VintageBigBlue.org

 

Re: Ovision worm motives (Floyd's log)


Aug 13, 2008

 


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

#38870 Aug 13, 2008

I think that this message just went up before I could type it in.

This is the intended message.



Well people here can comment on what they see in those graphs. I'm

not comfortable rendering judgment. I do see some spikey things that

look like they might not be smooth enough to guide out but I can't

answer if they matter.



So my response is (a) imagers here can answer better than me--they

know what is guide-able and what is not and (b) I bet you Franck will

give you an intelligent response if he sees your results. Send him a

note with the PE to ovision-at-aol.com.



Again it comes down to what your goals are. If you're imaging in a 5"

f/6 you may not need as much as in a 9.25" f/10.



I have a feeling he's not going to oversell you. I don't think this

is a huge moneymaker for him even though others think it's overpriced.

I think he does best on volume sales of stuff that doesn't need

individual certification.



If perchance you did get an Ovision and decided not to keep it I

suspect you could get a healthy chunk of money back on the mart. I'd

guess $300 to $400. So you don't have the whole chunk of change at

risk. You'll get an excel file with a printout and you can put up a

jpeg of that. I think it would sell. But your results look "better

than the average bear."



regards

Greg N



--- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@...> wrote:

>

> I have other logs that are perhaps better, but I thought this was a

> better average log.

> Floyd

> --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> >

> > Sounds like you have to use the Ovision as it comes, no mods. That is

> > OK, as long as it works well.

> > Here is my log from the last test. It shows 2 worm cycles, guiding

> > off, logging on and just polar aligned.

> >

> >

>

tech.ph.groups.yahoo.com/group/Losmandy_users/photos/view/72cf?b=9&m=f&o=0

> >

> > You can see that it is not so far from that of the Ovision and the

> > reason for my hesitant behavior. :^_

> > Floyd

> > --- In Losmandy_users@yahoogroups.com, "gnowellsct" tim71pos@> wrote:

> > >

> > > Floyd I think you should write to Franck and ask him. He's very

> > > forthcoming. Share the answer with us. Greg N

> > >

> > > --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> > > >

> > > > Hi Rainer,

> > > > You have brought up the same concern as I did, why is the

> Ovision set

> > > > up so tight as to be rough and stiff? Just can not figure out

> why this

> > > > would be a good thing.

> > > > I would have to agree that the axial ball bearing sound like a

> better

> > > > idea. So, you think that a person could insert a set of

bearings in

> > > > the Ovision without modification?

> > > > Floyd

> > > > --- In Losmandy_users@yahoogroups.com, "Rainer" rsbfoto@> wrote:

> > > > >

> > > > > Hi Greg,

> > > > >

> > > > >

> > > > > > Rainer

> > > > > > has his own design and is not on board for any of the

> > alternatives,

> > > > >

> > > > > I have been reading this and it has been proven

(astrokattner did

> > > > > exhaustive test in this regard) that working only with

radial ball

> > > > > bearings alone is a risk (76second error)and specially if you

> press

> > > > > them together to tight. OK, there are angular ball bearings but

> > still

> > > > > some problems.

> > > > >

> > > > > I really wonder why the builders of the one piece blocks do not

> > > > > integrate some axial ball bearings into the design. THERE IS

> enough

> > > > > space to put 2 axial ball bearings into it.

> > > > >

> > > > > Both asked me a while ago what do I think about their design

and I

> > > > > told to both that is is very good but they should consider to

> > > > > integrate an axial bearing ... They did not :-)

> > > > >

> > > > > Both already do have the adjustng possibility on the rear end

> of the

> > > > > wormblock. Using a good axial bearing with as much as possible

> balls

> > > > > makes it better. I just changed from an 8 ball to a 10 ball

axial

> > > > > bearing and it improved the running smothness and you really

> do not

> > > > > need to apply high presuure just enough so you feel the wormis

> > running

> > > > > smoothly.

> > > > >

> > > > > I presented the RS-Wormblock I guess more then 2 years ago

and the

> > > > > price was the same as they are selling it now, OK no worm

> > included but

> > > > > with 2 axial bearings.

