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M20 Trifid Nebula in LRGBHa

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Posts Made By: Greg Nowell

January 8, 2008 05:21 AM Forum: Equipment Talk

Feeling the heat

Posted By Greg Nowell

It is well known in high humidity and very cold areas that to prevent dew and frost you need to keep the eyepieces warm. There are a number of strategies for keeping them warm; I do not need to go into them here.

My question is: We always want to COOL a primary mirror or refractor objective to get optimal performance. But we prefer under many conditions a WARM eyepiece. Is there any reason to think that a warm eyepiece delivers a compromised image vs. a cold one? My guess is, that with the lens groups sealed and the short distances involved, it wouldn't matter, but I've never seen it discussed.

I suppose at another level it's academic. Even if there is a compromised performance, it's better to have a warm eyepiece that isn't frosted or covered with dew than one that is unusable.

regards
Greg N

January 9, 2008 10:06 PM Forum: Equipment Talk

Whoa!

Posted By Greg Nowell

I read a rather disconcernting essay today on Yahoo! Refractors, by a noted authority on eyepieces, that rather explicitly wishes owners of SCTs to be, well, dead. I find this to be perhaps the most regrettable turn in the ongoing dialogues over equipment types. I thought it fitting to put the quote on to an overlay of an outstanding image taken by an SCT. This is strictly clip and paste stuff.

regards
Greg N

January 14, 2008 08:36 PM Forum: Equipment Talk

The incredible shrinking Floyd Blue

Posted By Greg Nowell

I don't know if anyone's noticed but if you toggle between Floyd's avatar, where he has a scope that is as long as he is tall, to his Yahoo ID, and go back and forth, it's kinda weird, I mean I know it's supposed to be a different OTA and all, but if you get fixated on the tube as reference point, it looks like Floyd is growing of shrinking depending on the direction.....

...maybe something in the coffee today...

greg n

January 15, 2008 05:19 AM Forum: Politics

The coming recession

Posted By Greg Nowell

NYT article to chew over...

What the heck I'll put out a prediction. Next year this time the average used price here on the 'mart will be about 20% lower. XLT C14s in the mid to high 2s and TEC 140s in the low 4s.

We'll see if it comes to pass. I take my own predictions with multiple grains of salt, almost always the opposite happens.

Incidentally for those that HAVE jobs recession means an increase in purchasing power (remember in 1998...they starved in SE Asia while we got to go whooo hooo on 80c/gallon gasoline: but this is going to strike the domestic economy). The contraction in aggregate income is borne primarily by those with no work.

regards
Greg N




January 14, 2008

Americans Cut Back Sharply on Spendin
By MICHAEL BARBARO and LOUIS UCHITELLE

Strong evidence is emerging that consumer spending, a bulwark against recession over the last year even as energy prices surged and the housing market sputtered, has begun to slow sharply at every level of the American economy, from the working class to the wealthy.



The abrupt pullback raises the possibility that the country may be experiencing a rare decline in personal consumption, not just a slower rate of growth. Such a decline would be the first since 1991, and it would almost certainly push the entire economy into a recession in the middle of an election year.



There are mounting anecdotal signs that beginning in December Americans cut back significantly on personal consumption, which accounts for 70 percent of the economy.



A raft of consumer companies — high-end stores like Nordstrom and Tiffany, and middle-of-the-road ones like Target and J. C. Penney — reported a pronounced slowdown in growth last month, and in several cases an outright drop in business.



American Express said that starting in early December the growth in the rate of spending by its 52 million cardholders, a generally affluent group of consumers, fell 3 percentage points, from 13 percent to 10 percent, the first slowdown since the 2001 recession.



And consumer confidence, an important barometer of economic health, has plunged. Andrew Kohut, president of the Pew Research Center, says consumer satisfaction with the economy has reached a 15-year low, according to the firm’s polling.



Even wealthier consumers, who were seen as invulnerable to rising gasoline prices and falling home values, are feeling the squeeze.



“People are clearly concerned that we are headed into a recession,” said Stephen I. Sadove, the chief executive of Saks Fifth Avenue, the upscale department store whose runaway growth throughout much of the year slowed markedly in December.



Gia Trumpler, 37, a travel consultant who lives in Manhattan, shops at luxury chains like Saks. But she is trimming costs where she can by bringing lunch to work from home, rather than eating out. “Everything just feels more expensive to me now,” she said, including the cost of heating her apartment this winter.



There are plenty of recession naysayers. Average hourly wages and salaries have not fallen, and some economists argue that unless — or until — that happens, consumer spending will hold up despite widespread economic unease. According to these economists, what happened in December was a temporary blip.



“Incomes have managed to hold up,” said Chris Varvares, president of Macroeconomic Advisers, an economic forecasting firm, who added that the data to date did not support the view that a recession was inevitable.



Even in tough economic times Americans rarely reduce their consumption, preferring instead to slow the growth in their spending. Since 1980, they have cut spending in only five quarters — a total of 15 months — most of them in the depths of a recession. The 2001 recession passed without a cutback in consumer spending.



