Greg replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 month ago

jmh recently wrote:

> I read through [Greg's] posts and am a little more puzzled. I have no diagonals in my setup.

I see...then, no reflections, or an even number of reflections?

> The image parity is negative, but parity or orientation shouldn't matter.

I quite agree. And to re-state, there is no problem I can see with solving or
astrometry.net, which seems to be able to solve no matter the parity or
orientation; and the calculated *positions* are correct.

What I question (only from experiment, not from knowledge of the code),
is the calculation of the correction vector.

> One possibility is that the software makes an assumption of what hemisphere I'm in -
> I'm north, but if the software assumes south, then the difference in vector direction
> makes sense.

I hope a developer can determine what's going on, *if* anything is going on. :-)
My *guess* would be that the calculation of the correction vector *may* be off
under certain circumstances. (?)

Greg

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Greg replied to the topic 'Polar alignment module and CEM60 geometry' in the forum. 1 month ago

fmozza,

I had recent problems with polar alignment, because I am using a diagonal
in front of the camera, which mirrors (horizontally flips) the image.

Are you using an imaging train that has an odd number of reflections?
That would cause a mirror image. I may be off here, but I did not get
a response to my initial entreaties, and my experiments led me to
use the capability of my camera driver to "flip" the image horizontally.

This *seems* to have fixed the problem for me, but your camera may
not have that capability, and I *still* may be incorrect, not having received
input from the developers. Yet, my "fix" seems to work.

See my previous posts on this subject, and weigh in if you like.

Gregory

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Greg replied to the topic 'First time w/ Ekos and Indi (guiding problem)' in the forum. 1 month ago

I have the identical problem with guiding, even with pulse guiding enabled (or disabled).
It worked for me before the 1.7 release.

Gregory

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 2 months ago

As a final entry on this thread, I report that the accommodation
that I mentioned previously (i.e., asking the camera driver to do
a horizontal flip, Control/Flip value == 1) did indeed work correctly
for me, in a test conducted two nights ago, and gave an excellent
polar alignment.

However, not all camera drivers have that option, or have it
presented to the end user as conveniently as is the case for
the ZWQ/ASI driver. So, it would not be amiss for the developers
of Ekos to consider a switch that would change the alignment
calculation ("Invert Rotation Calculation" or some such appellation),
in order to accommodate those users who do not have such an
option with their cameras.

Greg

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 2 months ago

Hello again all,

OK, embarassingly, I think I have to say, "Never mind..." :-)

In the last tab marked "Controls" for the ASI camera I am using,
there is, right there, a value for a parameter called "flip".
All I have to do is remember to set that to 1 when doing polar
alignment -- it was set to zero by default. (1 = horizontal flip)

Problem solved!

Greg

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 2 months ago

Still hoping for some answers if at all possible (being
lazy about examining the code ;-)).

My questions for the developers are: is it possible to ask for the "southern
hemisphere" style rotation even if one is in the northern hemisphere?
Would that solve my problem when using a diagonal? If so, where
would I ask for such a feature? If not, is there something else I can
do to make this work? Or am I wrong altogether? (doesn't appear
so from the experiment).

Another thought is that, if I am at all correct (not a certainty), then
those trying to polar align using a typical SCT would also fail in
this way...

Thanks,

Greg

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Greg replied to the topic 'Problem (?) with lx200ap_experimental driver' in the forum. 2 months ago

Hello again David,

Thanks once again for your thoughts on this.

You wrote:

> Another thing to double/triple check is that your location and time are correct.
> The park positions require converting from ALT/AZ to RA/DEC which requires
> your location (lat,long) and time/timezone to be correct.

Thanks for the warning, I will be certain to check that next time I am out,
although I am reasonably certain these parameters were correct.

Something to note in that regard was that, without changing any parameters
or settings, simply swapping in the re-built (from source) driver file and
re-connecting made things work correctly (or at least, as expected).

Greg

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Greg replied to the topic 'Problem (?) with lx200ap_experimental driver' in the forum. 2 months ago

Hello knro,

You graciously responded:

> You should be using the PPA version here: www.indilib.org/download/ubuntu.html

As far as I know, that is what I am doing. I am using the "stable release",
not the "nightly build". Should I be using the nightly build?

Kind of you to respond, considering I am actually running correctly
with the build from source, so not a particularly pressing issue for
me at the moment -- but it may be for others not equipped to build
from source.

Regards,

Greg

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Greg replied to the topic 'Problem (?) with lx200ap_experimental driver' in the forum. 2 months ago

Hello David,

You kindly wrote:

> You might try the above apt-cache show command on your system and see if it says 1.7.3

Here is the (partial) output from that query:


Package: indi-full
Priority: optional
Section: libs
Installed-Size: 8
Maintainer: Jasem Mutlaq <This email address is being protected from spambots. You need JavaScript enabled to view it.>
Architecture: amd64
Version: 1.7.3~201805252020~ubuntu18.04.1

So, it looks to be Version 1.7.3.

