The Right Eyepieces - Page 2

davidpretorius · #21 14-09-2005, 12:30 PM

http://www.precons.com/iis/gallery/N...olar%20System/

there is a jupiter avi there compressed into rar and winzip.

they were taken with my 1250 fl dob and a toucam in prime focus. they tell me that the toucam in prime focus is around 6mm . so doing the maths i am getting at least 208X magnification.

hope this helps

square_peg114GT · #22 14-09-2005, 01:19 PM

Quote:

Originally Posted by aaronsadler

Does anyone know how large in diametre Jupiter will physically appear at the eyepiece and what quality of view should be expected.

Not sure how large it will appear, but Jupiter is so low in the sky right now that it won't take more than about 100x. Just too much atmosphere. It'll look great at 250x next spring, but for this year the show is really over. Try those new EP's on Mars.

ausastronomer (John Bambury) · #23 14-09-2005, 01:49 PM

Aaron,

The 5mm Nagler is a great eyepiece, you will be very happy with it, the 2.5X TV powermate is a great barlow, you will also be very happy with it, but I have my doubts about the 2 working well together on a regular basis in your scope, as the combined magnification of 250X will be a test on the seeing conditions and on the scope. I mentioned the scope "should" run to 200X fairly easily but it may not be as comfortable at 250X due to its 4" aperture and the limits of the prevailing seeing conditions.

The 5mm Nagler as a native eyepice will work really well in that scope and be perfect for medium power views of everything. Barlowed in your 2X Orion Shorty Plus it should also give nice planetary views at 200X which should be attainable on most occasions, seeing dependant of course. Barlowed in the 2.5X Powermate may just be a bit much for it.

Personally I think your original choice of the 5mm Nag T6 and the 3.5mm Nag T6 was a better option as you will use the 140X of the 3.5mm a "LOT" more often than you could use 250X. Its unlikely you would get to barlow the 3.5mm Nag T6 in either barlow very often at all, if ever.

If you are hell bent on purchasing the 2.5X TV Powermate, which isnt a bad thing because it is the best barlow available IMO, I would consider selling the 2X Orion Shorty Plus and looking at either the 6mm TV Radian or 7mm Nagler T6 to use in conjunction with the 2.5X TV Powermate.

Really, for Lunar/Planetary viewing with that scope you need an eyepiece/eyepiece barlow combination that will give you between 180X and 210X, as this is where your scope and the atmosphere will be most comfortable and co-operative. You also need something to give 70X to 100X for medium power views and something around 140X to 150X would be great for upper end medium power views. For this reason I think your 1st thoughts with the 5mm NT6 and the 3.5mm NT6 are a very good option. Another thought is to buy the 5mm and 7mm Nag T6 which gives you 2 medium power options and 2 higher power options barlowed, you can do the sums I am sure.

CS-John B

davidpretorius · #24 14-09-2005, 01:53 PM

Great info John, as after starcamp in oct / nov, i will start down that path of some great eyepieces.

Thanks

aaronsadler · #25 14-09-2005, 06:17 PM

Thanks for that great advice john but will need some more dosh before purchasing different eyepieces. Will buy the 5mm and barlow now and later on get the 7mm and others. Thanks again every1.

Knew it would come as soon as I got the new stuff.

aaronsadler · #26 14-09-2005, 09:25 PM

Anyone know of a good finder scope, preferably televue.

Looked in bintel but couldn't find any.

[1ponders] (Paul) · #27 15-09-2005, 12:29 AM

Couldn't find a Tele Vue finder but did come across these. The first is a beauty if you want to spend that much on a finder http://www.optcorp.com/product.aspx?...ele%20Vue&st=2 and the second is a Tak finder http://www.optcorp.com/product.aspx?...kw=finder&st=1 Ouch

aaronsadler · #28 15-09-2005, 12:22 PM

Had thought about the tv60 before, a bit expensive as a finder at the moment.

The takakashi looks great though, are those prices in american dollars and does anyone in aus sell them.

[1ponders] (Paul) · #29 15-09-2005, 12:44 PM

I did a quick and rough google and came across this site http://www.astronomy-electronics-centre.com.au/ I don't know what they are like.

aaronsadler · #30 15-09-2005, 01:01 PM

I found the product but no price thanks anyway, I'm guessing those prices before were american

[1ponders] (Paul) · #31 15-09-2005, 01:19 PM

From the OPT site? Definately American. Great site and good service though.

aaronsadler · #32 15-09-2005, 01:34 PM

How would you recommend using those laser pointers as a finder, in your oppinion are they better than a normal finder scope.

[1ponders] (Paul) · #33 15-09-2005, 01:38 PM

It might be a good idea to start a new thread on the laser topic Aaron. I'm sure there will be others out there that are interested in the topic and it would get buried here under the wrong thread label. Your thread, but just a thought. If you like I can create a new thread and move the last few posts there.