Stellarvue Finder

[Mike Q]

https://www.stellarvue.com/1-stellarvue ... der-scope/

I do think i will be doing this at some point this year

[messier 111]

a very high quality instrument, in my opinion.

[Mike Q]

a very high quality instrument, in my opinion.

I have the 13x80 on my 16 inch, so i can atest to the quality of the instrument.

[RitcheyPark]

I have 4 Stellarvue finders. All top quality.
Their finderscope rings are are top
quality too.

[OzEclipse]

https://www.stellarvue.com/1-stellarvue ... der-scope/

I do think i will be doing this at some point this year

Sorry to again be a party pooper......

10x60mm has a 6mm exit pupil. Fine if you are under 40 years old. If you are 60ish and have a typical 5mm pupil dilation, you will get exactly the same light transmission as the light from a 10x50mm finderscope.

Similarly, your 13x80mm finder is in reality acting as a 13x67mm finder. If you can swap the eyepiece to get 16X magnification, you will get 80mm aperture worth of light into your eyes.

It appears as though you can easily exchange the supplied eyepieces to give you(Mike) 12X magnification in the 60mm and 16x in the 80mm, then you will get all the light from the optic. Steve(Bushman). You probably need to go up to 15-16x in the 60mm.

Otherwise you are just adding extra weight and cost for no performance benefit over a smaller finder.
Here is a list of minimum finder magnifications with aperture and age/pupil dilation.

Cheers
Joe

[Mike Q]

https://www.stellarvue.com/1-stellarvue ... der-scope/

Joe, it is a good thing that i am not typical then. My pupils open up to a very solid 7 mm, at least this is what my eye doctor says. Which in part explains my freakishly good night vision.
I do think i will be doing this at some point this year

Sorry to again be a party pooper......

10x60mm has a 6mm exit pupil. Fine if you are under 40 years old. If you are 60ish and have a typical 5mm pupil dilation, you will get exactly the same light transmission as the light from a 10x50mm finderscope.

Similarly, your 13x80mm finder is in reality acting as a 13x67mm finder. If you can swap the eyepiece to get 16X magnification, you will get 80mm aperture worth of light into your eyes.

It appears as though you can easily exchange the supplied eyepieces to give you(Mike) 12X magnification in the 60mm and 16x in the 80mm, then you will get all the light from the optic. Steve(Bushman). You probably need to go up to 15-16x in the 60mm.

Otherwise you are just adding extra weight and cost for no performance benefit over a smaller finder.
Here is a list of minimum finder magnifications with aperture and age/pupil dilation.

FINDERSCOPE MIN MAGS.jpg

Cheers
Joe

[OzEclipse]

https://www.stellarvue.com/1-stellarvue ... der-scope/

Joe, it is a good thing that i am not typical then. My pupils open up to a very solid 7 mm, at least this is what my eye doctor says. Which in part explains my freakishly good night vision.
I do think i will be doing this at some point this year

Sorry to again be a party pooper......

10x60mm has a 6mm exit pupil. Fine if you are under 40 years old. If you are 60ish and have a typical 5mm pupil dilation, you will get exactly the same light transmission as the light from a 10x50mm finderscope.

Similarly, your 13x80mm finder is in reality acting as a 13x67mm finder. If you can swap the eyepiece to get 16X magnification, you will get 80mm aperture worth of light into your eyes.

It appears as though you can easily exchange the supplied eyepieces to give you(Mike) 12X magnification in the 60mm and 16x in the 80mm, then you will get all the light from the optic. Steve(Bushman). You probably need to go up to 15-16x in the 60mm.

Otherwise you are just adding extra weight and cost for no performance benefit over a smaller finder.
Here is a list of minimum finder magnifications with aperture and age/pupil dilation.

FINDERSCOPE MIN MAGS.jpg

Cheers
Joe

Hi Mike,
I presume you are referring to a measure after the use of tropicamide or cyclopentolate eye drops by your ophthalmologist to dilate your pupils. This is not an accurate measure of your dark adapted pupil dilation. Mine also open to 7mm with chemical assistance, yet they only dilate to 4.8-5mm in observing conditions.

The method I described in the article I published last year is the only accurate way to determine a measure relevant to astronomical observing.

https://theskysearchers.com/viewtopic.p ... 77#p280632

cheers
Joe

[Mike Q]

You assume wrong, that is my normal, no chemical assistance required

[Mike Q]

Wouldnt you know it, i go to order the 10x60 and the one i wanted is now wait listed. Oh well it can wait, there are other things to spend my money on that are probably more important

[Mike Q]

So i received a email from Vic at Stellarvue thanking me for asking the question as to when the 10x60 black finders would be back in stock, because they are in stock and there was a data entry error. So the finder, ring set and illuninator has been ordered and they will ship tomorrow. I should have them buy the middle of next week. YES!!!