I've had a GS52 scope with an HDF eyepiece for a while now but (although I'm veryhappy with it) was curious to know whether an SDL would give a significant improvement.
I've read the comments on here, but have just realised that there are 2 SDL zooms both with the same magnification range but with differing fields of view and, it is claimed, different eye reliefs and differing resolutions. The part numbers are different 40935G and 40936G but otherwise they are hard to distinguish.
This proabably exxplains why, when I look up the prices for SDL zooms I get very different prices from different retailers. So, if you are trying to buy one, be sure that you are getting what you think you are.
I find this very confusing, couldn't they have been called something different? Is one being phased out and the other in?
Also, any comments on their relative merits?
Another question -field of view. Is the field of view proportional to magnification in a zoom? I was trying to compare the fields of view of a 24WW (40858G) with that of an HDF zoom at a similar magnification. If it is proportional, then there should not be a huge difference. 45.5(zoom0 to 49 fixed. The reason I'm curious is that I've preferred fixed eyepieces in the past but tried a zoom on the GS52. I did try both before I bought, but since the magnification on the barrel of a HDF zoom is not given for a 52 dia scope it was hard to accurately compare the 2
I've read the comments on here, but have just realised that there are 2 SDL zooms both with the same magnification range but with differing fields of view and, it is claimed, different eye reliefs and differing resolutions. The part numbers are different 40935G and 40936G but otherwise they are hard to distinguish.
This proabably exxplains why, when I look up the prices for SDL zooms I get very different prices from different retailers. So, if you are trying to buy one, be sure that you are getting what you think you are.
I find this very confusing, couldn't they have been called something different? Is one being phased out and the other in?
Also, any comments on their relative merits?
Another question -field of view. Is the field of view proportional to magnification in a zoom? I was trying to compare the fields of view of a 24WW (40858G) with that of an HDF zoom at a similar magnification. If it is proportional, then there should not be a huge difference. 45.5(zoom0 to 49 fixed. The reason I'm curious is that I've preferred fixed eyepieces in the past but tried a zoom on the GS52. I did try both before I bought, but since the magnification on the barrel of a HDF zoom is not given for a 52 dia scope it was hard to accurately compare the 2