sorry all ching but i still cant get my eq3 mount setup properly...
pointed to north...switch on motor and the star still drift away... search google about drift alignment , but i have no idea what to do...
any advise?
eq3 mount setup
One needs to have a rough alignment first. And then using drifting to do the fine tuning. I guess in the first stage, rough alignment, is too rough. So the stars drift away very fast. Even in the rough alignment, it should be reasonably close to the right position. In most of the websites about drifting alignment, they start the discussion from the details & principles, which is a bit involving. Ignore those details and focus on "how" only. It can make life easier.
from my windows , i only can see saturn and spica... i cant see polaris.. i did a rough alignment to north... even with compass... then i use android app call skeyes to check the star location... the ra n dec reading is not accurate.. my stars always drift upward to the left... weird.. feel that EQ setup is so hard... cant even take a picture more than 5s at 105mm with dslr.. so sad...
If ur window or location couldn't see the Polaris, it would be difficult. Rough alignment for astrophotography means u can see the Polaris in the polar scope's Polaris circle. It means the error is less than 45 arc mins. Just use compass is not enough.
http://arnholm.org/astro/polar_alignment/index.html
Don't be sad anyway. Every astrophotographer go through all these challenges. Unlike ordinary photography, if u have a camera, u can shot something. But for astrophotography, with instruments, u may still shot nothing.
http://arnholm.org/astro/polar_alignment/index.html
Don't be sad anyway. Every astrophotographer go through all these challenges. Unlike ordinary photography, if u have a camera, u can shot something. But for astrophotography, with instruments, u may still shot nothing.
If you use DSLR to drift align, try this method: http://www.hkastroforum.net/viewtopic.php?t=20047kreyzie 寫:from my windows , i only can see saturn and spica... i cant see polaris.. i did a rough alignment to north... even with compass... then i use android app call skeyes to check the star location... the ra n dec reading is not accurate.. my stars always drift upward to the left... weird.. feel that EQ setup is so hard... cant even take a picture more than 5s at 105mm with dslr.. so sad...
If you find drifting in a East-West direction, the mount/motor is not accurate enough and it cannot be resolved by polar alignment.
BTW, if your photo g.jpg is concerned, it is aberration not tracking error.
today i try to play with the motor and found the motor doesnt turn at all..cuz the gear loose..i fixed it and it turn now....and i remove the DEC axis motor cuz i feel is useless.. the big metal gear always got stuck..since dec doesnt involve with tracking..i rather remove it... will try again when sky is clear
While DEC is not involved in tracking, it is very useful in the fine adjustment of the aim.kreyzie 寫:today i try to play with the motor and found the motor doesnt turn at all..cuz the gear loose..i fixed it and it turn now....and i remove the DEC axis motor cuz i feel is useless.. the big metal gear always got stuck..since dec doesnt involve with tracking..i rather remove it... will try again when sky is clear
I have never tried this but in princple it can work. However, either you make you own optical isolater (relay) board or you need a USB->Guide Port converter.kreyzie 寫:tang sir , i have 1 more question or opinion from you. im going to modify my motorized hand controller for an guide port... and will try to get a low budget guiding cam... is this a good idea for newbie like this ?
You need the DEC motor for better autoguide, so don't remove it.
http://astrocasto.blogspot.hk/2012/02/h ... -your.html
this is the guide i saw from the net.. i will try this before i spend 5000 on astrotrac..
this is the guide i saw from the net.. i will try this before i spend 5000 on astrotrac..
A GPUSB (i.e. USB to guide-port interface) costs $800 (including shipping), a sensitive webcam $400-$600, guidescope and mounting etc, $600-$900. So you determine whether it is worth.kreyzie 寫:http://astrocasto.blogspot.hk/2012/02/h ... -your.html
this is the guide i saw from the net.. i will try this before i spend 5000 on astrotrac..
$800 as if in USD or HKD?
just now i went to taobao to get a bag for my mount and scope , saw the QHY5T at the price 1200RMB , and i almost bought it..because i wanna modify my motor controller with ST4 port and plugin the QHY5T and run it with PHD as guiding.... luckily i didnt...because i dont even have my mount setup completely.. , even a autoguiding wont help...haha
just now i went to taobao to get a bag for my mount and scope , saw the QHY5T at the price 1200RMB , and i almost bought it..because i wanna modify my motor controller with ST4 port and plugin the QHY5T and run it with PHD as guiding.... luckily i didnt...because i dont even have my mount setup completely.. , even a autoguiding wont help...haha
About US$100 or HK$800.kreyzie 寫:$800 as if in USD or HKD?
just now i went to taobao to get a bag for my mount and scope , saw the QHY5T at the price 1200RMB , and i almost bought it..because i wanna modify my motor controller with ST4 port and plugin the QHY5T and run it with PHD as guiding.... luckily i didnt...because i dont even have my mount setup completely.. , even a autoguiding wont help...haha
If you use QHY CMOS products as guide cameras, you do not need to have a GPUSB. There is one on the camera body.
For guiding, it is better to use a monochrome camera (QHY5) than a colour one (QHY5T).
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