iwols

Thanks guys and what do you measure the humidity with please 

hi all just wondered what level you keep the humidity  at in your obsy,mine is between 50 and 65% but not sure what it should be thanks

Thanks Tony will have to look into the StarXTerminator as ive never used this before,watched literally  hours if not days of pixinsight tutorials but never got totally to grips with pi over the last few years,ive had some good images but mostly luck than actually having the perfect workflow,and i also find my C8 images more challenging to process than my ts optics images.

well Tony that last image is a world apart from mine,thanks,regarding hi level cloud must admit these lights were taken with a 3/4 moon,one last thing, i understand your workflow except register RGB with L.Thanks for your input and time highly appreciated👍

what was your workflow Tony?

thanks akb must admit your attempt is quite a bit better than mine and definately better stars ,regarding focus it was bang on,,its a problem i seem to have with my c8 edge ,hoping the reducer was going to make it better but stars still seem soft,thanks for the image any way appreciated 👍

hi thanks link to original fits thanks 

https://www.dropbox.com/sh/m2c35zd70ifcac9/AACnbNMtQT5IWvfhk7QKAOaaa?dl=0

3 hours ago, rl said:

I would defer to the imaging experts on this one but I don't think that is a bad image considering the aperture and integration time involved. There is quite a lot of structure visible in the nebula. The pulsar is one of two very close faint stars in the middle; they are not quite split. The Crab is quite a small deep-sky object to image well with a small scope. 

Everyone is going to say "get more data" which is statistically true for random noise. But there is a law of diminishing returns that sets in; you have to keep increasing the integration time out of proportion for the same step of improvement. 20 mins is a bit short. A couple of hours on one object is usually feasible in one session for most people leading normal working lives! Technically, the signal/noise ratio is a Poisson distribution if you're interested in the maths. the signal/noise improves as the square root of integration time.

Was it taken on the transparent night with poor seeing last weekend (10th dec?). Good seeing is worth a lot. Mine taken on that occasion with an 8" scope look a bit better but not much, with 2 hours data. Your stars look a bit blobby but that might be down to over-enlargement. Did you use a Bahtinov mask?. If you're guiding with PHD2 you can see the guiding errors and how they compare to normal.

I can't see too many hot pixels so presumably you did a dark frame subtraction. But there is some noise on the left side that might want some sort of gradient correction. 

I think the colour balance is not far from the truth. The colours in the Crab are quite subdued unless you force the saturation in the processing. I use Siril which does colour balance by adjusting the colour ratios to match the spectra of stars in the image. It plate-solves the image and goes to an online catalogue of spectra before tweaking the colours for the best spectral match. Siril will do the gradient correction mentioned above as well. And it's free (but you are at liberty to make a donation!)

There are some real experts on this site ( I am not amongst them!) Hopefully one of them will chip in and give you chapter and verse concerning resolution and pixel size....but I don't think you are far wrong in that respect. 

We could use some more info on how the image was obtained. Guiding, focussing, Seeing, processing et cetera. 

hi thanks,c8 edge 0.7x reducer on a heq5 ,414 ex camera with filter wheel guided,last night with 3/4 moon,processed in pi cheers

hi all just trying pixinsight with a different work flow ,not loads of data( about 20 mins of each lrgb)  ,how would you improve this please,and how do you spread out amount of l against rgb thanks

thanks guys use the rocket blower and now ok

thanks guys thats a big no then👍

Hi just wondered if it was ok to use the compressed air cans for cleaning optics/ccd,i know you can buy rocket cleaners but is compressed air better/ok thanks

Hi can anyone throw light on he circle at the bottom of the image,same on all filters,C8 edge with reducer

6 hours ago, Stefek said:

I have both ZWO and Celestron. Both of them have pros an cons.  ZWO is thin/short and suited more for shorter FLs and systems with short back focus. Celestron is made for long FLs, it is large and rigid, with large prism . To fully benefit from it , a guiding camera with large sensor is required.  I am using it with my Edge HD 800 and was never in situation that there was no suitable stars for guiding.  Tried to use ZWO with Edge HD few times and it did not work every time. 

In short, for long FLs (around 2m and above) an OAG with large prism and sensitive camera with sensor size that matches the size of prism is the safest way to go

thanks my fl is 1422 at the minute which camera are you using to guide

thanks im using an asi290 guidecam

Just wondered if any body had tried both of these,ive got the zwo one at the minute,but have to use it at 5 secs most of the time and even then it loses stars easily, using it with a c8 edge and .7 x reducer,just wondered if the celestron one were much better?

6 hours ago, Stargazer McCabe said:

Yes. That's what I do...

thanks ,so are you using the clicklok?

thanks as always Vlaiv👍

6 minutes ago, Stargazer McCabe said:

Yes. That's what I do...

thanks👍

as the title says ,at the minute i have a clicklok on the back of my c8 if i put a reducer on will the clicklok go straight on the back of my reducer if that makes sense thanks guys

thanks michael

just wondered how these would go together regards sampling 😃 thanks

thanks franklin

hi all is it possible to use the Baader Hyperion Zoom Barlowlens 2.25x on a 600mm scope with a 414 ex ccd,any thoughts /comments please

just wondered what you use yours for?cheers