WO w/26mm SP
Posted 27 January 2013 - 10:42 AM
I then noticed the field stop was better defined in the older one which was marked "Japan" and the other was China. Anyway, I focused them individually and was able to merge them ok. The field was not as wide as the 20mm 66* and lower power, but was able to fit the whole moon in the view. Very nice image and sharper on the 20mm...I like them:)
Posted 31 January 2013 - 01:07 PM
The 25mm plossls have a permanent place in the bv carrying case.
Posted 05 February 2013 - 11:37 PM
Posted 06 February 2013 - 08:17 AM
Just wanted to make sure that you understood this.
If you lower the power, you make the exit pupil bigger, which will make the moon actually appear brighter, not dimmer.
As for being washed out, I can't comment on whether an eyepeice change will fix that (I doubt it because it was most likely atmospheric or something else), but when you lower the magnification, the image gets brighter, not dimmer.
Also, I find the moon to be dimmer for a given power when using binoviewers than when using Mono because each eye only receives slighly less than half the light.
My guess is that you got some snow blindness perhaps because you were partially or fully dark adapted when you switched to the moon.
Finally this... You did not say your age, but it is possible that if you are older, you may have initial cateract formation. If it is in your non-dominant eye, and now that eye is in use, the clouding caused by the cataract can no show up in the image.
Only listing it as a possibility.. I know I am in this position. I have cataracts forming. I normally mono-view with my right eye (even though I am left eye dominant), but when I use both eyes, I can see the effects of the cataract that is developing in my right eye.
Posted 06 February 2013 - 10:11 AM
Thanks for your input, I am 64 and my eyesight is pretty good overall with a low prescription for distance. I have always noticed that my dominant right eye sees shades of grey differently than the left. I mainly use the right eye for mono viewing and just started in the binoviewr in the last year.
I notice that when viewing DSO's my left eye seems to see better contrast and a little fainter stars better? Last check with my eye doctor, he said my eyes where in good health for my age. Will check closer on my next exam for and start of a cataract developing. Do you know how long they normally take to form to get to the point of removal?
We are going to have a very clear and good seeing tonight, so I will take out the BV and try them on some brighter star clusters and M42 with both sets of EP's and take some notes.