Xplode

Very good Herra, much better than i've seen others get with a DSLR. I have access to a Lunt 60mm so i should test that with my 6D too

I've been very happy just using my mono 6D so i forgot to check this thread lately I thought i'd share some results from the camera... This is a single 120s @ iso 1600 frame from my mono 6D, flatfielded (with wrong flats) and stretched a little. Sensor temp was around +10C Scope is a 12" f/3.8 newtonian. It's the full uncropped frame so feel free to download and examine. 90x of those frames...dithered, no darks and old flats that didn't remove dustmotes. Older RGB data with an 8" newtonian and 6Da. Combined they look like this... With some further processing by Göran Nilsson it ended up like this. Pretty good results from what some CCD guys would call a "crappy noisy DSLR"

Great image Herra! I'm doing my first real test of my monochrome 6D just now, 10min on the heart nebula with 7nm Ha filter with my 100Q. It's a little to warm so pics have more noise than i would have liked...not sure how it will end up after 2-3 hours imaging time.

Narrowband and Luminance is what it will be used for. I have thought about sending it off to CentralDS in South Korea to get cooling on it, but not sure if it's worth it as it's pretty cold in Norway anyway during astronomy season.

Not a DIY job, but it's still a debayered DSLR so i hope i won't get thrown out of this thread Last year i had an idea about buying a 6D and get it debayered, around new year there were a special offer for the Canon 6D (N) (N means without wifi and GPS) with a price of 20% under the regular model and on top of that a drawing board that was worth a good amount. The special offer made the camera cheap compared to a regular one so i decided to go ahead and buy one to get it modified. The drawing board was sold for ~20% of the cost of the camera. I sent the camera off to Brent Oliver (Hypercams and Mods) in the US that has debayered Canon cameras with great success. Unfortunately the conversion took a very long time because he recently had a baby (and he also has a kid from before) and there was also some problems with Baader filters that weren't perfect (they had streaks that he couldn't remove by cleaning) so it took almost 7 months from i sent the camera to i got it back, today i finally got it! This is probably the worlds first 6Dm (monochrome) Brend did a very good job and autofocus works perfectly and there's very little left on the edges so it can be used for regular photography perfectly fine. I have made some testshots and picked the best one that was of my cat sitting outside. I opened in RAWTherapee and saved without debayering. Resized to 25% and not cropped. RAW file on Dropbox

A low profile M48 isn't possible for Nikon because of the smaller flange, it seems to be barely large enough for a low profile M42 at 44mm throat. Canon has 54mm throat. You are correct that a Nikon won't fit an OAG at all with with a 55mm backfocus. Canon would work with a TS slim OAG, but a Nikon allows 1.5mm less distance between the flange and coma corrector so there is just no space. If you want this to work you should get a Canon camera...they are much more flexible for astronomy and will cause much less frustration

Numbers for newtonians seems weird, for 30% obstruction contrast increases with bigges scoper as you would expect, with 25% obstruction the 250mm has better numbers than the 300mm which seems weird to me

Thanks for sharing the RAW files. They open perfectly in Pixinsight with the option "create RAW bayer CFA image" (dcraw -4 -o 0 -D)

Great. Could you also take a flat and post it as RAW?

I see there is still a bayer pattern in that image with uneven values for the pixels, i wonder how that would be fixed best? I tried to debayer the image and it turns out looking good, but i guess resolution is lost in the debayering process. Is there a way to change the pixels values so they get the correct values so it doesn't have to be debayered? Could DCRAW fix this or do they need to be processed by some new software? 500x500 crop from original image VNG debayered by pixinsight Changed to grayscale (extract luminance seems to give exactly the same result) Could you post the RAW file so i could experiment more?

Guide speed works together with calibration step so 1850ms should work. I did the calculations for your setup at 0.1x speed and calibration step would need to be 9200ms! I guess this is why your earlier settings didn't work. Auto select star should work great, never had a problem with it myself so i suggest you stick to it too. From what i understand hysteresis on DEC should only be used on mounts without backlash...so none of the Skywatcher mounts and most other cheap mounts won't be suitable either.

Firsly you need to check your guide speed. If you use EQMOD with pulseguiding i suggest you set it to 0.5x under "ASCOM pulseguide settings) in eqmod. If you use ST4 you also have an option there to set it to 0.5x. I have tried lower settings, but found calibration to take more time without making guiding more accurate. I calculated your needed calibribration step to 1850ms. I also suggest you change dec algorithm to resist switch. SNR 40-50 seems very high? I usually guide at stars with SNR 7-12