Paul;
Great job. This looks much better to me.
Now, of course, you gotta factor in lens sharpness and distortion at
wide open apertures.
George
PS: No 350/2.8 meteor hunting for me. Now, scope-guided galaxy and
nebula hunting is a different story.
Pauls0627@xxxxxxx wrote:
>
> In a message dated 6/8/99 12:34:37 PM Eastern Daylight Time,
> george@xxxxxxxxxxxxxxxxxx writes:
>
> > He's got the speed right, but using his calculation,
> > a 100/2 is 4 times better than a 24/2 ?? Well, maybe if you're
> > prescient enuf to point the 100 at the exact spot where the meteor will
> > streak by. Carrying his calculations further, the ultimate Zuiko for
> > meteors is the 250/2 @ 62.5. Somehow that doesn't work for me.
>
> Me either. Seems more like you should be multiplying the square of the
> aperture by the focal length, with lower numbers being better. Sky coverage
> is directly proportional to focal length, right? And light grasp a function
> of the square of the aperture. So this gives, in order from best to worst:
>
> 50/1.2 = 72
> 21/2 = 84
> 24/2 = 96
> 50/1.4 = 100
> 28/2 = 112
> 35/2 = 140
> 40/2 = 160
> 50/1.8 = 162
> 24/2.8 = 192
> 18/3.5 = 221
> 28/2.8 = 224
> 21/3.5 = 257
> 35/2.8 = 280
> 85/2 = 340
> 100/2 = 400
> 180/2 = 720
> 100/2.8 = 800
> 135/2.8 = 1080
> 135/3.5 = 1654
> 180/2.8 = 1440
>
> and for George:
>
> 250/2 = 1000
> 350/2.8 = 2800
>
> Leave the big 350 home if you're looking to catch meteors, George.
>
> Actually, this pecking order is about what I would expect, with the fast
> wides at the top. A little surprised that the 50/1.2 did so well though.
>
> Thi sis more along the lines of what I would expect.
>
> Paul (waiting to try out his new 24/2 on the Perseids in August) Schings
> Coventry, Rhode Island USA
>
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