Haggish

Hi guys,

Ole got my lightframes and found that the stars were only slightly oval, but enough to make the stars moved thru the  27 frames and he made this.

Thanks.

Ok.

I'll check when I'm home but I think the movement is larger then half a star and I can't see trails even at the dim stars

-Geir

Hi,

yes you understood correctly, but how can it move in the 5 sec between frames and not in the 5 min during exposures !!!

-Geir

1 hour ago, Xplode said:

This sounds like a classic problem with flex.

I guess you'r guidescope is an ST80, these are known to have a lot of flex in them like they come from the facory, there's also some mirror flop in your LX200R scope and both these problems cause streaking stars.

I'll also mention that your setup is not ideal, your DSLR is not suited to the scope at all since you are way oversampled at 0.49 arcsec/pixel, this with an older noisy camera is a setup that is hard to get good results out of without a lot of trouble.

Hi Ole,

Thanks for replying

If you read my post again you will see that my stars is " were round and fine throughout the image ". so I dont thing flex is the problem nor mirror flop (the LX200r has mirrorlock)

That's why this is a great mystery too me

due to the eos 450d is one of the DSRL that is the best due to noise

see link. http://dslrmodifications.com/DSLRcomparison.html

-Geir

PS Ole Bare for og presentere meg på Norsk, Jeg er den Geir som solgte dere 16" som dere har i observatoriet deres på Hågar ;-

Hi guys,
My name is Geir and I'm from Norway I'm new to this forum.
My observatory equipment are: Telescope meade 14 " lx200R OTA @ f:6.2. Mount EQ8 Camera eos450d without IR filter, but with LPS filter.
Guiding: Telescope: Skywatcher 400mm refractor Camera DSI II.
I use phd2 to guiding and EQmod for telescope control.
So my problem. Here one evening I took 20 exposures a 5min of NGC7331 with guiding within +/- 1 "and the stars were round and fine throughout the image, but when I check the frames I see that all the stars move significantly towards the west in the image.
How can this be possible?