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DAVE AMENDALL

First Effort with C11 SCT Herc Globular

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My first efforts with Celestron C11 mounted on an NEQ6 Nikon 5000 DSLR  10 frames 2 darks Registax with final convert to Jpeg

Better than my efforts with the C8 but still along way to go.................Dave1236916825_HerculesGlobular.thumb.jpg.9f6e3097b4b8133964cc47980f39f252.jpg

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Two darks will may increase the noise in your image rather than reduce it. I'd regard 9 as a minimum and 20-plus as reassuring.

How long were your Glob exposures?

Olly

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What you are trying Olly has told me not to go there, so that gives you some idea how tall the order is of taming a C11, though for me is was Meade 12 inch SC, even worse. I have sort of listened to his advice as I have just held off buying a CEM 120, however I don't feel it will stop me having a play.

I would try 1600 iso I did and I got a usable result from 20 seconds on the Meade Fork, I would try to cut to 30secs too and take more exposures, experiment, its fun anyway but to really tame these sort of focal length you need an expensive mount that is very accurate, but I feel you know that anyway.

Alan

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Thanks Alan, Pity about the imaging difficulties with these larger SCTs. The visual experience with them is impressive.I will take your advice and try the higher ISO and shorter exposure times with more frames. Not forgetting the darks....Dave

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Last nights efforts followed the advice and were ISO 1600  at F10  20 exposures at 30 secs each 15 darks with Registax. focusing  is critical on the  C11.............Dave1087277262_DUMBELLjpg.thumb.jpg.bcb19c442aa4daa9c2312dc81dbeda2e.jpg1302209956_RINGNEBULAjpg.thumb.jpg.fd626bfad8508baff09a91923b8b6f13.jpg1142986057_VEILNEBULA.thumb.jpg.d6d3eede4c539e2f435a7332843e5ff4.jpg

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On 13/09/2019 at 12:24, DAVE AMENDALL said:

Celestron C11

That is an amazing achievement. We once tried a c8. Couldnt get anything like.

Cheers and well done.

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6 minutes ago, DAVE AMENDALL said:
7 minutes ago, DAVE AMENDALL said:

floods

 

Thanks. Yeah. Scary: four people lost their lives. We now have rainforest humidity and either high haze or low cloud. Only 3 ap worthy nights in September but hey, we live to tell the tale. Cue mosquitos...

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On 20/09/2019 at 16:25, DAVE AMENDALL said:

Hi Olly 50 seconds each exposure at F10  ISO 800. Maybe I should increase the ISO and reduce the exposure time..Dave

I think your exposures are too short to pull out the fainter details and need to be longer, though this will ask more of the tracking/guiding, of course.

Olly

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Thanks Olly, I will give the longer exposures a try although this does tend to lighten the sky back ground as with the Veil shots. My conditions are semi urban with  a small percentage of light pollution. We have the new  led street lights here in Bingham with the lights of Nottingham about 8 miles to the west..............Dave

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