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1st attempt at Deep-sky drawing
Mike Wirths
Hi all!
Just got in from trying out the black drawing paper I got at Wallacks art supply store a few days ago. I also got a few different types of white pencils, they all seem to be soft I may need to get a harder one, but M51 turned out pretty well I think, it took about an hour at the ep. I uploaded the scanned image to a new folder in the files area... let me know what you think. Roland you may want to get some of this paper, its thick enough to take some dew but it has a slight texture to it, which may make for less than ideal scanning, it also costs 50 cents a sheet (I think its 8x10 or so). night all! Mike |
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New file uploaded to OAFs
Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the OAFs group. File : /Astro SKETCHES/M51small.jpg Uploaded by : mwirths@... Description : You can access this file at the URL To learn more about file sharing for your group, please visit Regards, mwirths@... |
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Re: Telrad Pulser
Bruce McGlashan
Are you talking about buying the pulser unit from Perceptor or Efston? If
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the former, do you know if this is the same unit that Al Seaman described, that is available from Efston? If it is, I'd really appreciate it if you'd pick up one for me too. E-mail me offline and we'll make arrangements to get the money to you. Bruce McGlashan -----Original Message-----
From: Richard Harding <rharding@...> To: mcglashanb2@... <mcglashanb2@...> Cc: OAFs@... <OAFs@...> Date: April 25, 2001 21:58 Subject: Re: [OAFs] Re: Telrad Pulser I will be in Toronto all next week, and will pick up a Pulsar unit formyself. If anyone else wants one, I could oblige...let me know. Hey, if there were a few, I could probably negotiate a deal!! :o)
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Hurray!
Bruce McGlashan
FINALLY! My dewshield has arrived, one month less a day from when I paid
for it. So no more hokey toilet paper carton dewshields for me! While I was at it, I treated myself to a Kendrick solar filter too, since that big sunspot from a few weeks ago (NOAA sunspot region 9433) has made another appearance. It is visible naked-eye again, although somewhat less prominent than the last time. Since we had a clear late afternoon, I set up in the driveway and feasted on the first telescopic view I'd had of sunspots in just under three decades! Sure took me back! I even made a couple of sketches, although my detailed sketch of 9433 was cut off by haze. My 32mm Erfle gives a really nice, crisp full-disk image. The 10mm Lanthanum was a little soft for my liking. My wife Janet had a couple of looks too. I don't think she was impressed, unfortunately. She took a look, and then started raking the lawn. When I started sketching, she told me "Since I'm working and you're PLAYING {my emphasis}, you can make dinner". So unfortunately, there was no observing for me at FLO tonight. Too bad, looks like a wonderful evening. Bruce McGlashan |
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Re: Telrad Pulser
Bruce McGlashan
Thanks for doing the research, Janice. I might just pick one of these up
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myself. After reading Al Seaman's comments the other day, I got to thinking, and I think he's right - a push-button on the telrad might be awkward to use. Already, I tend to haul my scope around by the diagonal. If I had to hold onto a button on the telrad, I bet I'd end up moving the scope that way too, and sooner or later that hokey tape mount would let go. Since this add-on can be turned off, it seems like the right way to fix this problem we have. Too bad I didn't know about this last week - I could have picked up one of these (or more) when I was in Toronto on the weekend. Bruce McGlashan -----Original Message-----
From: jtokar@... <jtokar@...> To: OAFs@... <OAFs@...> Date: April 25, 2001 20:48 Subject: [OAFs] Re: Telrad Pulser FYI: |
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Re: Telrad Pulser
FYI:
I received two replies from EfstonScience () to my inquiry about the flashing pulser unit that can be configured to a telrad. One was from "Bruce" and the other was from "Mike" - both of them were familiar with the unit and said further inquiries could be directed to them. It is called a Telrad Pulser and sells for $29.95 (part # 830N004) in stock. Clear skies 'n Flashing bull's-eyes! Janice |
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Re: 2 very unique observations!
