David Giles Opticsmart.com - Home of Apertura Dobsonian Telescopes, and other cool stuff...
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A-P 130GT 8" EDGE HD AVX AP Wood Tripod
Quote:David,When I put an 8" w/Tweakers Dream Package in the shopping cart I get this message beneath the product name:* This product is not available in the requested quantity. 1 of the items will be backordered.Is this accurate? thanks, -Tim
Quote:Quote:David,When I put an 8" w/Tweakers Dream Package in the shopping cart I get this message beneath the product name:* This product is not available in the requested quantity. 1 of the items will be backordered.Is this accurate? thanks, -Tim No that definitely wasn't accurate and I've fixed the problem (inventory) in our system now. Thanks for the head's up Tim!!David GilesOpticsmart.com
Quote:Very good, thanks! I'll try to call today, have a couple questions for you. -Tim
Quote:I expect someone will ask about vignetting with the light shield, so I’ll just address that now. Yes it is of course possible that some minor vignetting will occur when using the widest angle eyepieces (as is true with competing light shields on the market).
But as is often mentioned here on the forum, the eye is quite insensitive to vignetting, so it shouldn’t be an issue. If a customer DOES notice vignetting on a wide angle eyepiece, they can simply remove the shield during use of that eyepiece if they wish. Or they may choose to leave the shield in place if they decide that its light-blocking duty outweighs any minor vignetting.
10" F/4.7 Modified Skywatcher Reflector, 38mm Orion Q70, 17mm Modified Ultima LX, 10mm TeleVue Delos, 7mm Pentax XL.
Quote:Hi David,I have an extension I use on the end of my 10" reflector,(which is there as a dew shield / stray light blocker), which extends 15" longer, (1.5x the aperture of my mirror which is the golden rule I think), and I use a 2" 38mm Orion Q70 and I don't get any vignetting at all, so that extension you have on there should be fine!BTW, your scopes look excellent with all of the right "tweaks" on them! I know I would buy one for sure if I needed one. Cheers,
Orion XT10g Meade LXD55 AR6 SE6 OTA
Quote:I wonder if the light shield material could be made to wrap around the entire tube to form a dew shield?
Tom Karpf (tkarpf) Vice President, Astronomical Society of Greater Hartford www.asgh.org
Quote:Little sky = low potential for dew.
Quote:Quote:I wonder if the light shield material could be made to wrap around the entire tube to form a dew shield? It would certainly be possible, although we don't have any plans at this time to offer full-wrap dew shields.David GilesOpticsmart.com
Quote:You don't need a dew shield with a dobsonian; the tube acts as a dew shield.
Quote:The Astro Zap flexible dew shields can be used. I ordered one for a newt through Scopestuff. Just sent him the tube diameter and Astro Zap cut one to fit it.
Quote:Minor note: with TRUSS reflectors, you DO want a shroud which will help quiet a bit with dew.
Quote:I'm actually thinking about dew on the secondary. I think you guys are referring to dew on the primary when you say that dobs are not likely to have dew problems (although I've seen primaries with dew on them a couple of times).I have seen dew on truss dob secondary mirrors plenty of times, even with a shroud. That's why people make or purchase secondary dew heaters. Solid tube is a different story, as explained above. But a lot of solid tube dobs have the secondary up pretty close to the end of the tube, like the Aperturas and Zhummels, for example. Although I have not had dew on my Z8 secondary yet. My buddy built a dew shield for his 16" Lightbridge because he was having this problem.
Quote:Anyhow, the Apertura with the Tweeker's Package looks like an awesome deal to me.
“I am the only person to ever ace a 1951 USAF resolution test. My 'to observe' list says 'done'. I do not use charts or atlases when I starhop; men do not use maps. One of my sketches won an SBIG deep sky imaging contest. I am the life of star parties I have never attended. I never say anything looks like a faint fuzzy - not even a faint fuzzy. Pilots aim green laser pointers at me. Don Pensack proofreads my CN forum posts.” - The Most Interesting Astronomer in the Universe