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Your cart is empty. Taiwan GSO 0.5X Reducer 2" Diameter
Taiwan GS company is a very famous OEM manufacturer that continues to supply the highest quality parts to the world's top brand telescope manufacturer.
Made in Taiwan with very good quality Hooley multi-coated lenses
The construction is also CNC machined aluminum body for a luxurious look.
This product is a reliable product with a very high reputation.
[Magnification] 0.5x
Lens: 2 Element Airspaced
Sleeve Diameter: 2 inches (50.8 mm)
[Coating] Fully Multi-Coated
Height: Approx. 0.6 inches (16 mm) (excluding screws)
Weight: Approx. 2.5 oz (70 g) Madein Taiwan
The above data is the manufacturer's catalog value
RR
2025-09-02 10:38:23
With 2" eyepieces (visual use) you will get, if screwed right onto the eyepiece threads, about twice the original EP focal length; i. e., a 20 mm eyepiece becomes, effective, a 40 mm. BUT...The device WILL vignette, so you end up with a sort of 'black ring' around the bright central field, with a fuzzy edge. So you will NOT obtain the original eyepiece apparent field; various ones I've tried seem to reduce the AFOV by nearly fifty percent.In my use, it's to get a large (richest-field) exit pupil in f/10 scopes, which otherwise would require an eyepiece of 60 mm FL, no longer made by anybody! So a 30 mm eyepiece becomes effectively a 60 mm FL EP, but with greatly reduced AFOV.I find this great for trying to view the small (less than 5' long) Horsehead Nebula; because there is a very bright star nearby (Alnitak) the reduced field allows one to get it OUT of the visible area, which otherwise robs contrast and can sometimes make it nearly impossible to see the faint dark nebula with bright piercing light NEXT to it. You can avoid this by using higher power, but then you may lose contrast that enables the faint darkish cloud to stand out against the SLIGHTLY brighter overall background. I can even see a TINY TRACE of the Horsehead this way, without an H-beta filter. (But, I've had more than 40 years experience with the HH nebula B33, in over 100+ view, so beginners may not get the same results!)An important caveat to acknowledge is that this reducer, used visually with an eyepiece, *might* increase, or add, aberrations--especially with already long FL oculars. Ironically, this GSO-made product worked worst for me, with a 5-element (apparently Erfle type) GSO 42-mm "Superview" 2-inch eyepiece. Only my SCT's could reach focus with the reducer; even so, clarity and the precision of 'tight' star images suffered significantly; and eye relief and finding the 'sweet spot' for best viewing, were impaired. We found that it worked much, much better with 2" wide-fields made by Explore Scientific and Omegon, not specifically classical Erfle designs. In addition, the extra length added (especially if one uses a screw-on filter in addition) makes the eyepiece extend outward from the focuser until it seems precarious and unstable, demanding extreme care in moving the scope while seeking the correct field, and really 'cranking down' the attachment screws. When it works as-advertised, yielding an effectively wider exit pupil for lower power, it's quite satisfactory, IF the user is extremely careful. At the price, I fear that many customers might find this product to have a limited, VERY CONTEXT-SPECIFIC, utility. (Perhaps this is not so in a photographic application, but we are only visual observers and haven't tried it in that manner.)
SP
2025-08-16 11:48:33
値段ã¯å€¤æ®µã§ã™ã®ã§ã€ï¼•å€ä»¥ä¸Šã®å€¤æ®µã‚‚ã™ã‚‹ç´”æ£ãƒ¬ãƒ‡ãƒ¥ãƒ¼ã‚µãƒ¼ã¨ã®æ€§èƒ½ã®æ¯”較ã¯ã—ãªã„。一部ã®æ–¹ã§ã¯ã€ç¸®å°ã§ããªã„ã‚„ã€ãƒ”ントã§ããªã„評価ãŒã‚ã‚Šã¾ã™ãŒã€ã“ã‚Œã¯æらã使ã„æ–¹ã®å•é¡Œã‹ã‚‚ã—ã‚Œã¾ã›ã‚“。縮å°å€çŽ‡ã‚„ピントã§ãã‚‹ã‹ã©ã†ã‹ã¯ãƒãƒƒã‚¯ãƒ•ã‚©ãƒ¼ã‚«ã‚¹è·é›¢ã¨é–¢é€£ã—ã¦ã„ã¦ã€ä¸Šæ‰‹ã調整ã—ãªã„ã¨ã€ãƒ”ントもã§ããªããªã‚Šã¾ã™ã€‚自分ã®ãƒ†ã‚¹ãƒˆã§ã¯ã€sky-watcherã®72EDã§ï¼ˆç„¦ç‚¹è·é›¢420mm)ã€ãƒãƒƒã‚¯ãƒ•ã‚©ãƒ¼ã‚«ã‚¹ç´„60mmã®å ´åˆã€ç¸®å°çŽ‡ã¯ç´„✕0.4ã‹ãªï¼ˆã§ãŸã‚‰ã‚ãªè¨ˆç®—）。ãƒãƒƒã‚¯ãƒ•ã‚©ãƒ¼ã‚«ã‚¹ç´„35mmã§ã¯ã€ç¸®å°çŽ‡ã¯ç´„✕0.7ã§ã™ï¼ˆã“れもã§ãŸã‚‰ã‚ãªè¨ˆç®—ã§ã™ï¼‰ã€‚ãƒãƒƒã‚¯ãƒ•ã‚©ãƒ¼ã‚«ã‚¹ã‚’調整ã™ã‚‹ã¨ã€ä¸»é¡ã¨ãƒ¬ãƒ‡ãƒ¥ãƒ¼ã‚µãƒ¼ã¨ã®è·é›¢ï½„も変ã‚ã‚Šã¾ã™ã€‚å ´åˆã«ã‚ˆã£ã¦ã¯ã€ãƒ”ントã§ããªããªã‚Šã¾ã™ï¼ˆæœ›é é¡ã®ãƒ”ント調整範囲外ã«ãªã‚Šã¾ã™ï¼‰ã€‚ｄãŒé•·ããªã‚‹å ´åˆã§ã¯ã€ã¾ã 延長ãƒãƒ¥ãƒ¼ãƒ–使ãˆã¾ã™ãŒï¼ˆè‡ªåˆ†ã¯å»¶é•·ãƒãƒ¥ãƒ¼ãƒ–ã§èª¿æ•´ã—ãŸï¼‰ã€dãŒæœ›é é¡ãƒ•ã‚©ãƒ¼ã‚«ã‚µãƒ¼ã®èª¿æ•´ã§ãる最çŸè·é›¢ã‚ˆã‚Šã‚‚çŸã„å ´åˆã§ã¯ã€ã©ã†ã—ょã†ã‚‚ãªã„ã§ã™ã€‚
Canberk
2025-07-08 13:02:08
Does its job and solid build quality. I recomment buying the 2" one as there will be more comma effect with the 1.25" one.
ã¯ã³ã³
2025-05-12 16:57:32
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星空ã•ã‚“ã½
2025-03-29 10:57:00
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デジカメ
2025-02-02 15:24:40
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