> > > > >

> > > > > The first good step from Scott Losmandy is to use a brass

worm. I

> > > > > immediately saw a change after using one in one of my mounts.

> > > > >

> > > > > regards Rainer

> > > > >

> > > >

> > >

> >

>







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

#38871 Aug 13, 2008

Floyd,

The log you show has the 76er. The steep dip does not occur at 240sec

intervals, I bet it is the 76er convoluted with the fundamental and

perhaps other harmonics. The PEAS FFT result doesn't look right since

the max frequency occurs at ~170sec and the next biggest at 85sec.

There is usually no strong components (wrt the fundamental) at those

locations. Your tracking would definitely improve with the Ovision

kit, however if your imager focal length is such that the autoguider

can handle 6" swing, no worries... For long focal length imaging the

sudden 2" jumps would be your worst problem. I'm not sure where they

are coming from, I've seen that kind of thing in DEC, but very rarely

in RA.



EB



--- In Losmandy_users@yahoogroups.com, "gnowellsct" tim71pos@...> wrote:

>

> I think that this message just went up before I could type it in.

> This is the intended message.

>

> Well people here can comment on what they see in those graphs. I'm

> not comfortable rendering judgment. I do see some spikey things that

> look like they might not be smooth enough to guide out but I can't

> answer if they matter.

>

> So my response is (a) imagers here can answer better than me--they

> know what is guide-able and what is not and (b) I bet you Franck will

> give you an intelligent response if he sees your results. Send him a

> note with the PE to ovision-at-aol.com.

>

> Again it comes down to what your goals are. If you're imaging in a 5"

> f/6 you may not need as much as in a 9.25" f/10.

>

> I have a feeling he's not going to oversell you. I don't think this

> is a huge moneymaker for him even though others think it's overpriced.

> I think he does best on volume sales of stuff that doesn't need

> individual certification.

>

> If perchance you did get an Ovision and decided not to keep it I

> suspect you could get a healthy chunk of money back on the mart. I'd

> guess $300 to $400. So you don't have the whole chunk of change at

> risk. You'll get an excel file with a printout and you can put up a

> jpeg of that. I think it would sell. But your results look "better

> than the average bear."

>

> regards

> Greg N

>

>

> --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> >

> > I have other logs that are perhaps better, but I thought this was a

> > better average log.

> > Floyd

> > --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> > >

> > > Sounds like you have to use the Ovision as it comes, no mods.

That is

> > > OK, as long as it works well.

> > > Here is my log from the last test. It shows 2 worm cycles, guiding

> > > off, logging on and just polar aligned.

> > >

> > >

> >

>

tech.ph.groups.yahoo.com/group/Losmandy_users/photos/view/72cf?b=9&m=f&o=0

> > >

> > > You can see that it is not so far from that of the Ovision and the

> > > reason for my hesitant behavior. :^_

> > > Floyd



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

#38877 Aug 13, 2008

Hi Greg,

Yes, there are some spikes that I would rather not see. But, as I

said, I have others that are quite flat comparatively, but I did not

post them because they almost look too good.

The one thing that I have noticed when trying to get a log like this

is that focus and conditions play a part in how the graph looks,

because the software reports what the camera posts which includes seeing.

I think you are right about the resale though, it would probably sell

for $350-450 on Amart, it is not something that you would see

everyday, kind of like a Zambuto mirror for sale. If you are in the

market and it is discounted, then you would probably buy it.

Floyd --- In Losmandy_users@yahoogroups.com, "gnowellsct" tim71pos@...> wrote:

>

> I think that this message just went up before I could type it in.

> This is the intended message.

>

> Well people here can comment on what they see in those graphs. I'm

> not comfortable rendering judgment. I do see some spikey things that

> look like they might not be smooth enough to guide out but I can't

> answer if they matter.

>

> So my response is (a) imagers here can answer better than me--they

> know what is guide-able and what is not and (b) I bet you Franck will

> give you an intelligent response if he sees your results. Send him a

> note with the PE to ovision-at-aol.com.

>

> Again it comes down to what your goals are. If you're imaging in a 5"

> f/6 you may not need as much as in a 9.25" f/10.

