140 for whole set should be plastic make lens. if not have to look at their OMNI barlow 149 or Ultima Barlow 249 w/out gst.Gary wrote:Research more into the specifications of the $140 barlow (e.g is it using better multi-coated ED lens? body mainly plastic?...etc) vs the barlow in the whole set. Else you will not be able to objectively conclude whether which is a good or better buy. Best, look through a few of them during sidewalks and see if your eyes can see a difference.bern wrote:cos if just buy a 2x barlow will cost me at least 140 and this whole set at just 140 with gst. so think kind of good buy lor.
greeting from 2nd days newbie.
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Re: greeting from 2nd days newbie.
Re: greeting from 2nd days newbie.
If the weather is clear tonight, there is good chance we will have a sidewalk session tonight. Come join us if you are free. I will bring my 2x barlow and Clifford's 5x telexender along.
Last edited by Gary on Wed May 30, 2012 2:20 pm, edited 1 time in total.
http://www.astro.sg
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
Re: greeting from 2nd days newbie.
A barlow can be a very useful accessory throughout your astronomy "career". So investing in one good one for life may be a good idea.bern wrote:140 for whole set should be plastic make lens. if not have to look at their OMNI barlow 149 or Ultima Barlow 249 w/out gst.Gary wrote:Research more into the specifications of the $140 barlow (e.g is it using better multi-coated ED lens? body mainly plastic?...etc) vs the barlow in the whole set. Else you will not be able to objectively conclude whether which is a good or better buy. Best, look through a few of them during sidewalks and see if your eyes can see a difference.bern wrote:cos if just buy a 2x barlow will cost me at least 140 and this whole set at just 140 with gst. so think kind of good buy lor.
http://www.astro.sg
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
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Re: greeting from 2nd days newbie.
what time you guys meet up and at where? if can will try to make it there.Gary wrote:If the weather is clear tonight, there is good chance we will have a sidewalk session tonight. Come join us if you are free. I will bring my 2x barlow and Clifford's 5x telexender along.
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Re: greeting from 2nd days newbie.
Hi bern,
Pm you the info already.
Pm you the info already.
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Re: greeting from 2nd days newbie.
good one too ex lei might not get approver from oc....when i bring the telescope home kanak telescope till moon liao.
Re: greeting from 2nd days newbie.
Bring your OC along tonight. For all you know she may be stunned by how Saturn looked and raise your astro budget.bern wrote:good one too ex lei might not get approver from oc....when i bring the telescope home kanak telescope till moon liao.
http://www.astro.sg
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
email: gary[at]astro.sg
twitter: @astrosg
"The importance of a telescope is not how big it is, how well made it is.
It is how many people, less fortunate than you, got to look through it."
-- John Dobson.
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- Joined: Sun May 27, 2012 10:46 pm
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- Location: Bukit Merah
Re: greeting from 2nd days newbie.
hahahah..........hope she want to. anyway can't make it tonite having dinner with family members.Gary wrote:Bring your OC along tonight. For all you know she may be stunned by how Saturn looked and raise your astro budget.bern wrote:good one too ex lei might not get approver from oc....when i bring the telescope home kanak telescope till moon liao.
will try to make it with oc the next round.
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Re: greeting from 2nd days newbie.
One small note about increasing your magnification: Your telescope is a 114mm diameter, 1000mm focal length 'scope, which means that a 5mm eyepiece, producing 200x gives an exit pupil of 0.57mm, which is close to the smallest recommended exit pupil. Adding a Barlow will result in an exit pupil of 0.28mm, which is really tiny. At this magnification you might find floaters within your eye severely interferring with your image.
Exit pupil is the diameter of the image produced at the eyepiece. This is determined by the telescope's aperture, divided by the magnification (i.e. 114/200 = 0.57mm). Generally the advice is to keep the exit pupil between 7mm and 0.5mm (any larger and light is lost outside your pupils, since young pupils maximally dilate to 7mm, smaller and floaters become very prominent). Most of my observing is done with exit pupils between 1mm and 4mm
So while it is possible to add a Barlow, you might not like the resultant image. I strongly suggest you try one before purchase
Exit pupil is the diameter of the image produced at the eyepiece. This is determined by the telescope's aperture, divided by the magnification (i.e. 114/200 = 0.57mm). Generally the advice is to keep the exit pupil between 7mm and 0.5mm (any larger and light is lost outside your pupils, since young pupils maximally dilate to 7mm, smaller and floaters become very prominent). Most of my observing is done with exit pupils between 1mm and 4mm
So while it is possible to add a Barlow, you might not like the resultant image. I strongly suggest you try one before purchase
DON'T PANIC
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Re: greeting from 2nd days newbie.
ok noted thankscloud_cover wrote:One small note about increasing your magnification: Your telescope is a 114mm diameter, 1000mm focal length 'scope, which means that a 5mm eyepiece, producing 200x gives an exit pupil of 0.57mm, which is close to the smallest recommended exit pupil. Adding a Barlow will result in an exit pupil of 0.28mm, which is really tiny. At this magnification you might find floaters within your eye severely interferring with your image.
Exit pupil is the diameter of the image produced at the eyepiece. This is determined by the telescope's aperture, divided by the magnification (i.e. 114/200 = 0.57mm). Generally the advice is to keep the exit pupil between 7mm and 0.5mm (any larger and light is lost outside your pupils, since young pupils maximally dilate to 7mm, smaller and floaters become very prominent). Most of my observing is done with exit pupils between 1mm and 4mm
So while it is possible to add a Barlow, you might not like the resultant image. I strongly suggest you try one before purchase