[ap-gto] Re: 600gto for astrophotography


Mar 16, 2000

 


----------------------------

#348 Mar 16, 2000

Hello fellow astrophotographers,

I've the 6oogto with 130f6 and use a 60mm guide scope combo. I'm new at

this game and have only tried 15 min. shots so far. I'm using the

wooden tripod for now. When I move up to the 155f7 EDFS I understand

the 900 would be a much more stable platform. To get the most out of

the 6oo mount I will get the pier. AP is sold out of 48in piers for a

couple of months, so I was wondering if anybody is using the 54in pier

with the 600gto/155f7 combo? I'm 6ft tall, but wonder if the 54in pier

will be too tall?

Assuming only 35mm format and lets say winds no more than 5mph, what is

your definition of casual vs. serious astrophotgraphy limits? I'm sure

I fall into the casual catagory since more than 75% of my time is

visual. If I have the paitence I would like to work my way up to 60min.

manually guided shots.

Can I get by with the 60mm guide scope with the 155 for manual guiding?

I would appreciate any comments on this setup.

Stephen



----------------------------

#354 Mar 17, 2000

I'm speaking a bit out-of-turn here because I don't use guidescopes only

off-axis guiders; but you should do just fine with the 60mm guidescope. The

glory of the guidescope is its ability to be tweeked independently of the

imaging scope. So the smaller apreture shouldn't ever be a problem since you

will have so much flexability in finding guidestars.

Bobby Middleton



www.koyote.com/users/bobm/astro1.htm

> Assuming only 35mm format and lets say winds no more than 5mph, what is

> your definition of casual vs. serious astrophotgraphy limits? I'm sure

> I fall into the casual catagory since more than 75% of my time is

> visual. If I have the paitence I would like to work my way up to 60min.

> manually guided shots.

> Can I get by with the 60mm guide scope with the 155 for manual guiding?

> I would appreciate any comments on this setup.

> Stephen

>



----------------------------

#357 Mar 17, 2000

I've the 6oogto with 130f6 and use a 60mm guide scope combo. I'm new at

> this game and have only tried 15 min. shots so far. I'm using the

> wooden tripod for now. When I move up to the 155f7 EDFS I understand

> the 900 would be a much more stable platform. To get the most out of

> the 6oo mount I will get the pier. AP is sold out of 48in piers for a

> couple of months, so I was wondering if anybody is using the 54in pier

> with the 600gto/155f7 combo? I'm 6ft tall, but wonder if the 54in pier

> will be too tall?



I'm 6'2" tall and use the 155 EDFS/900GTO combo (a little taller than the

600, I believe) on the 54" pier. I can view to the horizon standing and can

view at the zenith without crawling on my knees. It's quite doable, but if

you have any observing friends any shorter, it will be too tall when viewing

near the horizon. And you won't be doing much viewing seated. If you plan on

using a shorter scope on the mount/pier combo, I'd go for the 48". Since I

will be using a C-11 and a Mak-Cass on mine, I am going to sell the 54" and

go to a 48".



Gus



----------------------------

#363 Mar 17, 2000

A 60mm guidescope can certainly work for manual guiding, though my preference

has been 80mm. I prefer to select a guidestar that is within the

field of the image, to minimize the chances of field rotation (good polar

alignment is important). An 80mm just gives you a brighter selection of stars,

at a high enough magnification (200X or higher) to make guiding easier.



In any case, a 60mm guidescope is pretty cheap and you can always upgrade later.





Bob Luffel

>

> Hello fellow astrophotographers,

> I've the 6oogto with 130f6 and use a 60mm guide scope combo. I'm new at

> this game and have only tried 15 min. shots so far. I'm using the

> wooden tripod for now. When I move up to the 155f7 EDFS I understand

> the 900 would be a much more stable platform. To get the most out of

> the 6oo mount I will get the pier. AP is sold out of 48in piers for a

> couple of months, so I was wondering if anybody is using the 54in pier

> with the 600gto/155f7 combo? I'm 6ft tall, but wonder if the 54in pier

> will be too tall?

