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bierbelly
Postmaster
Reged: 01/23/04
Posts: 5434
Loc: Sterling, VA
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I've got a question about the overall necessity for barlows. My scope has an f/ratio of f/4, and was supplied with a couple of barlows. Now I know that the barlows increase the effective focal length of the scope, and thus increase the effective power of the eyepiece placed into it. However, my question is, if I have both a 10mm and a 5mm eyepiece, is there any benefit to using the 2X barlow with the 10mm eyepiece over using the 5mm eyepiece alone?
I ask because I'm at a point in life where I can pretty much afford what I want (in the way of eyepieces anyway, and the barlows I have are somewhat suspect in my mind as to their quality. Should I replace the barlows or just get eyepieces in the focal length/power ranges that I want?
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12" DSH
8" f/4 Vega MakNewt
6" MN66
TV85
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werewolf6977
Lord High Smasher
Reged: 12/15/03
Posts: 7442
Loc: Hanover, Ohio
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The main benefit of a Barlow lens is that you retain the eye relief of the ep you are putting into the Barlow. If you are stuck with eyeglasses like I am, this can be a very important factor! WW 
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Pete
6" Apogee/LXD55 - "The Beast"
Starhopper 6" Dob - "Shiva"
Spaceprobe 130 EQ - "Spacey"
Bushnell Fatboy
The Abomination
Sun Pak Pro 7500 Platinum Edition
10X25 Bushnell Camo Roofies
7X35 Tasco Classic Plastic (good views though)
7X42 Tasco Rare Bird
10X50 Nikon Actions (Type 7)
15X70 Skymasters - "DroolMeisters"
One ratty old IBM 600E LapTop
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Peter Argenziano
Watcher of the Skies
Reged: 11/11/03
Posts: 2811
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I have always preferred the performance of a native eyepiece over a Barlowed eyepiece. That being said, sometimes it is advantageous to use a Barlow in order to maintain more comfortable eye relief.
I have a TV Big Barlow and a UO 3x Klee.
By the way, with that moniker you shoud have an avatar of Homer instead of Alfred. 
Peter
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Peter
14.5" Starmaster
I hail from the explosive jetsam of a multitude of high-mass stars that died more than 5 billion years ago.
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bierbelly
Postmaster
Reged: 01/23/04
Posts: 5434
Loc: Sterling, VA
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Quote:
I have always preferred the performance of a native eyepiece over a Barlowed eyepiece. That being said, sometimes it is advantageous to use a Barlow in order to maintain more comfortable eye relief.
I have a TV Big Barlow and a UO 3x Klee.
By the way, with that moniker you shoud have an avatar of Homer instead of Alfred.
Peter
I use Homer on other boards, very intuitive of you. I'll probably switch to Homer sometime soon. I recently picked up a couple of Televue Naglers (Radians) in preparation for Mars, which have excellent eye relief, even though they're 4mm and 5mm respectively. Just wondering if I should bother replacing my barlows...doesn't seem worth it.
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12" DSH
8" f/4 Vega MakNewt
6" MN66
TV85
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