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Hi! So Ive found some pictures from an arxiv report in a database which I need for my project and converted them to fits files (The picture on the left). The one that was used in the arxiv report (picture on right) is a zoomed in picture of a galaxy in that picture, where its clearly visible. However when I try zooming in on the exakt coordinates of the galaxy in the fits image, its just plain black. I want the picture "raw", that's why I saved it as fits and not their pdf picture from report. Someone suggested first stretching the image for a more detailed image but some filters had to be used though... the only thing I can find on the tables of the images is that filter F160W was used. I have no idea how to move forward now, completely stuck. Would appreciate some help!
By Anonymous Astronomer
I'm looking to buy some NB filters and wanna make the best decision.
1. Does the size of the filter impacts the quality of the image? (is it a big impact?)
2. I know that lower HBW is best, but... for example: does the difference between 35nm and 7nm is worth the price?
3.Can you recommend some H-alpha, OIII, SII?
Thank you in advance!
despite the full moon and the humid weather I could not resist to take some exposures yesterday, merely to test a couple of things, not with the intention to get something decent. I had all sorts of problems, like my ZWO ASI 120MM (mini) not being able to display any stars in PHD2, so I decided to go without guiding, and honestly, as my polar alignment was very good, I was happy with the results of my 1 minute shots.
But having taken a closer look at the subs, I noticed strange diffraction spikes of the bright stars (see attached example).; I'm using a Orion 8 Astrograph and a Canon 500D.
One of the things I modified, I attached a cooling system to the DSLR, bringing it's weight from 480g to 1080g, could that be the problem; I don't remember where, but I seem to have read somewhere that the Orion8 focuser could take up to 1300g. I know I'm close, but still.
Or is it my collimation that is not ok; I admit, I did not check it, as I collimated last week during the day and the whole setup has not been moved. It stays outside under a car cover.
Anybody any idea what's going on here?
Thanks in advance,
By Anthony RS
I'm selling these 2 filters since I'm getting a mono astro cam. The filters are barely used and in perfect condition, no scratches, no fingerprints, not even dust. They are both amazing filters, probably the best investment I've made. I've attached some images
taken with these filters, using a 100$ celestron newtonian, a 250$ Canon 500D and the infamous AVX. Also attached are images of the filters showing their perfect condition.
Astronomik CLS-CCD Canon Clip in Filter: https://www.astronomik.com/en/filter-gegen-lichtverschmtzung-filters-against-lightpollution-lpr/cls-ccd-filter/clip-filter-eos-mit-astronomik-cls-ccd.html
Original price including VAT is 155 Euros (around USD 182). I got it for around USD230 including VAT, shipping and custom taxes.
Selling for USD 100.
Astronomik Ha 12nm Canon Clip in Filter: https://www.astronomik.com/en/clip-filter/clip-filter-canon-aps-c/clip-filter-eos-mit-astronomik-h-alpha-ccd-12nm.html
Original price including VAT 194 Euros (around USD 228). Got it for around USD 270 including VAT, shipping and custom taxes.
Selling for USD 150
I am willing to ship them on my own expense using LibanPost (from Lebanon). Shipping might take time; if you would like to use some other shipment method please contact me to discuss the price.
Feel free to buy one or both together.
Let me know if you have any questions.
You can also contact me on <private email address removed>