5D first pic

avandonk · #1 26-12-2005, 08:57 AM

This is a ten second exposure 85mm F2.0 ISO 1600 no filters, quickly taken on 26-12-2005 (morning). Filtered with Noiseware to reduce size and colour auto corrected in Photoshop.
Vignetting is more obvious with a full frame. Looks very promising.
I have changed the image as the other is no longer available.
Terry's is much better.
http://www.pbase.com/terrylovejoy/hu..._first_results
Bert

acropolite (Phil) · #2 26-12-2005, 09:53 AM

Looks good Bert, surprising there's that much vignetting from an 85mm lens, but that's a lens issue I guess.

atalas · #3 26-12-2005, 10:10 AM

Bert I had to put my sunnies on !

Itchy · #4 26-12-2005, 10:22 AM

Hi Bert

Great Chrissy Present!

and WOW, Barnard's loop in 10sec!!!

I ran your image through ABE to see what it could do with the vignetting. A little more adjusment in PSCS2 and this is what I got (I also used IP's Halo reduction tool).

I tell you what though, those 12 Mp images stretch the PC's capability to the limit!!!

Cheers

avandonk · #5 26-12-2005, 10:35 AM

Here is a pic of the 20D frame superimposed on 5D. People are finding with full frame even the best L lenses are found wanting. we have all been spoilt by only using the very good inner part of the images with the smaller format sensors.

Bert

avandonk · #6 26-12-2005, 10:42 AM

Itchy thats much better than I could get. I still have a lot to learn about image processing. I have a longer exposure taken with an LPR filter if you want me to email it to you, and see what you can do with it.

Bert

Itchy · #7 26-12-2005, 10:56 AM

Quote:

Originally Posted by avandonk

Itchy thats much better than I could get. I still have a lot to learn about image processing. I have a longer exposure taken with an LPR filter if you want me to email it to you, and see what you can do with it.

Bert

Hi Bert,

No problems. I'm heading out for the day now, but I'll have a go later.

Cheers

CometGuy · #8 26-12-2005, 10:57 AM

Bert,

Very nice, check you PM I just sent you a processed Eta Carinae shot - for 10 seconds amazing!

Terry

avandonk · #9 26-12-2005, 11:40 AM

Cometguy just returned a pic of Carina that he processed. Again 5D with 85mm F1.8 at F2.0 for 10sec ISO 1600 no filters from light polluted Eltham

http://users.bigpond.net.au/avandonk/temp2.jpg

CometGuy · #10 26-12-2005, 01:03 PM

Bert,

This camera is amazing, the sensitivity and noise performance is a lot better than my modded 300D! Anyone, I have posted all this here (including the LPR shot of Orion which I though was lot longer than 82 secs!):

http://www.pbase.com/terrylovejoy/hu..._first_results

Terry

avandonk · #11 26-12-2005, 01:11 PM

I am just as stunned! Thats great processing. I forgot to even turn on the in camera noise reduction. If it is clear tonight will take some pictures with the 300mm F2.8L. Should have metioned they were all taken with the camera on the HEQ5 mount unguided.

Bert

acropolite (Phil) · #12 26-12-2005, 06:33 PM

Bert, I wonder if the vignetting is a result of the angle that the light is reaching the outer part of the sensor. I think I read somewhere that digital sensors work best if the light reaches the sensor at (closest to) right angles and that film was more tolerant in that regard.

Just looked up the article, the problem is minimised in telephoto lenses (at the lens design stage) by lengthening the back focus and apparently lenses designed for DSLR's have longer back focus to allow light to strike the sensor at angles that are closer to perpendicular. If you're interested I could scan the article and PM to you.

avandonk · #13 26-12-2005, 07:01 PM

I sure that could be one factor. But it is a big ask for any lens. Canon tries to overcome this by having a microlens on each sensor element to concentrate the light.

http://web.canon.jp/Imaging/cmos/tec...gathering.html

I suspect even the 300mm F2.8 L will have some vignetting. with astrophotography we are really pushing everything to the limit.

I will have to improve my image processing methods as CometGuy and Itchy are far more knowledgable than me.

Bert

Harlequin · #14 26-12-2005, 07:06 PM

Thanks for sharing the amazing images. =)

Regards

Daniel

Striker (Tony) · #15 26-12-2005, 07:17 PM

Great stuff Bert and Terry,

Tony I cant wait for this DSLR processing course your doing at Lostock....I'm first.

TidaLpHasE · #16 26-12-2005, 07:29 PM

I can't believe the detail from a 10 second shot, that is one awsome sensor.

Look forward to your future image posting Bert

CometGuy · #17 27-12-2005, 11:20 AM

More wonderful pics from Bert overnight posted at:

http://www.pbase.com/terrylovejoy/hu..._first_results

For comparision I have posted a 180 second shot made with my 300D + 50mm lens to compare with Berts 5D + 85mm lens (similiar field of view). To be fair on the 300D

the shot was made at 3x slower optical speed (f3.5 vs f2) and in 26 C ambient versus 12 C (according to BOM records). Its possible I was using the Peltier cooler so equivalent temperature would have then been ~20C. When it is clear again I'll do a 10sec 50mm f2.0 shot of Orion with the 300D to get a better comparision. However, it is clear there have been some major improvements in noise and sensitivity!

Terry

Itchy · #18 28-12-2005, 07:10 AM

Quote:

Originally Posted by CometGuy

More wonderful pics from Bert overnight posted at:

http://www.pbase.com/terrylovejoy/hu..._first_results

For comparision I have posted a 180 second shot made with my 300D + 50mm lens to compare with Berts 5D + 85mm lens (similiar field of view). To be fair on the 300D

the shot was made at 3x slower optical speed (f3.5 vs f2) and in 26 C ambient versus 12 C (according to BOM records). Its possible I was using the Peltier cooler so equivalent temperature would have then been ~20C. When it is clear again I'll do a 10sec 50mm f2.0 shot of Orion with the 300D to get a better comparision. However, it is clear there have been some major improvements in noise and sensitivity!

Terry

Hi Terry

The 5D certainly looks like a keeper! I had a go at processing Bert's 82 sec Orion and had a lot of trouble dealing with the vignetting. I note that your processing of that pic has similar problems. I used ABE to do the job, but it left the image with a large dark ring in the centre (similar to your's but worse). It would appear that the combination of the sensor size and the sensitivity of the chip are accentuating the vignetting of the lens much more than previous models. I would be really keen to see the same shot processed with a flat frame. Bert: any chance?

Cheers

avandonk · #19 28-12-2005, 09:09 AM

Hi Itchy I can email you a flat frame if you want. I am going to send Terry a cd with raw frames. PM me if you want me to mail the raw frames to you as well. I am keen to find out how you both go processing these images as its a whole new ball game.

Bert

avandonk · #20 28-12-2005, 09:44 AM

I do not know how to properly process these images yet.But I do know a bit of what to do with images through a nebula filter.
Here is a picture of the LMC taken with a nebula filter.
5DH 7X60s summed 300mm @ F2.8 ISO 800. This is equivalent to a seven minute exposure.

http://users.bigpond.net.au/avandonk/LMCNEB.jpg

This is why I bought this camera. It can see H alpha better and has very low noise. I am also looking forward to seeing how it performs on larger telescopes at dark sky sites.

Bert