Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1
    yahoa's Avatar
    yahoa is offline Main Sequence
    Points: 4,788, Level: 47
    Level completed: 19%, Points required for next Level: 162
    Overall activity: 0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!5+ Referrals Achievement!200+ Posts Achievement!
    Join Date
    Jun 2011
    Location
    Lebanon
    Posts
    139
    Points
    4,788
    Level
    47
    Thanks
    48
    Thanked 27x 17 Posts

    Default I want to buy new dobsonian for the new moon



    Hello

    We are planning to buy a new dobsonian to better see the new moon at age about 15hours, and that is after the sun set or if possible before it sets (when the moon is far from the sun)

    now I have a 8inch dob orion.

    This is very important to me, it is for islamic months

    Thank you

  2. #2
    wallcreeper's Avatar
    wallcreeper is offline Main Sequence
    Points: 8,122, Level: 62
    Level completed: 91%, Points required for next Level: 28
    Overall activity: 0%
    Join Date
    Jan 2010
    Location
    NH
    Posts
    160
    Points
    8,122
    Level
    62
    Thanks
    2
    Thanked 88x 50 Posts

    Default

    Are you looking for a smaller or a bigger dob than your current 8 inch?
    Sky-Watcher 8 Inch Collapsible Dob with Astrozap Shroud
    Orion Astroview 100mm F/6 Equatorial + Alz-az Versago II
    Sterling 40mm Plossl, TV 32mm Plossl, SW 25mm SuperPlossl, 18mm & 12mm TV Radian, 9mm Agena EWA, 6mm Astro-Tech LER, TV 2X
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  3. #3
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    If it is up above the horizon and not blocked by any buildings-- and you have clear skies--- the 8 inch DOB should be able to see a thin crescent. Try NOT to view in the direction of a large city-- with any light pollution and or heavy industry.
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  4. #4
    OleCuss's Avatar
    OleCuss is offline Curmudgeon
    Points: 61,807, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 21.0%
    Achievements:
    200+ Posts Achievement!First 1000 Experience Points400+ Posts Achievement365 Days+ Registered Achievement!Got three Friends
    Join Date
    Oct 2010
    Location
    Central California, USA
    Posts
    12,088
    Points
    61,807
    Level
    100
    Thanks
    2,214
    Thanked 5,446x 3,560 Posts

    Default

    Quote Originally Posted by yahoa View Post
    Hello

    We are planning to buy a new dobsonian to better see the new moon at age about 15hours, and that is after the sun set or if possible before it sets (when the moon is far from the sun)

    now I have a 8inch dob orion.

    This is very important to me, it is for islamic months

    Thank you
    Honestly, I would think that an 8 inch Dobsonian would be quite good for that. If you need something bigger/better, then let us know how we can help you choose a more suitable instrument.

    Some things I would be interested are:

    1. What your budget will be for the instrument and associated items,
    2. Do you need a GoTo or tracking telescope? (If you are trying to detect new moon during daylight hours or in a very light-polluted area this could be quite useful).
    3. Do you need to transport the telescope?
    4. Do you have any physical limitations which could make it difficult to use or transport a telescope?
    5. Are there restrictions on where or what you can purchase? Can you only purchase from certain vendor(s) within Lebanon or can you import from the U.S., Europe, or Asia, etc.?
    6. How big an instrument do you perceive a need for? Since I would think that an 8 inch would be quite good for this purpose, I'm particularly interested in this question.
    7. Is it of importance to be the first to be able to detect the new moon? If so, I can understand why you might want a bigger instrument and the big question will be just how much you can afford - it was once possible to purchase a 50 inch Dobsonian from Orion, it just cost a lot of money. . .

    We'll probably get additional questions as things go on.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    XX12G and XT8; 10 inch LX200GPS;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8SE; Tele Vue NP-101is (Petzval apochromat); Meade LS-8; WO GT-71; AVX and Losmandy G-11 mounts.

  5. #5
    yahoa's Avatar
    yahoa is offline Main Sequence
    Points: 4,788, Level: 47
    Level completed: 19%, Points required for next Level: 162
    Overall activity: 0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!5+ Referrals Achievement!200+ Posts Achievement!
    Join Date
    Jun 2011
    Location
    Lebanon
    Posts
    139
    Points
    4,788
    Level
    47
    Thanks
    48
    Thanked 27x 17 Posts

    Default

    Hello

    First thank you for your kind replies and rich support,

    Second, here are all the details and what we are planning to do:

    1- We have a 8inch Orion dobsonian with goto, it is very good, and we place it near the beach just 500m away from the beach and about 30m high form sea level, but this place where we placed the telescope is located in a city (which I understand now that it is not good at all for sighting the moon, especially that I see that there is a lot of light pollution when the nigh comes).

