Going back to Sadr

[Whistlin Bob]

Not sure how wide something has to be to be widefield, this is 135mm, so if I'm in the wrong section please move  

I've had an ASI1600mm for a couple of years now, adding Baader UNB filters last year, and was keen to try something different with it, so I've got a ZWO lens adaptor and rigged it up on my HEQ5 with a finder guider. A bit over mounted!:

 

For first light of this rig I attached a Russian made Jupiter 135mm from 1976, that I've had for a few years. Had a nice clear night last Saturday and have been playing with the data since. Here's an SHO version which is 90 minutes per channel, plus half an hour for some RGB stars:

And here's a Starless HaRGB version- which really brings out the texture of the nebulosity:

I have to say I'm completely delighted with this! For comparison, I used the same lens on the same bit of sky on my dear old Canon 600d mounted on a Star Adventurer couple of years ago. I was really pleased with it at the time, but the new setup blows me away!

 

 

 

 

 

 

[davew]

What a neat little set up. 

I think widefield is what you want it to be. Even with a long refractor it's going to be widefield next to a 14" SCT ! My personal thoughts are that if you use a Camera lens then it's widefield.

I like that starless image and wonder what it would look like if you reintroduced the stars from the Ha filter and/or the RGB set. Your stars look rather nice right into the corners.

Dave.