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Posts Made By: david elosser

December 10, 2006 05:58 AM Forum: Beginning Astronomy?

Re: Does anyone know what 80-a & 80-b filters are

Posted By david elosser

You may have noticed how a redden sky looks darker and redder viewed through the blueish tint across the windshield of your car. Blue filters like the 80 series can do the same thing although the astronomical effect is much less striking. Blue filters work well on Mars and Jupiter. Some people use a light blue filter as an aid to splitting tight doubles. I would recommend getting a B+W brand filter. They make this in 46mm size, and I use a 48mm-46mm step down ring to put in on my 2" diagonal or my 2 to 1-1/4" adapter. I use the 81 and 85 series more often though. These "warnming" filters are particularly usefull on planets during the dawn and dusk hours, and I like using the 81A on Jupiter.

David E

December 14, 2006 10:44 AM Forum: Solar System Observing

Mystery Rille near crater Kies.../

Posted By david elosser

Hi everyone,
I was observing a 23.75 day old Moon this morning and noticed a feature around crater Kies. What I saw looked like a rille making a gentle arc between Kies and Kies A. Rukl map #53 does show what appears to be a wrinkle ridge in this location but what I saw was distinctly rille-like, with one wall apparently brightly lit by sunlight. At 200x I could also see a small darkened feature around the center of the suspected rille, which looked to me like a lunar pyroclastic deposit (LPD). Has anyone else studied this region and seen this feature as I described it? It's appearance was definately much more sharply defined than the other wrinkles in the immediate area. Thanks.

David E

December 18, 2006 03:56 PM Forum: Birding Optics and Photos

Look out below!

Posted By david elosser

Caught this female Cardinal in the act of landing on my bird feader.
David E

December 19, 2006 05:19 PM Forum: Binoviewers

Bino V Mono

Posted By david elosser

I had my first oppertunity to make a direct comparison of light grasp
between bino and mono modes in a telescope. Basically, this was my setup
last night:

SV102ABV with SV BV1 binoviewers (Norin made) and SV23mm FMC eyepieces.
NHII (80mm) with 14mm Orion Epic ED2 eyepieces.

Both combinations yield the same power, 34.3x. Also, by coincidence, both
setups yielded almost the exact same true field of view. The only real
unknown variable is the exact through-put of each eyepiece, but I think
since they are both "budget" eyepieces this should be close enough not to
be a factor. Now, the question is, which will yield a brighter image; the
SV102ABV with BV1 binos or the 80mm Nighthawk with single eyepiece? I evaluated
four open clusters in Auriga, the "Sword" of Orion, and various dim
(magnitude ~10 stars). Visual limiting magnitude was ~4 with no Moon but
lots of Christmas lights across the neighborhood creating more than
average light pollution.

I could easily see magnitude 9.5 stars with direct vision with both
scopes. Around mag 10 the stars entered averted vision and were again
about equal in both scopes. It should be noted that very careful alignment
and focusing of the binoviewers was neccessary to approach the performance
of the NHII on star targets. Going back and forth numerous times between
the scopes, there were occasions where I could see a slight edge in the
SV102ABV, but this could be due to changing atmospheric conditions.

On open clusters M37, M36, and M38 (moving eastward across Auriga), all of
these clusters appeared to have equal brightness. The dim open cluster NGC
1907 was a different story, however. With the light pollution this open
cluster appeared nebulous, that is, I could not resolve it into individual
stars. The apparent brightness of this cluster was slightly greater in the
NHII. But due to the fact that images appear larger in binoviewers than
they do through a single eyepiece at the same power, 1907 looked bigger
through the SV102 even though it was the same magnification as the NHII.
(So did nearby M38.) As a result, although slightly dimmer, 1907 was not
really harder to spot and view through the SV102ABV. I needed averted
vision to see this cluster in both scopes.

Then I went to M42. If I simply concentrated on the image brightness of
M42, it was about even. But, the SV102ABV through the binos showed a
larger apparent image scale, better contrast, and more comfortable viewing
using two eyes. As a result, it was much easier to pull detail from the
nebula. Oddly enough, M43 was actually a bit brighter and easier to see
through the binos, as was the dim reflection nebula around Nair al Saif.
This was probably due to better contrast. (Optical quality has to be taken
into account too, the SV102ABV is a doublet apo and the NHII is an 80mm
achromat.) I could see the entire Sword in the field of view of both

Bottom line, if I had a choice studying these targets it would be the
SV102ABV in bino mode, but overall image brightness was exceedingly close,
any differences being very slight. Certainly, even with a reduced image
brightness, aperture still rules, and details of the Sword of Orion were
more easily seen as a result. Hopefully, I will get another chance to view
other deep space objects with better skies to see if these results
continue to hold up. (I tried to be as objective as I could, but it's hard
to be objective when you are looking at the Great Orion Nebula through

David E

December 21, 2006 04:28 AM Forum: Birding Optics and Photos

Hawk in my yard

Posted By david elosser

I think this is a juvenile Cooper's Hawk.
David E

December 28, 2006 06:21 PM Forum: Birding Optics and Photos

Eastern Bluebird in Maple tree

Posted By david elosser

The bluebirds are plentifull in central North Carolina. Taken with a Fuji S5200 set at ISO 100 and hand held.

David E

January 6, 2007 06:44 PM Forum: Eyepieces

Meade 26mm 5K plossl

Posted By david elosser

I would like for anyone who owns the Meade 26mm 5000 series plossl to give me their opinions. The main two questions are about the edge of field sharpness and the true field of view. I was wondering if those two characteristics are about the same as a "standard" 32mm plossl. Thanks.
David E

March 2, 2007 09:42 AM Forum: Sports

NASCAR Rednecks

Posted By david elosser

People who watch Nascar races are toothless white trash rednecks, with junky cars in the front yard and would try to break the law, according to Democrat legistators in the state of Washington:

and here:

David E

March 3, 2007 03:04 PM Forum: Insects - Flowers and Other Small Stuff - Photos

Spring Buttercups

Posted By david elosser

My buttercups are in full bloom now here in central North Carolina.
David E

April 4, 2007 02:36 PM Forum: APM

6mm eyepiece

Posted By david elosser

Well, the 6mm TS Planetary I ordered from APM last week made it to the States today. Thanks Markus, for the great service. (I see you also sent a clear sky at no additional charge- nice touch!)

David E
North Carolina NC