7 replies to this topic

[RobertPettengill]

In addition to the 2009 posting on this topic by JimK in this Form, there are some recent posts and an older summary of Questar finder eyepiece compatibility on the Yahoo Forum.  I've taken all of this information and more to produce a single table of 3rd party eyepiece compatibility for the 3.5" Questar.  If you have any additions, corrections, or suggestions, let me know.

 

http://astronomy.rob...inderFocus.html

 

;rob

[JHollJr]

Rob, I just purchased a Televue adapter for my Questar 3.5 and a new 18.2mm DeLite eyepiece from Televue. I was out with it last night and found that it focuses quite nicely in the finder. I use it with Dioptrx and it gives very nice views.

[JonTeets]

Vendor     Model       Size    Focus Barrel Source

Meade      RG Ortho    7       No    1.25

Baader     Classic OR  6       No    1.25

Baader     Genuine OR  10      No    1.24

Fujiyama   OR HD       12.5    No    1.25

Zeiss      44 41 32    25      Out   .96

[RobertPettengill]

Rob, I just purchased a Televue adapter for my Questar 3.5 and a new 18.2mm DeLite eyepiece from Televue. I was out with it last night and found that it focuses quite nicely in the finder. I use it with Dioptrx and it gives very nice views.

 

Because non 20/20 vision can have an effect on whether the EP will focus for someone with normal distance vision, I want to be careful to make sure that new entries reflect the focus that someone will get with perfect or corrected vision.

 

My understanding is that using an eyepiece with Dioptrx with the 20/20 correction for your eye should be the same as what someone with 20/20 will experience.  Can you verify this for me? Are you able to focus without the Dioptrx using your normal corrective lenses?

 

;rob

[JHollJr]

Rob, I haven't tried the eyepiece without the Dioptrx. I'll have to get back to you on that one. 

[Billydee]

Rob and JHollJr,

 

Your eyeglasses are usually corrected for astigmatism so if you  view  wearing your glasses do not use the Dioptrx as it will double the correction.  When using no eyeglasses you correct your eye (the one you are viewing with) with the scopes focus (but not your astigmatism) (this is when it is necessary to use the Dioptrx when not using your glasses).

 

Bill

[JHollJr]

Bill, thanks. I have been using Dioptrx since about 2007 on and off; mostly off. Before I got them I went to my ophthalmologist to see if my eyes could be corrected. For reasons I won't go into they can't be. So I got bifocals without Progressive lenses instead thinking that I could just use my eyeglasses to correct the astigmatism. However, I never liked viewing with my eyeglasses and still don't so I bought the Dioptrx for three Televue eyepieces that I had at that time. And the rest is history as they say.

 

It is a brand new experience for me to use the Dioptrx with the Questar and I must say that it is quite nice to be able to tune out (by turning the Dioptrx) the astigmatism. I still wear bifocal eyeglasses with the line. I just got used to them, and like them more that progressives. Go figure.

[Billydee]

JHoltJr,

 

I'm is the same boat as you.  I have TriFocals (lines and all) and I tried to use the progressive ones but they actually made me cry due to one eye correcting to only 20/70 and the other one being able to correct to 20/15.  I also have a mild astigmatism.  I use a Dioptrx (adjusted for my good eye) and use the focus to adjusted my good eye to 20/15.  I actually prefer lined Trifocals.

 

Bill