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Orion's Sword

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#1 stratocaster



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Posted 22 January 2013 - 12:55 PM

Last night when I saw the proximity of the moon and Jupiter I thought I'd take out my SV102ED and do some quick observing. The two were framed nicely in my ES20/100 and it was a beautiful sight. Then I took a quick look at Rigel at varying powers. Then I went to M42 and looked to see if I could see E and F in the trapezium (I could make out E, but no F).

But then I popped the ES20/100 back in to look at the nebula, not really considering the tfov I'd have with that eyepiece/scope combination. The entire sword of Orion filled the view and it took me aback. It was really beautiful. I realized I hadn't done that type of wide angle viewing in the vicinity of M42 before. I then tried my ES30/82 to get even a bit wider tfov. To my surprise the view lost its grandeur. The smaller afov and the reduced magnification really took the wind out of the sails. Perhaps the brighter sky in the view as a result of the larger exit pupil also had a negative affect.

But the view in the ES20 was great.

#2 GlennLeDrew


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Posted 23 January 2013 - 01:09 AM

I know what you mean. In my home-made right angle bino in the 60mm configuration with 13mm Ethoi, the exit pupil is a tad under 3mm, the magnification is 20.8X and the TFoV is 4.7 degrees. For larger objects and structures, the view is grand indeed! Especially with two eyes on the job.

#3 Starman81



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Posted 24 January 2013 - 12:24 AM

I think I have tried every single EP in my sig on The Sword and love all the views but like you said especially those that get the sky background dark along with a super wide AFOV and decent power.

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