    2-we plan to purchase another telescope which will be better, to place it on a mountain about 1600 or 2500 meters high (very easy to reach), to be 100% sure that we are at higher place than others to try seeing it to either be sure we can see it or we can't see it at all by any or by all instruments including seeing it by the naked eye.

    3-a good ccd camera to be sure that the telescope is pointing to it.

    4-good align method to be most precise,

    5-maybe some filters to have a maximum contrast for the moon.

    6-it could be a relector, refractor, ..dobsonian..altazimuth..equatorial mount... or any other just the best



    Quote Originally Posted by OleCuss View Post
    Honestly, I would think that an 8 inch Dobsonian would be quite good for that. If you need something bigger/better, then let us know how we can help you choose a more suitable instrument.

    Some things I would be interested are:

    1. What your budget will be for the instrument and associated items,
    2. Do you need a GoTo or tracking telescope? (If you are trying to detect new moon during daylight hours or in a very light-polluted area this could be quite useful).
    3. Do you need to transport the telescope?
    4. Do you have any physical limitations which could make it difficult to use or transport a telescope?
    5. Are there restrictions on where or what you can purchase? Can you only purchase from certain vendor(s) within Lebanon or can you import from the U.S., Europe, or Asia, etc.?
    6. How big an instrument do you perceive a need for? Since I would think that an 8 inch would be quite good for this purpose, I'm particularly interested in this question.
    7. Is it of importance to be the first to be able to detect the new moon? If so, I can understand why you might want a bigger instrument and the big question will be just how much you can afford - it was once possible to purchase a 50 inch Dobsonian from Orion, it just cost a lot of money. . .

    We'll probably get additional questions as things go on.


    1-budget is not defined at all, we are first trying to know what is the best to us to easly and fastly detect the new moon far from the sun, and to be sure 1000% if it can be viewed by eye or not, by binoviewers or not, by telescope or not, and even by a ccd camera or not, the ccd camera sould help us at least to be sure that we are looking at the moon and not in the sky far from moon.

    2-the goto is a must with its the best align possible

    3-yes we always need to transport the telescope to fix it two days before the new moon in a safe place directly under the sky but we leave it in that place for the two next days with a parcking position and we cover it and protect from rain wind... when leaving in the night.

    4-no transport limitations

    5-we may bring it from any place in the world via DHL or UPS shipped directly here with no problem

    6-for the question:<How big an instrument do you perceive a need for?>, really I don't know, as I heard that the big aperature is better and will gather more light which is a lot better to see the moon.and this is why I am posting, it is really to reach this many information about that.

    7-it is not to be the first, but to see it as soon as possible, and as I said to be sure that I can always see it as fast as possible with evidence, and this is the real need.

    Thank you very much

  6. #6
    yahoa's Avatar
    yahoa is offline Main Sequence
    Points: 4,788, Level: 47
    Level completed: 19%, Points required for next Level: 162
    Overall activity: 0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!5+ Referrals Achievement!200+ Posts Achievement!
    Join Date
    Jun 2011
    Location
    Lebanon
    Posts
    139
    Points
    4,788
    Level
    47
    Thanks
    48
    Thanked 27x 17 Posts

    Default

    Hello

    Just for note, i understood that 14inch refractor is too expansive so about 200 000 euros and it is 5m long, is that true?

    if so, it will not be an option for us.

    Thank you

    Best Regards

    Yahoa

  7. #7
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    Again the 8 inch DOB on top of a mountain will show the moon.

    8 inches is enough aperture especially under semi-dark skies.
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  8. #8
    Voyager3's Avatar
    Voyager3 is offline HYPER GIANT
    Points: 14,604, Level: 83
    Level completed: 30%, Points required for next Level: 246
    Overall activity: 0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points50 Posts Achievement!
    Join Date
    Jul 2011
    Location
    Montreal
    Posts
    2,211
    Points
    14,604
    Level
    83
    Thanks
    1,226
    Thanked 849x 646 Posts

    Default

    Honestly, I don't know how you're going to manage spotting a 15hr old Moon.

    By definition a new Moon is always very close to the Sun.

    You should really wait at least 24 hrs to observe it, giving it time to seperate a bit from the Sun, unless you want to risk burning a hole through your eye (and incidentally destroying your equipment).
    (A solar filter won't help, as it will make the Moon invisible).