--- In OAFs@y..., "Mike Wirths" <mwirths@s...> wrote:
I could make out a blob a few (maybe 5) arcseconds in diameter to the The (M87) jet is very close in to the nucleus is about a fewThese are two really fine and exciting observations to make. Did you see the vidcam image some guy took of the ISS with only a 90mm scope, in the latest issue of Sky & Tel? This makes me want to try to see if I could see it too, in an 8" scope. The jet in M87 is quite a fun observation to have made: Congrats! You're really getting in some fine observing seesions, and I'm especially glad you posted the details as I find it fascinating. Observing in b.y. tonite. Photons A'Plenty Rol |
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Re: telrads. was :Re: Re: FLO Observing Report - April 22
Al Seaman
jtokar@... wrote:
Any time our paths cross and I have my telescope with me, the Telrad is available for a test drive. I like this version because it switches so easily between flashing and normal operation. And at a time when you are trying to find something faint and get the telescope locked on it, you generally are short of hands, so using one to push a button to turn off the Telrad ties up valuable appendages. The auto flash sounds more convenient than the manual push button. Cheers - Al |
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telrads. was :Re: Re: FLO Observing Report - April 22
--- In OAFs@y..., Al Seaman <alseaman@a...> wrote:
There is a new three position toggle switch on the side of theWell, looks like I'm not the first person on the planet to think that intermittent lighting on a telrad would be a welcome design feature! Thanks Al, Attilla & Bruce for all the info on various options. I have a message in to Efstonscience to see if they still carry the type of unit you bought at Starfest, Al. I'll post if I get any information re availability and prices. However, I'm also drawn by the simplicity of the "interruptor switch" design that Bruce is thinking of using for his telrad (kind of like the manual switching on & off I do now, I guess, except it would automatically return to the selected brightness). Maybe if we're all out at FLO one day soon, I'll ask for permission to take the various flashing telrads for a spin before making a decision! Thanks again, Janice |
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Re: telrads. was :Re: Re: FLO Observing Report - April 22
Al Seaman
Attilla Danko wrote:
Interesting coincidence. At Starfest last August I bought a little pulser unit to be added to a Telrad, but never quite got around to installing it (it's like the leaky roof - you never fix it when the sun is shining, but when you need it, it's too late already). Anyway, the other night at FLO (Bruce was there) I was again reminded how nice it would be to have a flashing Telrad when the aiming objects are faint. So this time I resolved to fix it. This weekend I put some other projects on the backburner and installed it. Actually quite easy to do (just follow the instructions). And it does work. There is a new three position toggle switch on the side of the Telrad - centre - off, forward - flashing (rate can be set with control on the unit), and rear - normal nonflashing operation. Haven't put it to a star test yet, but it seems to me it should be a great improvement. There is no indication on the unit as to who makes it, but looking back at my credit card slips from Starfest, I bought it from Eftonscience at a price of $29.00 plus taxes. Checked their web site to-day - no listing of this item on it. An enquiry to the store will probably work. Hope this is helpful. Cheers - Al Seaman |
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Re: question
Hi Robert!
Glad I understood you. No need for any further apologies regarding your writing -- we do understand and that's all that matters, isn't it? Note that a sky in the city, say 5.5 mag overhead, shows substantially less than the data I gave you for nearly perfect skies. In the city, you see 1.5 to 2.0 magnitudes less than what I wrote both for galaxies and for stars. Also, any moon or haze at all, and you see even less again. I guess you must already know all that, so I include it here only in case beginners are reading this eMail group, Robert. Best of luck on your choices... Later Roland |
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Re: question
Darkbeing
yep that ansers the question well thank you i know I ma not to good a puting
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my thought's to words but you seemed to understand me {smile} i try to explane beter next time thanks again the reasion i asked it is cuse i want to buy a dob 8 or 10 inch and i think 8 would do me just fine from the numbers i have to take into conciteration that i have to be able to move the scope and put it all togeather wile being in a wheel chair anyway thanks again ~~{ Robert H Young }~~ -----Original Message-----