>

> I have a feeling he's not going to oversell you. I don't think this

> is a huge moneymaker for him even though others think it's overpriced.

> I think he does best on volume sales of stuff that doesn't need

> individual certification.

>

> If perchance you did get an Ovision and decided not to keep it I

> suspect you could get a healthy chunk of money back on the mart. I'd

> guess $300 to $400. So you don't have the whole chunk of change at

> risk. You'll get an excel file with a printout and you can put up a

> jpeg of that. I think it would sell. But your results look "better

> than the average bear."

>

> regards

> Greg N

>

>

> --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> >

> > I have other logs that are perhaps better, but I thought this was a

> > better average log.

> > Floyd

> > --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@> wrote:

> > >

> > > Sounds like you have to use the Ovision as it comes, no mods.

That is

> > > OK, as long as it works well.

> > > Here is my log from the last test. It shows 2 worm cycles, guiding

> > > off, logging on and just polar aligned.

> > >

> > >

> >

>

tech.ph.groups.yahoo.com/group/Losmandy_users/photos/view/72cf?b=9&m=f&o=0

> > >

> > > You can see that it is not so far from that of the Ovision and the

> > > reason for my hesitant behavior. :^_

> > > Floyd

> > > --- In Losmandy_users@yahoogroups.com, "gnowellsct" tim71pos@>

wrote:

> > > >

> > > > Floyd I think you should write to Franck and ask him. He's very

> > > > forthcoming. Share the answer with us. Greg N

> > > >

> > > > --- In Losmandy_users@yahoogroups.com, "Floyd Blue" fblue@>

wrote:

> > > > >

> > > > > Hi Rainer,

> > > > > You have brought up the same concern as I did, why is the

> > Ovision set

> > > > > up so tight as to be rough and stiff? Just can not figure out

> > why this

> > > > > would be a good thing.

> > > > > I would have to agree that the axial ball bearing sound like a

> > better

> > > > > idea. So, you think that a person could insert a set of

> bearings in

> > > > > the Ovision without modification?

> > > > > Floyd

> > > > > --- In Losmandy_users@yahoogroups.com, "Rainer" rsbfoto@>

wrote:

> > > > > >

> > > > > > Hi Greg,

> > > > > >

> > > > > >

> > > > > > > Rainer

> > > > > > > has his own design and is not on board for any of the

> > > alternatives,

> > > > > >

> > > > > > I have been reading this and it has been proven

> (astrokattner did

> > > > > > exhaustive test in this regard) that working only with

> radial ball

> > > > > > bearings alone is a risk (76second error)and specially if you

> > press

> > > > > > them together to tight. OK, there are angular ball

bearings but

> > > still

> > > > > > some problems.

> > > > > >

> > > > > > I really wonder why the builders of the one piece blocks

do not

> > > > > > integrate some axial ball bearings into the design. THERE IS

> > enough

> > > > > > space to put 2 axial ball bearings into it.

> > > > > >

> > > > > > Both asked me a while ago what do I think about their design

> and I

> > > > > > told to both that is is very good but they should consider to

> > > > > > integrate an axial bearing ... They did not :-)

> > > > > >

> > > > > > Both already do have the adjustng possibility on the rear end

> > of the

> > > > > > wormblock. Using a good axial bearing with as much as possible

> > balls

> > > > > > makes it better. I just changed from an 8 ball to a 10 ball

> axial

> > > > > > bearing and it improved the running smothness and you really

> > do not

> > > > > > need to apply high presuure just enough so you feel the wormis

> > > running

> > > > > > smoothly.

> > > > > >

> > > > > > I presented the RS-Wormblock I guess more then 2 years ago

> and the

> > > > > > price was the same as they are selling it now, OK no worm

> > > included but

> > > > > > with 2 axial bearings.

> > > > > >

> > > > > > The first good step from Scott Losmandy is to use a brass

> worm. I

> > > > > > immediately saw a change after using one in one of my mounts.

> > > > > >

> > > > > > regards Rainer

> > > > > >

> > > > >

> > > >

> > >

> >

>







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