    As for a 14" refractor...
    I don't know why anyone would want to go to all that trouble, but I found one for you:

    APM Apochromatic refractor AP 356/4270 CNC II OTA

    You'll have to wait 18 to 24 months for delivery and pay 295,000 Euros
    (about $420,000).
    That thing must weigh a couple of tonnes...

  9. #9
    yahoa's Avatar
    yahoa is offline Main Sequence
    Points: 4,788, Level: 47
    Level completed: 19%, Points required for next Level: 162
    Overall activity: 0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!Got three Friends20+ Friends Achievement!5+ Referrals Achievement!200+ Posts Achievement!
    Join Date
    Jun 2011
    Location
    Lebanon
    Posts
    139
    Points
    4,788
    Level
    47
    Thanks
    48
    Thanked 27x 17 Posts

    Default

    Quote Originally Posted by Joe Lalumia View Post
    Again the 8 inch DOB on top of a mountain will show the moon.

    8 inches is enough aperture especially under semi-dark skies.
    Thanks

    yes I understood that, but we need two, one on the mountain , just for some persons who will be there to sight and confirm either seeing it or not, and one on the ground near the beach were very important persons will meet and take the decision if they saw it just after the sun set, so the next day it will be the first day of the month.

    So the second one we want to buy, we want it better than that, we cannot buy just the same, this is why I am asking.

    And after a year we may buy 3 more, it is decision for over 2 million of people, this is why it has big importance.



    Honestly, I don't know how you're going to manage spotting a 15hr old Moon.

    By definition a new Moon is always very close to the Sun.

    You should really wait at least 24 hrs to observe it, giving it time to seperate a bit from the Sun, unless you want to risk burning a hole through your eye (and incidentally destroying your equipment).
    (A solar filter won't help, as it will make the Moon invisible).
    As i said before, there is no way to wait until next day, in such case no need for a telescope

    I told you far from the sun, please read my post very well my dear.

    Please see the Islamic Crescents' Observation Project (ICOP) for what I am talking for.


    As for a 14" refractor...
    I don't know why anyone would want to go to all that trouble, but I found one for you:

    APM Apochromatic refractor AP 356/4270 CNC II OTA

    You'll have to wait 18 to 24 months for delivery and pay 295,000 Euros
    (about $420,000).
    That thing must weigh a couple of tonnes...
    OMG, this what I told yo i don't want to go far away for the moment, that is for some universities or very proffessional intitutes who will use what you gave me, not suitable for us for this, and NO GOTO!!.

    And reflector nowadays is better than refractor, who uses a refractor these days? i don't think it has any usage anymore as a proffessional told me today.

    Thank you anyway

  10. #10
    Voyager3's Avatar
    Voyager3 is offline HYPER GIANT
    Points: 14,604, Level: 83
    Level completed: 30%, Points required for next Level: 246
    Overall activity: 0%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points50 Posts Achievement!
    Join Date
    Jul 2011
    Location
    Montreal
    Posts
    2,211
    Points
    14,604
    Level
    83
    Thanks
    1,226
    Thanked 849x 646 Posts

    Default

    Quote Originally Posted by yahoa View Post
    As i said before, there is no way to wait until next day, in such case no need for a telescope

    I told you far from the sun, please read my post very well my dear.

    Please see the Islamic Crescents' Observation Project (ICOP) for what I am talking for.
    Well, you can hope to see a 15 hour new Moon "far from the Sun" all you want, it's not going to happen, "my dear". There's a little something called "planetary motion". It's a part of astronomical science and you just can't get away from it, no matter how badly the "important people" you work for want it.

    This post has nothing to do with astronomy, so I will refrain from commenting any further.
    Last edited by Voyager3; 08-05-2011 at 10:59 PM.

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Truss Dobsonian vs. Tube Dobsonian
    By jafemu in forum Dobsonian Telescopes Forum
    Replies: 11
    Last Post: 09-30-2012, 02:50 PM
  2. what is the difference of Dobsonian Telescope and Dobsonian Intelliscope?
    By Joey Calingo in forum Dobsonian Telescopes Forum
    Replies: 24
    Last Post: 07-19-2011, 01:34 AM
  3. Moon in 720p through 12" Dobsonian
    By fogboundturtle in forum Astronomy Digital Cameras Forum
    Replies: 2
    Last Post: 07-26-2010, 11:52 PM
  4. What to Get for My Dobsonian
    By jeffinputnam in forum Amateur Astronomy Forum
    Replies: 13
    Last Post: 08-28-2008, 03:01 PM
  5. dobsonian on a GEM?
    By Mark De Smet in forum Amateur Astronomy Forum
    Replies: 33
    Last Post: 12-27-2003, 11:57 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 04:45 PM.