> Assuming only 35mm format and lets say winds no more than 5mph, what is

> your definition of casual vs. serious astrophotgraphy limits? I'm sure

> I fall into the casual catagory since more than 75% of my time is

> visual. If I have the paitence I would like to work my way up to 60min.

> manually guided shots.

> Can I get by with the 60mm guide scope with the 155 for manual guiding?

> I would appreciate any comments on this setup.

> Stephen

>

>

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----------------------------

#366 Mar 17, 2000

Hi Gus,

Thanks for the input. I figured that most folks use the 48in pier. I set up

my tripod at 54in with the 130f6 to get a feel for it. Crawling on my knees

and trying to guide manually is uncomfortable. Maybe easier to stand, I

guess you need to choose objects that allow you to sit is the key, easier

said than done. Even though the 155f7 is longer, the guidescope still will

remain at the same position, so I need to consider this some more. I can

see where the 80mm GS would be easier to use just because it is longer. Time

to bring out the stepstool for the shorter observers would solve the horizon

problem, except when they grab on the diagonal to get their balance. I don't

have any future plans for a shorter scope, if so then I will have to use the

tripod. Even if I buy the 54in pier, maybe you can just buy the center

section only.

Stephen

>I'm 6'2" tall and use the 155 EDFS/900GTO combo (a little taller than the

>600, I believe) on the 54" pier. I can view to the horizon standing and can

>view at the zenith without crawling on my knees. It's quite doable, but if

>you have any observing friends any shorter, it will be too tall when

viewing >near the horizon. And you won't be doing much viewing seated. If you plan

on >using a shorter scope on the mount/pier combo, I'd go for the 48". Since I

>will be using a C-11 and a Mak-Cass on mine, I am going to sell the 54" and

>go to a 48".

>

>Gus







----------------------------

#367 Mar 17, 2000

In a message dated 3/17/2000 2:38:25 PM Eastern Standard Time,

sjruss55@... writes:

> Time

> to bring out the stepstool for the shorter observers would solve the

horizon > problem, except when they grab on the diagonal to get their balance. I

don't > have any future plans for a shorter scope, if so then I will have to use

the > tripod. Even if I buy the 54in pier, maybe you can just buy the center

> section only.

> Stephen



Stephen,

Yes you can buy the pier post only. I have a 900GTO and a 54" pier and

bought a 42" pier section with tension rods. You probably could get away

with only one set of rods, depending on the heights. I plan on using the 54"

pier with a refractor and the 42" pier with a SCT.



Dave Messier



David P. Messier

members.aol.com/dpmessier/



----------------------------

#368 Mar 17, 2000

Hi Dave,

I'll give AP a call to get the details on the tension rods.

Thanks, thought you interchange the piers since legs were the same.



Stephen







>Stephen,

>Yes you can buy the pier post only. I have a 900GTO and a 54" pier and

>bought a 42" pier section with tension rods. You probably could get away

>with only one set of rods, depending on the heights. I plan on using the

54" >pier with a refractor and the 42" pier with a SCT.

>

>Dave Messier



----------------------------

#369 Mar 17, 2000

Hi Bob,



I bought that 60mm GS from AP three years ago for the SDF and 130. With a

Tak 5mm Guide eyepiece, I'm at 140x, which does begin to get dim for

guiding. I'll try to keep within the FOV AMAP, good tip. The 140x works out

to be about 5x the focal length in inches with the 130f6, so it looks like I

should use 200+ with the 155f7. May have to upgrade as you say.



For all you ST4 users, isn't the 60mm GS adequate for autoguiding for 155f7?

Eventually I'll have to get one, but I want to experience the pain of manual

guiding for now anyway.



Thanks, Stephen





>A 60mm guidescope can certainly work for manual guiding, though my

preference >has been 80mm. I prefer to select a guidestar that is within the

>field of the image, to minimize the chances of field rotation (good polar

>alignment is important). An 80mm just gives you a brighter selection of

stars, >at a high enough magnification (200X or higher) to make guiding easier.