From: r.prevost@... [mailto:r.prevost@...] Sent: Monday, April 23, 2001 11:18 PM To: OAFs@... Subject: [OAFs] Re: question --- In OAFs@y..., "Darkbeing" <darkbeing@a...> wrote: What does the math say about a 4.5 in objective lens f7.9 scope seeHello Robert! I'm not sure if I understand your question, but here is a stab at it: I had a 4.5 inch f/8 scope for one year and here is the besst I could see in it from a dark site. For 4.5" scope:(observed) Faintest star = approx. magnitude 13 Faintest galaxy = approx. magnitude 11.5 (averted vision) For an 8" scope:( My SCT-8" observed) f/10 Faintest star = approx. magnitude 14.9 ( in 6.8 skies ) Faintest galaxy = approx. magnitude 13.1 (averted vision) For an 10" scope (theory only): Faintest star = approx. magnitude 15.3 ( in 6.8 skies ) Faintest galaxy = approx. magnitude 13.5 (averted vision) Note that the above numbers are for a medium experienced observer who can use averted vision. I hope I understood your question properly and that this can be helpful. Later, Roland Your use of Yahoo! Groups is subject to |
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Re: question
--- In OAFs@y..., "Darkbeing" <darkbeing@a...> wrote:
What does the math say about a 4.5 in objective lens f7.9 scope seeHello Robert! I'm not sure if I understand your question, but here is a stab at it: I had a 4.5 inch f/8 scope for one year and here is the besst I could see in it from a dark site. For 4.5" scope:(observed) Faintest star = approx. magnitude 13 Faintest galaxy = approx. magnitude 11.5 (averted vision) For an 8" scope:( My SCT-8" observed) f/10 Faintest star = approx. magnitude 14.9 ( in 6.8 skies ) Faintest galaxy = approx. magnitude 13.1 (averted vision) For an 10" scope (theory only): Faintest star = approx. magnitude 15.3 ( in 6.8 skies ) Faintest galaxy = approx. magnitude 13.5 (averted vision) Note that the above numbers are for a medium experienced observer who can use averted vision. I hope I understood your question properly and that this can be helpful. Later, Roland |
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question
Darkbeing
what does the math say about a 4.5 in objective lens f7.9 scope see for
magatude I am not good at math anyone know the numbers of this ?? as how much it should see I know things will be very small but how much will it be able to see as in the highest mag for a galaxy sorry for the question but I repeat I am not very good at math and am just wondering I ma just trying to get the info so I can figure out which scope I will save for I thinking of buying a 8 or 10 inch dob and building a small building out back that the roof will be removable for it to be permitly mounted I know what I have seen in it but was wondering under perfect sky what they say it should see this way give my self some insight as to the difference a 8 or 10 inch dob will be instead of it anyway just a question if anyone good at math ~~{ Robert H Young }~~ |
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Re: telrads. was :Re: Re: FLO Observing Report - April 22
Bruce McGlashan
Thanks, Attilla and Janice.
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I just did some web surfing, and found a site that shows you how to build the blinking circuit. If anyone wants the reference, just e-mail me. I came across a mail archive where someone was cursing such a circuit, because whenever he used a buddy's scope with a blinking telrad, he couldn't figure out whether the telrad was off, his eye wasn't aligned (a problem I have) or the blinker was in the 'off' part of its cycle. He went for a simple normally-on pushbutton 'interruptor' switch instead. That appeals to me, if only for the simplicity - one hole drilled, one wire snipped and two solder joints. Even I can do that. Also, I have tried to find a web presence for Perceptor before - I gather they don't have one. What a bummer - they just lost a sale. Bruce McGlashan -----Original Message-----
From: Attilla Danko <attilla.danko@...> To: OAFs@... <OAFs@...> Date: April 23, 2001 20:03 Subject: telrads. was :Re: [OAFs] Re: FLO Observing Report - April 22 There is an ontario amateur, whoose nameI had my telrad retrofitted by him at a Huronia Starparty. I suspect he is aregular at starfest. |
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telrads. was :Re: Re: FLO Observing Report - April 22
Attilla Danko
There is an ontario amateur, whoose name
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escapes me, who has built a blinking circuit for teltrads (variable speed). I had my telrad retrofitted by him at a Huronia Starparty. I suspect he is a regular at starfest. I'm fairly sure that Perceptor sells his telrad blink circuit. -ad ----- Original Message -----
From: <jtokar@...> To: <OAFs@...> Sent: Monday, April 23, 2001 7:55 PM Subject: [OAFs] Re: FLO Observing Report - April 22 --- In OAFs@y..., "Bruce McGlashan" <mcglashanb2@h...> wrote:One other thing - I had quite a bit of trouble aiming at gamma andBruce - |
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