Only once before, in 1980, did consumer spending fall during a presidential election year, helping Ronald Reagan in his campaign against Jimmy Carter, the Democratic incumbent.



Official statistics do not yet show that consumer spending has dropped, but they do suggest that in late 2007, it slowed in areas like automobiles, furniture, building materials and health care, said Mark M. Zandi, chief economist at Moody’s Economy.com.



Fresh evidence of a pullback is pouring in from many quarters as Americans confront the triple threats of higher energy costs, falling home prices and a volatile stock market.



Perhaps the strongest barometer over the last 30 days is the performance of the country’s big chain stores. December turned out to be a blood bath for retailers at every rung on the economic ladder, with sales for the month growing at the slowest rate in seven years.



Sales at stores open at least a year, a crucial yardstick in retailing, plunged by 11 percent at Kohl’s and 7.9 percent at Macy’s, compared with last year.



Chains that cater to the middle and upper classes, which have benefited from years of trading up — when customers splurge on select expensive products — struggled as well. Coach, the leather goods maker, said sales of its popular handbags had become sluggish, prompting the company to issue rare coupons to drum up business.



“This is the real deal — consumers are slowing down across the spectrum,” said David Schick, a retail analyst at Stifel Nicolaus.



But it is the trouble at the highest reaches of retailing that has economists most worried about a recession. Over the last year, even as low-wage and middle-income consumers have cut back, the wealthy have spent freely, keeping high-end chains insulated from the economic turbulence.



That started to change in December, as shoppers held off on buying $300 designer shoes and $500 dresses. For example, store sales fell 4 percent at Nordstrom, the high-end department store.



And Tiffany, the upscale jeweler, said the number of purchases at its stores dropped last month. In an interview, its chief executive, Michael J. Kowalski, said that even if the wealthy remain so at least on paper, their economic anxiety is taking a toll.




“It’s a reaction to the general economic uncertainty everyone is feeling,” he said. “There are housing price declines and financial market instability. There is a lot of caution out there, and it’s reflected in jewelry sales.”



At the same time, the number of overdue payments on American Express cards is surging, the company said — and this among well-heeled cardholders who charge up to $12,000 a year, on average, on each card. American Express has called some cardholders in the last few weeks to ask if they will have trouble paying their bills.



“We are seeing a correlation with housing prices,” said Michael O’Neill, a spokesman for American Express. “The falloff in spending is everywhere in the country, but it is greatest in those areas like south Florida and California, where home prices have fallen the most.”



The big exception is gasoline. American Express and the Consumer Federation of America say that consumers are buying just as many gallons as ever, but paying more for them, and that has forced cutbacks in other purchases. Gasoline prices usually drop after the summer driving season, but this year they shot up, from $2.85 a gallon on average in September to $3.07 in December and $3.15 in the first week of January.



A similar trend is evident in the cost of natural gas, electricity and home heating oil. “We built these big houses in the suburbs, which need a lot of energy to stay warm and a car to go shopping,” said Stephen Brobeck, executive director of the Consumer Federation. “And we can’t change that quickly.”



The impact of rising gasoline prices “is just profound on middle- and lower-income families,” said Mr. Kohut of the Pew center. “Our surveys are showing one of the lowest levels of satisfaction with national conditions in any recent presidential election year. You have to go back to 1992 to get a lower number of people saying the national economy is excellent or good.”



The nation was recovering from recession that year. Consumer spending had contracted in two separate quarters in 1991, and while economic growth was gradually accelerating as Bill Clinton and George H. W. Bush sought the presidency, the Clinton camp famously posted a sign in its campaign war room proclaiming, “It’s the economy, stupid.”



There are some bright spots now in consumer spending. Sales of sports gear and electronic gadgets — particularly G.P.S. navigation devices and flat-panel television sets — have risen over the last three months. To Stephen Baker, vice president for industry analysis at the research firm NPD Group, that suggests there is still enough purchasing power for people to buy what they really want.



“We probably would not have seen strong sales for electronics products that people really want if the overriding issue was economic,” Mr. Baker said.



But not everyone is splurging. Jinal Shah, 22, a college senior in New York, said she wanted to buy the popular Nintendo Wii video game system as a gift for herself this holiday season, but had second thoughts because of the $250 price tag. She ended up not purchasing it.



“You have to make choices,” she said. “I get the Wii, or I go out more. I am just much more aware of the tradeoff now.”

January 21, 2008 06:17 PM Forum: Equipment Talk

What killed the go-to wars?

Posted By Greg Nowell

Y'all remember those endless go-to threads pro and con? Seems like it was 90% of what there was to read on SAA. So what happened?

