Sinemetu63

Hi Maurizio, your captures with the C8 are always very good. Apart your personal ability in imaging and processing, It must be a very good sample of C8 I guess.

CS

Paolo

A short animation of the 10-19-22 captures.

All original size 640x480.

CS Paolo

3 hours ago, vlaiv said:

Great image.

You should probably keep barlow within the specs to give you x1.5 as this is over sampled.

Frequency analysis says that you are x1.5 over sampled. From Jupiter disk size - image as is resolves to ~4200mm (or ~3500 if you resized it to 120%), But actual focal length should be ~x1.5 lower than this - or 2800.

By the way - this is first time I've seen someone capture so very close to theoretical limit of resolution.

Theoretical limit of resolution is where F/ratio is x5 pixel size - in this case 3.75um pixel size of ASI385 will be F/18.75 or FL of 2812mm.

Image has data that corresponds to about 2800mm of FL - so you manage to capture all there is really.

 

Hi Vlaiv, thank you and very interesting analisys.

Actually the 3400mm estimate wasn't mine but suggested by another imager who made this calculation on the basis of a previous image of mine shot with the same parameters. 

I bought the 1.5x barlow just to get close to the "ideal" sampling rate of 5x as suggested by many.

Below you can see 2 pictures taken in the days before that were not resized to 120% .

Can you verify the correct focal lenght and judge the image quality?

CS

paolo

Hi Yelsac, thank you.

I'm using a ZWO ASI 385 MC with a 1.5x barlow, although the focal lenght is probably more than the nominal 2700 mm it should be, probably around 3400 mm, so sampling rate should be around 5 pix or 6 pix per arcsec.

The picture had a ROI of 640x480 but was resized to 120%.

Jupiter and Io with shadow transit.

CS

Paolo

Jupiter in the last 2 nights with a variable seeing, good at moments, shot with the Mak 150.

Stacked around 4500 shot at 120-130 fps in both cases.

CS

Paolo

Jupiter in a window of good seeing on 9/13/2022. 

SW Mak 150 @ 2700mm -ZWO ASI 385MC ir-uv cut filter.

5000 frames, 7.6 ms, gain 356, 120 fps, ROI 800x600.

CS

Paolo

PS: Someone is suggesting me that I am probably running at much more than 2700mm, maybe 3400 on the basis of the pixel size of the planet. I'm using a nominal 1.5x barlow but the lenght of the standard skymax 2" visual back might increase the magnification factor of the barlow.🤔

Great capture Maurizio, wish I could take this level of picture with my dissapointing 8" Meade 203 emc ☹️.

CS

Paolo

A little gif animation of this morning captures.

Skymax 150 @2700 mm, ZWO ASI 385MC on Ioptron Gem 28.

Poor to medium seeing.

CS

Paolo

And another one from the 5th, same set-up and frame number.

CS

Paolo

The new Jupiter season has started so I'm posting my first shots with my new set-up (Skymax 150 on Gem28).

Picture taken on the 3rd of august. Mak 150 @ 2700 mm fl - ZWO ASI 385 MC, 1900 frames stacked. 

CS Paolo

41 minutes ago, Victor Boesen said:

Except your result looks a lot better than mine;) Amazing what this small scope can achieve with its small aperture and focal ratio.

I think that the higher crop factor makes the difference, together with being southernmost. 

CS

Paolo

Inspired by Victor's post I decided to try to shoot jupiter with my Evostar 72 as well. So yesterday evening in a rare moment of clear sky I imaged with the 72 ED, a barlow 2X with an extender that probably makes it 2,5X and a ZWO ASI 385 MC that with its small sensor gives a high crop factor. Seeing was mediocre, FPS about 70 (only an old notebook with USB2 available at the moment), some 5000 frames stacked. The result was better than expected, obviously the details are not very fine, but from such a small aperture...Colour correction  of this scope on the other hand seems to be very good.

CS

Paolo

A decent shot on 10/17/21

CS Paolo

Tonight with a slightly better seeing Io shadow transit.

CS Paolo

This last night picture states the worsening seeing condition in autumn.

Mak 127 with 2x barlow, 4500 frames, 118 FPS

CS

Paolo

One week of clouds...so I'll post a jupiter's shot from late august.

Mak 127 with 9mm EP projection, in mediocre seeing.

CS

Paolo

Nice shot! It's 5" and obviously it's ok even if It is a newtonian...

CS

Paolo

A

Hi everybody,

I'm new to this site and I would like to start a topic to compare the imaging results from small scopes like the very common 5"/6" maks and SCs we beginners often use.

I use mainly a SW Mak 127 on an old EQ 3.2 mount (HEQ5 on order) with a ZWO ASI 385MC camera.

To start off I'll post a recent ( and quite noisy) picture of jupiter with Europa shadow transit (9/30/2021)   - Mak 127 with 2x balrlow + UV/IR filter

Seeing was rather poor, planet around 30° above horizon, FPS 118, 2500 frames stacked in AS!3, waveltes in RS6.

CS

Paolo

Nice pictures,  I like the colors in Jupiter in particular.

The comparison between MAK 180 and Sc 9.25 Is very interesting to me as they are the two opponents in a future new scope purchase ( not this year...).

CS

Paolo

I quote Trevor, very nice shots

PS I am Paolo from YouTube