Does the mystery deepen? :-)

Greg

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Greg replied to the topic 'Problem (?) with lx200ap_experimental driver' in the forum. 2 months ago

Hello David,

Thank you very much for responding. Sorry you had to do that
extra work, I will develop that skill and check in future.

I suppose I will just continue with the driver as I have built it,
until the INDI release catches up with the relevant code changes.

With gratitude,

Greg

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 2 months ago

Hello lhoujin,

Thanks for the response. astrometry.net has no problem solving a
mirror-reversed image, so that is not the difficulty. The difficulty
(I imagine) rather is that the rotation used for polar alignment
adjustment is not correct, as it would not be for the southern
hemisphere, unless some modification were made (which is
apparently what was done in this last release).

Orientation is not a problem. Plate solving is not a problem.

I may have to examine what was done for southern hemisphere
accommodation, but I would like the opinion of a developer,
so that I am not chasing this problem the wrong way.

BTW, I am not using a guide scope, but rather I am using an
ONAG (on-axis guider), and aligning right through the main
(albeit small :-)) OTA. The ONAG is essentially a beam-splitting
diagonal.

Greg

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 2 months ago

Hello again,

As an afterthought -- does some expert out there know if there
is a way to request the download to mirror-reverse the image,
*before* it gets to the plate solve/alignment stage? That would
solve the issue neatly.

Greg

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Greg created a new topic ' Problem (?) with lx200ap_experimental driver' in the forum. 2 months ago

Hello,

I am having a problem initializing and un-parking from the
Ref Park 1 position (northern hemisphere, OTA on west side
of mount pointing north). When the mount is given a command
to slew or track, it rotates in the wrong RA direction, as if it
expected the OTA to be on the *east* side of the mount. I am
using a Mach1 equipped with a GTOCP3 at firmware version V2.
I am using the recently released INDI version 1.7.0 on Ubuntu
18.04 on an Intel i7-based machine.

I downloaded the source to examine it and see if I could spot
the problem. In preparation for doing this, I re-built the driver
per instructions with the DEBUG flag defined, and installed the
resulting driver (obviously larger since debug information was
included), just to make sure I could reproduce the problem that
way. Oddly, the problem disappeared, and the mount un-parked
correctly!

I can continue working this way, but the behavior seems odd,
since supposedly the lx200ap_experimental driver was just
re-released, and should reflect the current source code (?).
There is certainly a problem with the current 1.7.0 binary release
code (installed with apt-get).

Greg

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Greg replied to the topic 'Indi drivers crashing after updating & upgrading' in the forum. 2 months ago

Similar experience here, especially w.r.t. the sx_ccd and asi_ccd drivers,
although I did get up and running (after a couple of reboots) by removing
the SX Lodestar as a device from Ekos, and using PHD2, which also uses
the INDI driver (although that could be a red herring).

I am (now) running KStars/INDI versions 2.9.6/1.7.0 on Ubuntu 18.04.
The previous versions did not evidence these problems, as far as I recall.

Also, if anyone can provide a clear and easy way to go back to the
previous versions of KStars/Ekos and INDI (short of re-building from
source), that would help.

Greg

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 2 months ago

Hello again all,

Since the weather cooperated, I conducted the aforementioned experiment
last night.

It is only two trials, but my (otherwise uninformed) conclusion was that I
was indeed correct. Supplying a (horizontally) mirror-reversed image did
not work. When I removed the diagonal, and replaced it with simple
straight-through spacers, the Polar Alignment Assistant seemed to
work as advertised, and multiple passes converged.

This is not a "bug" exactly, but perhaps a request for a new feature.
My questions for the developers are: is it possible to ask for the "southern
hemisphere" style rotation even if one is in the northern hemisphere?
Would that solve my problem when using a diagonal? If so, where
would I ask for such a feature? If not, is there something else I can
do to make this work? Or am I wrong altogether? (doesn't appear
so from the experiment).

Thanks,

Greg

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 3 months ago

Hello again all,

Well, since I don't seem to have a definitive reply from the developers,
I will go ahead and conduct the experiment tonight (weather allowing),
by removing the diagonal and trying the alignment sequence.

I will post the result back here.

Gregory

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Greg replied to the topic 'Question on Polar Alignment Assistant' in the forum. 3 months ago

Thanks for the reply wvreeven. I can understand how change of orientation would not
be significant, but it seems to me that mirror reversal may be, although I don't know
with certainty.

I conducted an experiment where I did a polar alignment in a west-rotating direction,
then attempted an alignment in an east-rotating direction (all of this, of course, with
a mirror-reversed view). They produced different results, i.e., the polar alignment
did not converge.

Greg

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Greg created a new topic ' Question on Polar Alignment Assistant' in the forum. 3 months ago

Hello all,

I see that there were some small changes to the polar alignment assistant
in KStars/Ekos version 2.9.6, particularly in regard to a rotation correction
for users in the southern hemisphere.

I have a quick question. I am in the *northern* hemisphere, but the scope
that I use for polar alignment uses a mirror diagonal, so that the "horizontal"
view is mirror-reversed. Will the polar alignment assistant work correctly
in this situation?

Thanks!

Greg

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