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Re: Polar alignment (was: Which G-11 should I get?- Paul K


Jun 14, 2005

 


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#26021 Jun 14, 2005

--- In Losmandy_users@yahoogroups.com, "Paul K" pkane2001@h...>

wrote:



Well said Paul well said!



How are you doing with the new SBig ST10XE & Tec40 combo?



Cheers,



Chris A > Bill,

>

> I hope I'm wrong, but you appear a little close-minded about this

> whole topic.

>

> Drift alignment does work and is an excellent, low-tech way of

> achieving polar alignment. There are now many hi-tech ways of

doing > it. Some are faster, some are more precise, and some are both.

>

> Citing works published years ago accomplishes very little, as many

> of the newer methods have been developed in the past couple of

years. >

> PAC is one of them, as is PoleAlignMax. Takahashi mounts have a

> computer controlled polar finder that's extremely precise. T-Point

> is an excellent way to do it, and most professional observatories

> use it or a similar method -- they don't drift align. By the way,

> PAC works on the same principle as T-Point, just fewer modeling

> terms.

>

> I'd have to say that drift alignment is only one of many excellent

> methods available to us today.

>

> I would not recommend making such categorical statements about

other > alignment methods until you try them yourself.

>

> Just my $0.02.

>

> Regards,

>

>

> -Paul

>

> --- In Losmandy_users@yahoogroups.com, "William R. Mattil"

> wrmattil@i...> wrote:

> > Chris Appleton wrote:

> >

> > >

> > >Hi Teri and Bill

> > >

> > >The PAC works excellent and is much easier and faster then

doing > a

> > >drift align.

> > >

> >

> > But not better ... and that is exactly my point.

> >

> > > I can image for up to 3 min unguided and 15 min guided

> > >(have not tried any longer due to seeing no benefits in my

area) > > >with my G11/Gemini.

> > >

> > >

> >

> > Again irrelevant. Unless of course one is going to limit

> themselves to

> > 15 minute exposures :)

> >

> > >Bill, I'm just curious where you live that would permit one

hour > of

> > >a single exposure (no planes, satelites or light pollution)??

> > >

> >

> > Chris, I'm confused by your apparent naivete here. You do

realise > that

> > there are many, many astrophotographers that bundle up the mount

> and

> > gear and travel regularly to nice dark environs ? There are

> precious

> > few people that live under mag 6-7 skies. So what do you think

> the rest

> > of us actually do ? Why is it that you think that this PAC (or

> whatever

> > it's called) is simply magical and instantly allivates the need

> to

> > carefully align to the pole ? I would recommend that you take a

> few

> > minutes and research this. I highly recomend

> >

> > A Manual of Advanced Celestial Photography by Wallis and Provin

> > Widefield Astrophotgraphy by Robert Reeves

> >

> > And then take the time to observe what other pioneers in this

> pastime

> > have done and how they practice it. You will find that every one

> of them

> > drift align. I am amazed that my taking the time to pass along

> wisdom

> > passed down to me by others would be met with such resistance.

> You can

> > practice your photography any way that you like. But do not

waste > > bandwidth here by suggesting that drift aligning a mount is

> *wrong*.

> > Drift aligning a mount will *always* work. Period. PAC might,

and > might

> > not work. Have you ever actually drift aligned a mount ? I am

not > trying

> > to be pendantic here .... seriously. A lot of people are somehow

> afraid

> > of doing it. Probably because thay don't understand it. Most of

us > are

> > drift aligned and ready to take exposures of up to two hours

> before it's

> > actually dark enough to open a shutter anyway. So there isn't

any > real

> > time lost in doing so. Hopefully you aren't so into instant

> > gratification that you can't see that this is part of the

process > and as

> > such it is to be enjoyed.

> >

> > > Are

> > >you doing film?

> > >

> > I do film and CCD and I will not change my proceedure based upon

> the

> > medium with which I am capturing photons.

> >

> > > With today's ccd camera's sensitivity, you do not

> > >have to go beyond 10 to 15 min sub-exposures and then stack

them. > > >

> > >

> >

> > Ahh I see you are an expert in CCD then ? :) are you a published

> author

> > and might we read your rationale behind this statement ? laughs>

> >

> > You have undoubtedly missed the entire point .......... but I'll

> try

> > again ..... you align your mount however you want and place a

35mm > > camera at the prime focus and open the shutter for a one hour

> exposure

> > and then inspect the results. You might be surprised by your

> results....

> > I won't though because my (and thousands of others) process

works > 100%

> > of the time. And that sir is exactly my point.

> >

> > >Teri, go for the Gemini you will not regret it.

> > >

> > >

> >

> > Somehow my statement has been interpreted as "Don't get the

> Gemini" ????

> > Not hardly. I have a Gemini and it performs well. And after

drift > > aligning can handle in excess of one hour exposures on

film ..... > And I

> > have plenty of photographic evidence to support my claims.

> >

> > And another point .... stacking images while extremely useful in

> > increasing S/N is not a cure-all for everything. Technique

however > is.

> > Stacking is a useful techique once the other issues are solved.

> >

> > We now return to our regularly scheduled programming :)

> >

> > Bill

> >

> > --

> >

> > William R. Mattil.:.www.celestial-images.com







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