Search the Community
Showing results for tags 'astigmatism'.
Found 3 results
Does anyone test their eye pieces using artificial stars, either home made, or commercial such as the Astrozap? One way of testing optics when there are no stars, and when out and about maybe. I presume astigmatism and lens edge performance would be shown up.
Ok think I have mentioned about this before but tonight I have spent time doing nothing other than testing this out on stars clusters and doubles and results are excellent so I thought I would post a brief review. For any astigmatism afflicted viewers like me these adaptors are a godsend. They correct the abnormal shape in our eyes, doing away the need to wear your specs and open up a whole new world as far as viewing is concerned. I went this way because it is cheaper than paying £4000-£5000 for surgery to correct this, That said my collection in my sig below goes a fair way to getting there Back to the results. After much turning and twisting of the Dioptrx to find the absolute perfect position which in my case is between A and B marked on the rim at 12 o'clock, I went on a tour of various clusters, a few doubles and then just panned around the sky looking at constellations. This is for me, a glasses wearer such a revelation, liberating even. To be able to see stars as pinpoints of light accross most of the FOV rather than seagulls due to the shape of my glasses lens was just brilliant. Especially using the Nikons and actually getting to drink in all that fantastic FOV that comes with this EP. They also fit a few other EP's that are available much cheaper so you don't have to spend a small fortune like I did if you want to take advantage of this wonderful adaption from televue. Vixen LVW are one make but I believe it is the size of the top of the eyepiece without a guard on it. Anyway, finalkly I have nailed using these and I am looking forward to SGL12 for some great deep sky viewing. Steve
Gents, Ladies, please don't laugh (you can gloat of course), but I'm getting acquainted with a new FSQ106ED. At the same time, I'm testing a GM1000HPS (still...) Odd star shapes have occasionally come with the territory so far with this mount, but I had some very strange results with the 'new Q'. The long and short of this, is that I've discovered that slightly out of focus stars are elongated in one direction, and this direction swings thro 90 degrees when I go from intra to extra focal positions. The fully defocused star images look round enough, but this is really disappointing. I'm just hoping someone can reassure me that this is not normal, and that I should get it replaced rather than just refunded. I know Ian K will look after me, his service is always excellent, just want to make sure it's not just me that thinks this isn't good enough. Any advice welcome, Jack