Digiscoping : Moon 10/04/09

[mdzmr]

Moon Digiscoping on 10/04/09
Using Dlux4 + Universal Mount + Celestron C90 Mak scope 1250mm f13 + 32mm eyepiece projection with baader Moon & Skyglow filter

[Qazwer]

Sorry, I just like to know why did you crop the bottom bit of the moon?

[mdzmr]

Its not crop. Just that I can't manage to capture the whole moon. need to use 20mm eyepiece or 12mm eyepiece.

[Adammax]

The details of the moon is really showing.

mdzmr, care to share your experience in digiscoping? I'm keen to venture into this area, with wildlife/birds as main subject.

[mdzmr]

Originally Posted by Adammax The details of the moon is really showing. mdzmr, care to share your experience in digiscoping? I'm keen to venture into this area, with wildlife/birds as main subject.

Take sometimes for setting up especially if you are new to it. Focusing wise will be a bit tough but for wildlife or birding will be slightly lesser ur burden a bit only. Using this method for wildlife or birding only allow you to do a stationary objects. You unable to do panning shots due to your focusing not like normal telephoto lens. Even though, there few photog manage to do it( don't know how they do it). The advantage of doing digiscope, it give you bigger aperture setup.

I suggest if you want get this kind of setup, try to get a spotting scopes which is more for daytime terrestrial and also wildlife purposes which is also more lighter and compact compare to telescopes.

[Adammax]

Originally Posted by mdzmr Take sometimes for setting up especially if you are new to it. Focusing wise will be a bit tough but for wildlife or birding will be slightly lesser ur burden a bit only. Using this method for wildlife or birding only allow you to do a stationary objects. You unable to do panning shots due to your focusing not like normal telephoto lens. Even though, there few photog manage to do it( don't know how they do it). The advantage of doing digiscope, it give you bigger aperture setup. I suggest if you want get this kind of setup, try to get a spotting scopes which is more for daytime terrestrial and also wildlife purposes which is also more lighter and compact compare to telescopes.

Thanks for the advice. Is fieldscope similar to spotting scope? Recently Nikon has just released 2 new scopes in their inventory.

[mdzmr]

I don't have the answer to compare between spotting and field scope yet. Maybe some pros can help you to answer. Technically its a similar or maybe spotting scope gives you more magnification.

Ya, Nikon scope I shall say its more reliable. Infacts there a quite a wide range of brand in the market.

[mdzmr]

As my scope is capable in both day and night use.

[weixing]

Hi,
What is Dlux4?? Is it a compact camera??

Originally Posted by mdzmr Its not crop. Just that I can't manage to capture the whole moon. need to use 20mm eyepiece or 12mm eyepiece.

You need a longer focal length eyepiece, not a shorter focal length eyepiece. But 32mm eyepiece is already the longest focal length that will give you the lowest power and widest field of view for a 1.25" eyepiece. You can try the 40mm 1.25" eyepiece, but I think might still not be able to cover the whole Moon if your 32mm can't. To cover the whole Moon using digiscoping method, you need a shorter focal length scope. If you had a DSLR, prime focus using your C90 Mak will be easier to cover the whole Moon.

Anyway, nice shot!

Have a nice day.

[mdzmr]

Originally Posted by weixing Hi, What is Dlux4?? Is it a compact camera?? You need a longer focal length eyepiece, not a shorter focal length eyepiece. But 32mm eyepiece is already the longest focal length that will give you the lowest power and widest field of view for a 1.25" eyepiece. You can try the 40mm 1.25" eyepiece, but I think might still not be able to cover the whole Moon if your 32mm can't. To cover the whole Moon using digiscoping method, you need a shorter focal length scope. If you had a DSLR, prime focus using your C90 Mak will be easier to cover the whole Moon. Anyway, nice shot! Have a nice day.

Thanks weixing, I did before with DSLR using prime focus, no problem to capture the whole moon, just want to try with PnS cam. Next going to try with web cam and also CCD cam.

Dlux4 is a Pns cam by Leica.

[mdzmr]

Originally Posted by weixing Hi, You need a longer focal length eyepiece, not a shorter focal length eyepiece. But 32mm eyepiece is already the longest focal length that will give you the lowest power and widest field of view for a 1.25" eyepiece. You can try the 40mm 1.25" eyepiece, but I think might still not be able to cover the whole Moon if your 32mm can't. To cover the whole Moon using digiscoping method, you need a shorter focal length scope. If you had a DSLR, prime focus using your C90 Mak will be easier to cover the whole Moon. Anyway, nice shot! Have a nice day.

