Pete Presland

Hi welcome to SGL from Pete in Bedfordshire 🙂

Hi welcome to SGL from Pete in Bedfordshire 🙂

Hi welcome to SGL from Pete in Bedfordshire 🙂

Hi welcome to SGL from Pete in Bedfordshire 🙂

Excellent set of images.

Excellent looking disc!

Lovely proms and filaments!

superb set of prom images.

A superb 1st light for your new camera.

Nice capture, good to see a nice size spot. I am sure we see numbers pick up as the year goes on.

A fine set of images.

Nice little spot there!

Nice set of images.

A stunning set of images, especially that prom!!!!!!!!!!!!

A fine looking disc.

Venus in reasonable conditions from the 6.02.2020. Captured with Celestron C9.25, baader UV filter and Asi 290mm camera. Stacked 10% of 25,000 frames Some pleasing cloud visible again.

Very nicely captured Avani, especially at this distance.

Nicely imaged Roger, lovely sharp phase showing there.

Nice images again Luke, I don't think they are much different to what i am getting to be honest. I would not expect super sharp detailed UV images, i think your images have plenty of detail while retaining a very natural appearance. I have posted a response to you question RE difference in exp length, in the thread.

Loving this! How very interesting, especially the different sensitivity of each of the individuals. Thanks for sharing this.

I have been thinking about why your exposure is so different from mine. Looking at the QE graphs for both cameras and reading about it, i think mine might be a little more sensitive at the UV end of the spectrum. I copied this off their website, it mentions a UV-IR blocking filter? ALTAIRGP130M-FULL Package: CS-Mount adapter with built-in Clear Optical Window, AR coatings. (Attached at factory but removable). CS-Mount adapter with built-in UV-IR Blocking Filter, AR coated. (Removable) I also wonder whether your scope has some sort coating on the mirror perhaps, not been able to find any info despite a long look online. Not sure i have helped, but i was interesting reading about the subject anyway.

Some very nice detail visible there. My exposure with my C9.25 and the same filter are around 14ms. This is the Firecapture log details for my latest image. Camera=ZWO ASI290MM Filter=UV Profile=Venus Diameter=15.02" Magnitude=-4.09 FocalLength=8750mm Resolution=0.14" Filename=2020-01-28-1708_2-UV-1.ser Date=280120 Start=170814.156 Mid=171130.160 End=171446.164 Start(UT)=170814.156 Mid(UT)=171130.160 End(UT)=171446.164 Duration=392.008s Date_format=ddMMyy Time_format=HHmmss LT=UT Frames captured=26328 File type=SER Binning=no ROI=640x480 ROI(Offset)=0x0 FPS (avg.)=67 Shutter=14.84ms Gain=425 Brightness=1 WBlue=0 SoftwareGain=10 (off) USBTraffic=60 AutoExposure=off Gamma=50 HighSpeed=off Histogramm(min)=0 Histogramm(max)=196 Histogramm=76% Noise(avg.deviation)=n/a Limit=none Sensor temperature=15.5 °C

Its around 14ms. The image from the 18th was 13.25ms at 3.30 in the afternoon (daylight), the image on the 28th was captured later, but still only 14.84ms.

This particular image was at around 4:50pm, so still light. My best images have nearly all been in daylight, one of them was the middle of summer in the afternoon.

What a beauty!!!