View Full Version here: : First Light STF8300_Canon 50mm Lens
08-08-2012, 10:27 PM
I did have an ST8300, which went defective on me, so I got it changed out for the upgraded STF8300. I have found significant improvements in many areas, especially download speeds and cooling. I did use this lens previously with the ST8300 and had to stop it down to f4 to overcome the off-axis nonsense.
Anyway this image was unguided and consequently stars are a little fatter at the edges, and I can see I have some drift going on which is obviously far more noticeable at this FOV.
Just 15 minutes each RGB.
I am going to have fun with this setup methinks.
08-08-2012, 10:46 PM
what a beautiful photo - well done.
I'll have to try with just a camera lens too.
I'll get a QHY10 tomorrow & I hope to be able to
fit a lens to it as well as use it in my telescope.
09-08-2012, 04:23 PM
That looks like a good combination Martin!
Must get myself a decent 50mm lens.
The drift, bottom right hand corner of the image?
Not sure, I need new glasses.
09-08-2012, 06:39 PM
Thanks for the comments.
A comparison between a 60 sec and a 300 sec image showed added elongation in the stars, which I can only put down to drift.
Plenty of folk on this forum have great experience with all sorts of lenses, so if in doubt, post your question.
I hope to use the STL11K to guide tonight and repeat the exercise.
09-08-2012, 06:43 PM
Great shot Martin. Wonderful colours and deeply saturated. Lovely.
09-08-2012, 07:31 PM
Very nice, Martin! The colours are lovely.
I'll be interested to see how you fare with the bigger sensor. I was out last night testing a Zeiss 100mm Makroplanar and STL11K. The corners look pretty horrible until f/5.6 or so. Makes me appreciate the quality of my FSQ-106ED even more.
09-08-2012, 08:07 PM
Very impressive for such a short exposure Martin.
I've got all the gear to do something similar, but been waiting on a motorised focuser for 8months that has finally shipped... Hopefully I'll get my act together in the next couple of weeks.
09-08-2012, 08:35 PM
Thanks again folks.
I should add that this was manually focussed, and like you David, I have all the kit, just have not set it up.
Rick - I am not going to be using the STL with this lens, just using it to guide.
09-08-2012, 08:53 PM
Sorry, missed that little detail. A STL is a very expensive guide camera :lol:
12-08-2012, 04:34 PM
Great photo Martin.
I love the colours and composition.
Using camera lenses is such an enjoyable way to image.
13-08-2012, 05:14 AM
Wow, and you do this type of shot as a test shot!
That's amazing Martin, stunning image. I want to see more from this combination!
It's now IOTW (http://www.iceinspace.com.au).
13-08-2012, 12:43 PM
What a great shot. Which canon lense did you use, the 1.8, the 1.4 or the 1.2, or is it an older lense with manual aperture? If it is a lense with without manual aperture control, how did you stop it down?
13-08-2012, 06:26 PM
Well thanks very much Mike!
David - its the f1.2 professional lens. In order to stop it down, attach the lens to the camera and set your f stop accordingly in the camera.
Press the depth of field button while removing the lens from the camera, and the aperture stays closed....attach to ccd camera!
14-08-2012, 07:27 PM
Wow Martin! Love it!
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