Post your K-1 pictures!

**Kerrowdown** · 08-14-2018, 11:48 PM - **5 Likes**

biz-engineer · 08-15-2018, 12:15 AM

Originally posted by jbinpg

@DimC - Sometimes you will not be able to do a Precise Calibration depending on the mineral content of the underlying rocks.

I've figured out that calibration should be done at the place of shooting and with tripod attached, reason is, the tripod head is not made of non-magnetic material that shift the compass after calibration if the calibration is done with camera detached from the tripod.

pixie · 08-15-2018, 12:33 AM

Originally posted by biz-engineer

I've figured out that calibration should be done at the place of shooting and with tripod attached, reason is, the tripod head is not made of non-magnetic material that shift the compass after calibration if the calibration is done with camera detached from the tripod.

Yes compass and iron don't play well together. Correct me if I am wrong, but isn't the GPS-based astrotracer immune to this problem?

**Kerrowdown** · 08-15-2018, 12:41 AM - **1 Like**

dbs · 08-15-2018, 01:08 AM

Walking or is it reading or is it Hmmm.........don;t know

Dave

**Kerrowdown** · 08-15-2018, 01:42 AM

Originally posted by dbs

Walking or is it reading or is it Hmmm.........don't know

Second clue then...

Glaring daggers.

**Kerrowdown** · 08-15-2018, 01:43 AM - **2 Likes**

Is was gonna say photographer... until I saw the Nikon.

**jbinpg** · 08-15-2018, 01:55 AM

@pixie - Unfortunately, the Astrotracer is affected by local magnetic fields:

Astrotracer North calibration - PentaxForums.com

slartibartfast01 · 08-15-2018, 02:15 AM

Originally posted by biz-engineer

I've figured out that calibration should be done at the place of shooting and with tripod attached, reason is, the tripod head is not made of non-magnetic material that shift the compass after calibration if the calibration is done with camera detached from the tripod.

I have often wondered about this but how would you do the calibration on a tripod? Sounds difficult and dangerous.

biz-engineer · 08-15-2018, 02:27 AM - **2 Likes**

Originally posted by pixie

Yes compass and iron don't play well together. Correct me if I am wrong, but isn't the GPS-based astrotracer immune to this problem?

From the GPS, the position of the camera is known, but the orientation of the camera relative to polar star can only be known from getting correct compass information, otherwise the software couldn't know in what X,Y direction the sensor should move to track stars. An error from compass translate in sensor motion that does not completely compensate for the relative motion of stars, and the error gets more visible when the focal length gets longer.

**RobA_Oz** · 08-15-2018, 02:30 AM

@ Kerrowdown
Perhaps she thought you were the one who ripped her jeans.

**Kerrowdown** · 08-15-2018, 02:33 AM

Originally posted by RobA_Oz

Perhaps she thought you were the one who ripped her jeans.

Just what are you suggesting?...

biz-engineer · 08-15-2018, 02:37 AM

Originally posted by slartibartfast01

I have often wondered about this but how would you do the calibration on a tripod? Sounds difficult and dangerous.

I fold the tripod legs, then I rotate the whole thing. Yes, you are right, it is not easy and risky, but that's the only way I found to get exact tracking, I'm able to track up to 4 minutes, after that the white dots start to appear, so I usually do 2 to 4 minutes captures, at ISO 1600 (2 minutes exposure) or ISO 800 (4 minutes), + low shutter speed noise red. (dark frame subtraction).

slartibartfast01 · 08-15-2018, 04:38 AM - **1 Like**

Originally posted by biz-engineer

I fold the tripod legs, then I rotate the whole thing. Yes, you are right, it is not easy and risky, but that's the only way I found to get exact tracking, I'm able to track up to 4 minutes, after that the white dots start to appear, so I usually do 2 to 4 minutes captures, at ISO 1600 (2 minutes exposure) or ISO 800 (4 minutes), + low shutter speed noise red. (dark frame subtraction).

Just tried calibration on my Mefoto Globetrotter with the legs retracted and in some ways it is actually easier than without the tripod. By holding the legs the camera can be moved more smoothly through the motions. This will be my method from now on.

**RobA_Oz** · 08-15-2018, 05:10 AM

Originally posted by Kerrowdown

Just what are you suggesting?...

All in the name of art, I assure you…

08-14-2018, 11:48 PM - 5 Likes	#19141
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,819	Herself

08-15-2018, 12:41 AM - 1 Like	#19144
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,819	Caught In The Act

08-15-2018, 01:43 AM - 2 Likes	#19147
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,819	Just What Does She Think She Looks Like? Is was gonna say photographer... until I saw the Nikon.