1. We got bored and moved on.
2. SAA broke up into a zillion forums and everyone hangs out with like minded folks.
3. The high end GEM makers all have go-to now.
4. The low end GEM makers all have go-to now.
5. The fork mounts all have go-to now.
6. Dob guys, after waging bitter warfare, quietly converted on the sly to the Argo Navis + stellarCAT system when it became reliable and widely available.
7. DSCs gobbled up the residual market leaving very few people out there who aren't computerized one way or another.

Sad part about it is some of us who like push-to have very few choices on the market these days--either older used stuff or Losmandy. I guess Vixen still puts out some push-to mounts.

What else killed the eternal go-to wars?

regards
Greg N

January 21, 2008 06:22 PM Forum: Equipment Talk

Leading Portable Piers and Tripods

Posted By Greg Nowell

I have some nice stuff but I'll leave that aside. I'd like to know what people consider to be the leading options, best option if price be damned, best value for the money, most convenient to set up, most stable....whatever you want.

This is an under-discussed topic. I'm also very curious to know if ANYONE is using the Centaurus carbon fiber tripod that I saw at NEAF.

regards
greg n

January 28, 2008 12:00 AM Forum: Equipment Talk

John Mahony's intro optics web page

Posted By Greg Nowell

http://geocities.com/jmmahony/optics/optics.html

I'm posting this because it's a nice resource that has been underutilized, basically because it's kind of hard to find it via google.

regards
Greg N

February 2, 2008 06:02 PM Forum: Equipment Talk

why does Gaia have rectangular mirrors?

Posted By Greg Nowell

Read the S&T article about GAIA satellite mapping project but they didn't give any details about WHY this scope has rectangular mirrors (they did explain why it has two matched scopes with rectangular mirrors).

Anyone know the optical story here?

thanks
Greg N

March 4, 2008 04:11 AM Forum: Equipment Talk

and anutha thing...(small Newts)

Posted By Greg Nowell

I have a very nice f/10 4.25" Newt from days of yore which I have only rarely used (Optical Craftsman). My son has a 4.5" Star Blast.

Compared to my f/6.5 Vixen ED doublet (102mm), the f/10 Newt does pretty well on planets. But it is longer and more difficult to move around.

You get into all kinds of weirdnesses with these small apertures in Newts. Let's say you want:

Excellent wide field performance with a 2" eyepiece
Excellent planetary performance at magnifications up to 35x per inch

You're going to have a problem with the Newt more than the refractor. One deficiency is that you can't illuminate a wide field eyepiece very well. If you have long focal length you're also going to sacrifice field of view. If you enhance the field of view with shorter fl, you get other aberrations and compromise on the planets.

The 4.5" Star Blast armed with a Pan 24 makes a really nice wide field instrument, and I suppose that one could be fashion which is better than my son's (sustaining magnification on the planets better) but I'm not quite sure how.

Six and eight inch scopes, by the way, are no longer really small instruments from the point of view of portability. My friend's 6 dob takes up a good deal of space, as does my FS128. But the Newts tend to be bulkier for any given aperture I suppose because they try to provide one inch around the mirror cells. Maybe a truss arrangement would take care of that.

Anyhow I'm not saying one can't have high end Newts in smaller apertures. What I am saying is that in an era where high end often means things like a Pentax XW40 or a Nagler 31 as well as time viewing Saturn or Jupiter throuogh a 3.5mm eyepiece, there are a host of issues from balance to field illumination on which the refractor has an edge. So why not bite the bullet and get a good refractor? (for the high end clientele)

On the other hand, while the Star Blast does not really come close to the Vixen 102's capabilities, it is such a good deal for the money, and does so well at low powers with the Pan 24, that it is in my personal estimation preferable to a set of binoculars. Your arms don't get tired, you have over three degrees, and there is much to done with a little scope like that. So I am sensitive to the principle. But having overhauled my old optical craftsman I came to appreciate that there are limitations on small mirrors.

Well I've meandered but I think what kills the small aperture Newts is the desire for crisp wide field low X views in two inch eyepieces, combined with the desire to be able to "bump it up" and still have good performance on a planet. Newts seem to have to choose one or the other.

regards Greg N

March 11, 2008 09:57 PM Forum: Equipment Talk

Telescopes Next????

Posted By Greg Nowell

The below is the first three paragraphs from today's WSJ. The whole article is interesting but this gives the picture. cites many classic cars down from $45k to $30k. -greg n

Credit Crunch Hits
Classic Car Prices
Run-Up in Values of Hot Rods, Muscle Cars
Loses Steam as Funding Source Dries Up
By DAN CARNEY
Special to THE WALL STREET JOURNAL
March 11, 2008

The fallout from the credit crunch and housing market turmoil has reached the garages of classic car collectors. The value of some vehicles has declined by a third from two years ago.

Over the last decade, rising home values helped many Baby Boomers recapture their youth by buying American muscle cars and hot rods that were popular from the late '50s to the early '70s.

"Home equity was the ATM out of which a lot of people were withdrawing money to have fun," says McKeel Hagerty, CEO of Hagerty Insurance Agency, which specializes in classic cars. "What the credit crunch has affected is the bottom part of the market."