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Latest Posts
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I have the chance to buy the aforementioned OTA. It's in VGC and a good price compared to new This would be my first excursion into imaging with mirrors and bins and I wondered if this would be a good introduction. The FL is 1500mm and I was thinking of using it at native FL for lunar and with a 2.25 x Baader Hyperion barlow for a shot at the gas bags, probably with either an ASI 178MM or 533MC Pro Mount would be the Vixen SXD2 What say you? Any good or am I likely to be disappointed with the 6" aperture/optics? -
By inFINNity Deck · Posted
So, time for a little test... I took an image of white noise from WikiPedia and made two copies of it: the first one twice the canvas size, but with the original image centred in it on a black background (thus still original sampling), the second by resizing the original image with smart resize in Paint Shop Pro (thus oversampled by a factor of 2). Those three images then were processed in Fiji using the FFTJ plug-in: The top row shows the three images, the bottom row the frequency spectra. At the lower left I made a copy of the left spectrum to indicate two dark regions that can be seen in all three spectra (is the original image truly white noise then?). Adding more canvas causes FFTJ to enlarge the output image and to stretch the frequency response over the canvas (the two dark regions a further apart), as a result of which the whole image is filled with data (and as a bonus we get a central cross due to the black background). Resizing the original image by 200% causes FFTJ to enlarge the output canvas, but the frequency response remains the original size (we can see the two dark regions on their original places). So, indeed oversampling is detected by this method. This leaves us with the question why the greyscale version of my Jupiter image results in such a different response when compared to the green channel, I guess it is due to all the processing steps I did (LRGB combine in WinJupos, saturation in PSP and denoise in Topaz AI). Nicolàs -
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Just short of 8 weeks to the start of the Autumn Star Camp folks. Please get your orders in for the Steak Pies on the Friday Night, just before the camp ends. I need "Numbers" to sort out the order to the butcher. I also need to calculate amount of peas and gravy needed. It would be a shame to screw up !! I do not want to have to either cancel it or tell people they are not included because they did not respond to my posts !! Looking forwards to the camp and meeting up with you all. Stay Safe -
Is this the 'Shorty' ? I'd be interested to know what you think... Best, T
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Scope set up and waiting. Covered up in case of slight prediction for rain up to 9pm, bit hoping by that time its ready to roll <fingers crossed!> 😃· 0 replies
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Time to collimate my C8 SCT with a star test. Always hate this part! Groan!!!!· 1 reply
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I find myself in awe looking at the sky tonight, despite the full moon I think our recent rain has cleaned the atmosphere and the stars seem brighter than ever. Despite the full moon being nearby I think I spotted a mag 4.5 star in my B5 area, not half Bad!· 0 replies
Orion coming back into view now, and it's as stunning as ever a region to just... Stare at.
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Taking a break from looking after the post op Mrs H, I ventured out to take my first blurry video of the ringed planet. Battling with full on moonlight and a sea fret moving in land and across my southern horizon I managed to capture a few blurry clips before the fog won. I am now in bed contemplating tomorrow's editing and video processing fun and games which will have to compete for time with cooking the Sunday lunch, making some scones for tea and 3d printing a cooker for my graddaughter's dolls house. A house- husband's day is long and arduous!· 0 replies
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