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08-15-2018, 12:15 AM	#19142
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,232	Originally posted by jbinpg @DimC - Sometimes you will not be able to do a Precise Calibration depending on the mineral content of the underlying rocks. I've figured out that calibration should be done at the place of shooting and with tripod attached, reason is, the tripod head is not made of non-magnetic material that shift the compass after calibration if the calibration is done with camera detached from the tripod.

08-15-2018, 12:33 AM	#19143
pixie Pentaxian Join Date: Sep 2012 Location: California Photos: Gallery \| Albums Posts: 873	Originally posted by biz-engineer I've figured out that calibration should be done at the place of shooting and with tripod attached, reason is, the tripod head is not made of non-magnetic material that shift the compass after calibration if the calibration is done with camera detached from the tripod. Yes compass and iron don't play well together. Correct me if I am wrong, but isn't the GPS-based astrotracer immune to this problem?

08-15-2018, 01:08 AM	#19145
dbs Pentaxian Join Date: Jun 2010 Location: Clare Valley S A Photos: Albums Posts: 7,563	Walking or is it reading or is it Hmmm.........don;t know Dave

08-15-2018, 01:42 AM	#19146
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,819	Originally posted by dbs Walking or is it reading or is it Hmmm.........don't know Second clue then... Glaring daggers.

08-15-2018, 01:55 AM	#19148
jbinpg Site Supporter Join Date: Mar 2008 Location: Prince George, BC Photos: Gallery \| Albums Posts: 3,546	@pixie - Unfortunately, the Astrotracer is affected by local magnetic fields: Astrotracer North calibration - PentaxForums.com

08-15-2018, 02:15 AM	#19149
slartibartfast01 Pentaxian Join Date: May 2015 Photos: Gallery Posts: 1,931	Originally posted by biz-engineer I've figured out that calibration should be done at the place of shooting and with tripod attached, reason is, the tripod head is not made of non-magnetic material that shift the compass after calibration if the calibration is done with camera detached from the tripod. I have often wondered about this but how would you do the calibration on a tripod? Sounds difficult and dangerous.

08-15-2018, 02:27 AM - 2 Likes	#19150
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,232	Originally posted by pixie Yes compass and iron don't play well together. Correct me if I am wrong, but isn't the GPS-based astrotracer immune to this problem? From the GPS, the position of the camera is known, but the orientation of the camera relative to polar star can only be known from getting correct compass information, otherwise the software couldn't know in what X,Y direction the sensor should move to track stars. An error from compass translate in sensor motion that does not completely compensate for the relative motion of stars, and the error gets more visible when the focal length gets longer.

08-15-2018, 02:30 AM	#19151
RobA_Oz Site Supporter Join Date: Nov 2008 Location: Tasmania, Australia Photos: Gallery Posts: 8,197	@ Kerrowdown Perhaps she thought you were the one who ripped her jeans.

08-15-2018, 02:33 AM	#19152
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,819	Originally posted by RobA_Oz Perhaps she thought you were the one who ripped her jeans. Just what are you suggesting?...

08-15-2018, 02:37 AM	#19153
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,232	Originally posted by slartibartfast01 I have often wondered about this but how would you do the calibration on a tripod? Sounds difficult and dangerous. I fold the tripod legs, then I rotate the whole thing. Yes, you are right, it is not easy and risky, but that's the only way I found to get exact tracking, I'm able to track up to 4 minutes, after that the white dots start to appear, so I usually do 2 to 4 minutes captures, at ISO 1600 (2 minutes exposure) or ISO 800 (4 minutes), + low shutter speed noise red. (dark frame subtraction).

08-15-2018, 04:38 AM - 1 Like	#19154
slartibartfast01 Pentaxian Join Date: May 2015 Photos: Gallery Posts: 1,931	Originally posted by biz-engineer I fold the tripod legs, then I rotate the whole thing. Yes, you are right, it is not easy and risky, but that's the only way I found to get exact tracking, I'm able to track up to 4 minutes, after that the white dots start to appear, so I usually do 2 to 4 minutes captures, at ISO 1600 (2 minutes exposure) or ISO 800 (4 minutes), + low shutter speed noise red. (dark frame subtraction). Just tried calibration on my Mefoto Globetrotter with the legs retracted and in some ways it is actually easier than without the tripod. By holding the legs the camera can be moved more smoothly through the motions. This will be my method from now on.

08-15-2018, 05:10 AM	#19155
RobA_Oz Site Supporter Join Date: Nov 2008 Location: Tasmania, Australia Photos: Gallery Posts: 8,197	Originally posted by Kerrowdown Just what are you suggesting?... All in the name of art, I assure you…