hi, a question about barlows/extension tubes. (thanks to whitney for the ideas and rather than pester you more i thought i better email the group this time.) ...
... Due to the limited focus travel of your Dob focuser most likely you won't be able to reach focus after adding the extension tube. With a refractor the...
thanks phil....one downside of a newt! is the 2.5x powermate much better than the far cheaper televue 3x barlow? )sorry this is real important as i have real...
Hi All, Last night there was good seeing so I grabbed my webcam to do some star testing on my Orion ST80 and I've posted an intra-focus image of beta lupii to ...
hi again, oops, a correction to my previous post (why are laptop keys so small). The link *should* have read ... http://www.astronomy.za.net/st80/startest.jpg ...
hi sorry, i can't offer any advice as per your star test, just wondered how you caught the image? i try star testing and i just get a star, then an out of...
... I'm not sure that this is the typical triangular pattern of pinched optics. To me only the lower part of the pattern is distorted. It could possibly come...
Hello to all of you, and thanks for providing so much good information on these scopes and on astronomy in general. I'm a first time telescope buyer and...
Hi Chris, I am also fairly new to the 80f5 having bought a used one as a second scope a few months ago. I found Bob Berta's tune up tips (reposted on this...
Hi All, Sorry, I should have mentioned how I obtained my image - I took a short sequence of about 100 1/50th sec exposures at prime focus with a Phillips...
I just saw an announcement of a new series of Vixen products including a new 80f5, a new mount called the "Sphinx", and a new LCD screen starchart controller...
I know this message is a little old now, but I didn't notice anyone suggesting something. If you put the barlow "in front of the diagonal" you should pick up...
... With my Orion shorty-plus barlow, I needed a tube-extender to reach focus when the barlow was placed before the diagonal. This is on both a Celestron and...
In addition to the problem with reaching focus, my barlow is very short and not secure when placed in front of the diagonal. I've decided to buy the Antares...
Real quick, see if they will trade the ep for at least anoth as it sounds like it has flaws. If they would change it for a 12 or 15mm, then all the better...
hi all. i recently posred re x barlows and it seems that the televue is a good bet... my friends are hloidaying in thr states so i can save about 33% of the...
Had the chance (using my Orion Observer 70) to compare the amount of false color that was visible at the edge of the Moon using Kellners, Plossls, and ...
... I'd buy the Barlow as it is much more versatile. Also I can't leave aside the issue of eye relief on the 4.8mm Nagler, it is that short! Even if you were...
... The easy fix it to place a LASER beam collimator in place of your diagonal and see if the beam exits the center of the objective lens. Rack the draw tube...
Hello, Mine is perfectly centered. Look at the top of the focuser assembly and you'll see two tiny holes with very small allan key screws in them. Get an allan...
thanks for the advice, i have decided on the tv 3x barlow. it is very tempting to actually own a nagler, and for around $120......high power with big wide...
... I've swapped orion shorty and shorty-plus barlows in my 80F5, and I couldn't detect any difference. Maybe because there's already so much color. ... The...
... From: "Phil Lefever" <kb0nes@...> Subject: Re: [80f5] questions, please help with experienced advice (snip) ... (snip) That seems to be the...
Richard Amirault
ramirault@...
Jul 8, 2003 10:08 pm
5397
... One thing to remember is that during your test there were probably two sources of chromatic aberration that are more significant then that contributed by...
... Personally I would take a 5mm Lanthanum with 20mm eye relief over a 4.8mm Nagler and have money left over! The drawback is that you do lose a large amount...
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