Paul1956

I have a Star Adventurer with ZWO guide scope 120mm focal length with ZWO 120mm Mono Camera attached to Canon 7Dmk2 hot shoe securely fitted. I Use a Polemaster for perfect polar alignment. My lens is a Tamron 150-600mm telephoto. I use Backyard EOS for image control and PHD2 (latest multi star version). Images are near perfect but my question relates to the Declination graph and Star Mass screen in PHD2. Now I am configuring everything correctly with PHD2 set for RA guiding only Declination disabled. What I am seeing is drift in the Declination axis and want to understand what is actually happening and basically can I just ignore this effect as not having any issue with the end image. The Red Declination line will drift upwards on the screen and eventually disappear leaving only the blue RA tracking line visible (usually tracking +/- 3 arc seconds) and on the star mass green cross lines the guide star drift (usually to the right) over a short period. In the RA axis everything is fine and as I said the end images even at 300 second exposures are perfect. The camera is secure to the declination bracket on the Star Adventurer and balance is great in all 360 degrees positions. Although not worried as such I would appreciate some insight as to what is happening so I can understand. By the way to assist with orientating, my camera is usually fitted to a vertical position, thus on the star mass cross lines RA is Up/Down and Declination is left right...just for ease of interpretation. Thanks Paul