Sori to ask, Is it 20mm eyepiece suppose to be wider than 32mm eyepiece?

[weixing]

Hi,

Originally Posted by mdzmr Thanks weixing, I did before with DSLR using prime focus, no problem to capture the whole moon, just want to try with PnS cam. Next going to try with web cam and also CCD cam. Dlux4 is a Pns cam by Leica.

Oh... that Dlux4... no wonder it's sound familiar, but just can't recall it... ha ha ha

Anyway, those camera that can take video are best for taking lunar and planetary image. You should try it... the result are really amazing after stacking.

Have a nice day.

[weixing]

Hi,

Originally Posted by mdzmr Sori to ask, Is it 20mm eyepiece suppose to be wider than 32mm eyepiece?

No... 20mm will usually give you narrow field of view unless the 20mm eyepiece's apparent field of view is larger than your 32mm.

The two specification of eyepiece that determine field of view are:
1) eyepiece's focal length, and
2) eyepiece's apparent field of view (in degree).

To determine the magnification and actual field of view of a specific scope and eyepiece are:
1) Magnification = Scope's Focal Length / Eyepiece's Focal Length
2) Actual Field of View (in degree) = Eyepiece's Apparent Field of View (in degree) / Magnification

As you can see, the shorter eyepiece's focal length, the higher the magnification and thus the smaller the actual field of field.

The most common eyepiece's apparent field of view are:
1) 50/52 degree for Plossl or similar design
2) 60 - 70 degree for wide field eyepiece
3) ~82 degree for ultra wide eyepiece
4) ~100 degree for super ultra wide eyepiece.

Have a nice day.

[mdzmr]

Thanks weixing, I know which one you refering to. I intend to get one at Astrobargain. But confuse and cannot make-up my mind which one to get.

[Qazwer]

Originally Posted by mdzmr Its not crop. Just that I can't manage to capture the whole moon. need to use 20mm eyepiece or 12mm eyepiece.

So it's not delibrate.

Anyway, I would prefer it sharpened a little more.

[Adammax]

Looks like a very informative discussion, but I dont quite understand.

Is there any good reputable shop which sells digiscope products? Would like to venture into digiscoping.

[mdzmr]

Originally Posted by Adammax Looks like a very informative discussion, but I dont quite understand. Is there any good reputable shop which sells digiscope products? Would like to venture into digiscoping.

Can check here:
http://www.mcgill.com.sg/shop/produc...3d2ffc549f1b3e

[mdzmr]

Originally Posted by weixing Hi, No... 20mm will usually give you narrow field of view unless the 20mm eyepiece's apparent field of view is larger than your 32mm. The two specification of eyepiece that determine field of view are: 1) eyepiece's focal length, and 2) eyepiece's apparent field of view (in degree). To determine the magnification and actual field of view of a specific scope and eyepiece are: 1) Magnification = Scope's Focal Length / Eyepiece's Focal Length 2) Actual Field of View (in degree) = Eyepiece's Apparent Field of View (in degree) / Magnification As you can see, the shorter eyepiece's focal length, the higher the magnification and thus the smaller the actual field of field. The most common eyepiece's apparent field of view are: 1) 50/52 degree for Plossl or similar design 2) 60 - 70 degree for wide field eyepiece 3) ~82 degree for ultra wide eyepiece 4) ~100 degree for super ultra wide eyepiece. Have a nice day.

Hi weixing, Is there any difference in magnification of using 20mm Plossl 52deg between 20mm Wide 67deg? or is it the difference is only the Actual field of view?

[weixing]

Hi,

Originally Posted by mdzmr Hi weixing, Is there any difference in magnification of using 20mm Plossl 52deg between 20mm Wide 67deg? or is it the difference is only the Actual field of view?

The magnification is the same... only the actual field of view is different. Below is an picture to show this:


Have a nice day.

[mdzmr]

Originally Posted by weixing Hi, The magnification is the same... only the actual field of view is different. Below is an picture to show this: Have a nice day.

Ok thanks, if that the case I will get the wide angle eyepiece.