors too, I wouldn't say one is an incorrect or correct choice, depending on the situation, and what you want, but I didn't want to bias the OP either way. I think there are pros and cons one can argue for in either direction in a fast scope.
  12. Thanks, I've been eyeing it up, hmmm, perhaps for a bit less 3rd hand even if it is as new. I have bagged pentax XW for less I've been out of the latest developments reading reviews for a few years, so I don't know about the latest and greatest. That aside, a new TV delite is almost as expensive as a pentax XW 5mm at FLO. Given the choice I think I'd pick that new, but never tried a Delite. I do have two radians, 6mm and 8mm, as much as I love them for some objects, the so called Radian warmth and weaker throughput is noticeable, reading around, the delite seems to get positive reviews in that regard, and that issue has been addressed. In the shorter focal length however, I am a bit of a pentax fanboy from experience, for various reasons, when all things considered, not just views, but comfort, eyecup design etc. My Delos adjustable eye guard is rather prone to moving around, on one radian I have it is much stiffer. I prefer that, but on the other one it slides more easily. It isn't a big deal, it doesn't bather me during viewing, but outside of that, knowing the position I prefer, it is easy to forget where it was positioned in the dark once it does move. I prefer the Pentax design in that regard, it stays put.
  13. Thanks. I'll have a look, mind you, the SLV is cheap enough, I don't mind. I have a few weeks before I go on holiday to ponder
  14. MSammon, congrats on your eyepiece. I'll be interested to hear too. I addressed this in a different way in a scope the same as yours 10 inch F4.7. I have a Maxvision 28mm 68 degrees, this covers the same amount of sky as a ES 24mm 82 degrees ( roughly, top of my head, i think this is correct) . I do not wish to bias your opinion on the pros and cons of each however and see how you get on. I find it interesting that people often pick the wider FOV, as opposed to the net result of a longer focal length eyepiece with smaller FOV showing the same amount of sky.
  15. I just literally just found your review and read it , thanks John, great write up. Sounds promising. With 7 elements I would expect them to behave fairly well edge to edge over that FOV ... I suppose. I think I'll just bite the bullet and give the 5mm a go before I talk myself into another pentax XW 5mm.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.