Humble ED80 and Ioptron CEM40 on Tarantula

[diegocolonnello (Diego)]

not so bad for an ED80///



TEST Ioptron CEM40 EC on Tarantula Narrowband

Technical card

Imaging telescope or lens:Saxon ED80

Imaging camera:ZWO ASI1600MM-PRO

Guiding telescope or lens:Saxon ED80

Guiding camera:QHY5L-II

Software:Starkeeper.it VOYAGER

Filters:ZWO GREEN, ZWO BLUE, ZWO RED

Accessory:Roll off Obsy Canon Payne Observatory

Resolution: 4355x3234

Dates:Oct. 30, 2019

Frames:
Astrodon 36 mm Ha 5nm: 25x120" bin 1x1
astrodon 36mm Oiii 5nm: 25x120" bin 1x1
Astrodon 36mm Sii 5nm: 25x180" bin 1x1

Integration: 2.9 hours

Avg. Moon age: 2.57 days

Avg. Moon phase: 7.31%

Astrometry.net job: 3023355

Data source: Backyard

[CalvinKlein (Kelvin)]

That's excellent for an ED80 Diego !

Is it a doublet or triplet ?

I have the Saxon ED127 FCD100 triplet and think its amazing (apart from the focusser)

[diegocolonnello (Diego)]

This is the ed80, doublet like the Skywatcher, with a 2.5 inch focuser from Moonlite

[Slawomir (Suavi)]

I think it is a great image, regardless of the scope but since you took it with a humble ED80 doublet - I would have to git it 5 stars! Great work Diego.

[CalvinKlein (Kelvin)]

Originally Posted by Slawomir

I think it is a great image, regardless of the scope but since you took it with a humble ED80 doublet - I would have to git it 5 stars! Great work Diego.

I guess a doublet would be quite adequate for narrowband imaging where you are more than likely re-focussing for the different filters. I might have to give my very 'eavy, very 'umble 500/102 achromat a go with NB

[The_bluester (Paul)]

How does the CEM40 guide?

[Andy01 (Andy)]

Very nicely done Diego - especially with modest gear!

[Slawomir (Suavi)]

Originally Posted by CalvinKlein

I guess a doublet would be quite adequate for narrowband imaging where you are more than likely re-focussing for the different filters. I might have to give my very 'eavy, very 'umble 500/102 achromat a go with NB

True, but there is still out of band signal leaking through even the best narrowband filters during longer exposures - it was readily visible around brighter stars with my ED doublet and 3nm Astrodons, so I would expect significant halos around brighter stars with achromat even with the best 3nm filters, and sharpness will most likely be also reduced in the extended objects.

[diegocolonnello (Diego)]

Originally Posted by Slawomir

I think it is a great image, regardless of the scope but since you took it with a humble ED80 doublet - I would have to git it 5 stars! Great work Diego.

Thanks mate, i worked harder than usual on the process, but happy with the result...

Originally Posted by CalvinKlein

I guess a doublet would be quite adequate for narrowband imaging where you are more than likely re-focussing for the different filters. I might have to give my very 'eavy, very 'umble 500/102 achromat a go with NB

I refocus every 5 subs, every new filter and ever 2 deg C...

Originally Posted by The_bluester

How does the CEM40 guide?

I am happy to say the encoder on RA is really effective, this little mount has GPS, home sensors, the encoder and nice build quality. guiding was between 0.5 to 1.1 total rms, seeing was all over the place but the end result seems to be usable...

Originally Posted by Andy01

Very nicely done Diego - especially with modest gear!

I guess what matters is to have fun with any equipment.

Originally Posted by Slawomir

True, but there is still out of band signal leaking through even the best narrowband filters during longer exposures - it was readily visible around brighter stars with my ED doublet and 3nm Astrodons, so I would expect significant halos around brighter stars with achromat even with the best 3nm filters, and sharpness will most likely be also reduced in the extended objects.

Hummm i will have to find an acromat refractor to try my hand.... only for science's sake