Meade 2045 4" SCT
Posted 28 March 2005 - 12:13 PM
I am considering a purchase and I would like to use a 2" diagonal and 2" EPs with the scope to get a larger FOV. Are there issues or limitations to this scope that I should be aware or look for? I do undestand that this scope was potentially made 15-20 (or more) years ago.
Thanks in advance,
Posted 28 March 2005 - 01:07 PM
Posted 28 March 2005 - 02:35 PM
Keeping the back optical path short will give you a wider field of view, though (compare the "straight-through" mode with your lowest power eyepiece and the "diagonal-view" and you will see the effect on the field of view of the extra optical length of the diagonal). A 2" diagonal has a longer optical path than a 1-1/4", so will actually vignette the image more.
The scope was often good enough to justify an upgrade diagonal from the original, so keep that in mind.
Here is another thread about a similar 4" aperture scope.
Travel down the thread to find my comments about keeping the optical path short.
good luck. I think you'll enjoy the scope. I wish I still had mine.
Posted 28 March 2005 - 04:13 PM
The resaon I am looking at this particular scope/model was because I already have a number of 2" accessories for my 8" SCT (e.g. diagonal, visual back, EPs, Crayford focuser, focal reducer, filters, etc.) I was hoping to get wider FOV with the scope and potentially mount it on my 8" SCT.
I would like to "try before I buy" and want to set my expectations. However, both your feedback has indicated that the FOV would be less than 2 degrees (~ 1.82 degrees with a 1.25" field stop). I was hoping to get near 3 degrees. Therefore, it sounds like I may be better off getting a ST refractor that can take 2" EP to mount on my SCT.
Thank you again,
Posted 28 March 2005 - 05:53 PM
Posted 29 March 2005 - 09:56 AM
Posted 29 March 2005 - 09:51 PM
Posted 31 March 2005 - 08:32 AM
The Megrez II Semi-APO is now offered with a can't refuse package deal.
I was debating this very thing... how long until Father's Day? Pehaps I could buy it now and promise not to use it until then!