>

>In any case, a 60mm guidescope is pretty cheap and you can always upgrade

later. >

>

>Bob Luffel



----------------------------

#370 Mar 17, 2000

Even if I buy the 54in pier, maybe you can just buy the center

> section only.



AP said I could buy the 48" pier only (the base, legs, and tension rods are

the same), and a new set of turnbuckles to use with my current tension rods.

Roland said with their 10" Mak-Cass on a 900, the 48" pier was just right.



Gus



----------------------------

#371 Mar 17, 2000

Hi Bobby,

Thats exactly why I bought the guidescope.

Thanks for the response.

Stephen





>I'm speaking a bit out-of-turn here because I don't use guidescopes only

>off-axis guiders; but you should do just fine with the 60mm guidescope. The

>glory of the guidescope is its ability to be tweeked independently of the

>imaging scope. So the smaller apreture shouldn't ever be a problem since

you >will have so much flexability in finding guidestars.

>Bobby Middleton



----------------------------

#372 Mar 17, 2000

Thanks for the info. Gus, looks like the best of both worlds.

Stephen

-----Original Message-----

From: Paul Gustafson drgus@...>

To: ap-gto@egroups.com ap-gto@egroups.com>

Date: Friday, March 17, 2000 2:08 PM

Subject: [ap-gto] Re: 600gto for astrophotography



>> Even if I buy the 54in pier, maybe you can just buy the center

>> section only.

>

>AP said I could buy the 48" pier only (the base, legs, and tension rods are

>the same), and a new set of turnbuckles to use with my current tension

rods. >Roland said with their 10" Mak-Cass on a 900, the 48" pier was just right.

>

>Gus

>

>

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----------------------------

#373 Mar 17, 2000

Sounds like you have it well in hand already.



I use a Celestron (vixen) 80mm f/11 and ST4 with my 155EDF.

At f/11 I generally have had no problem finding suitable guidestars within

the field. I like to have a bright enough star so I can keep the ST4 exposures

at or below 1 second. Assuming that your 60mm guidescope is f/11 it should

work just as well, just at a shorter focal length (but with the 130 f/6 you

will have a similar guidescope/mainscope focal length relationship).



Enjoy the manual guiding! I used to be more of a 'purist' and manually

guided, but I got used to auto guiding surprisingly fast :-) (still, the

set up time and hassles are the same for autoguiding and manual guiding).

What the ST4 really bought me is the ability to do something (like observe)

while taking an exposure. That is what my Traveler gets used a lot for (as

a second scope to use while the 155 is humming away).



Oh yeah, one more thing I learned. Stick with simple guidescope rings, they

work well. I once tried a Tak TGM-2 guidescope stage (basically a teegul

mount). It flexed like crazy and was actually a pain to use (lots of shift

in the axis' when adjusting).





Bob

>

> Hi Bob,

>

> I bought that 60mm GS from AP three years ago for the SDF and 130. With a

> Tak 5mm Guide eyepiece, I'm at 140x, which does begin to get dim for

> guiding. I'll try to keep within the FOV AMAP, good tip. The 140x works out

> to be about 5x the focal length in inches with the 130f6, so it looks like I

> should use 200+ with the 155f7. May have to upgrade as you say.

>

> For all you ST4 users, isn't the 60mm GS adequate for autoguiding for 155f7?

> Eventually I'll have to get one, but I want to experience the pain of manual

> guiding for now anyway.

>

> Thanks, Stephen

>

>

>

> >A 60mm guidescope can certainly work for manual guiding, though my

> preference

> >has been 80mm. I prefer to select a guidestar that is within the

> >field of the image, to minimize the chances of field rotation (good polar

> >alignment is important). An 80mm just gives you a brighter selection of

> stars,

> >at a high enough magnification (200X or higher) to make guiding easier.

> >

> >In any case, a 60mm guidescope is pretty cheap and you can always upgrade

> later.

> >

> >

> >Bob Luffel

>

>

>

>

---------------

> Enjoy 200 FREE Photos including FREE shipping to you, your

> friends & family. Shutterfly delivers beautiful 35mm quality

> prints from your digital camera - ready for frames or photo albums.

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