January 26, 2015, 02:07:30 PM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - lol

Pages: [1] 2 3 ... 35
I've always wondered if this is something that could be catered for by the use of battery grips. Yes, it would increase size and bulk, and limit access to the connections. I'm guessing it probably wouldn't be really economic to also sell a native left handed model of everything, so an add on left handed grip might be a workaround.

Landscape / Re: Deep Sky Astrophotography
« on: January 11, 2015, 09:35:21 AM »
Here's my attempt of Lovejoy C/2014 Q2 last night. My Sigma 300 is lent out so I made do with a 150mm macro instead.

Equipment: Canon 7D2, ISO1600, Sigma 150mm f/2.8 macro at f/2.8, Astronomik CLS CCD filter, 161 x 30s exposures. Took more but rejected a load due to cloud. Tracking background stars unguided with lousy polar alignment.

Processing: Starting with PixInsight, flats, star align, comet align, stack, stretch, DBE (I messed up that order, should be done earlier), curves, photoshop.

Above is only the comet aligned stack. I've yet to do a star align stack.

I've tried to optimise viewing for the tail in this image. My local light pollution is rather rubbish.

EOS Bodies - For Video / Re: 1100D video for astro work
« on: December 28, 2014, 08:43:24 AM »
In what way can the moon damage the sensor? Light bouncing off it isn't that different from daylight levels.

EOS Bodies - For Video / Re: 1100D video for astro work
« on: December 27, 2014, 10:29:14 AM »
Note the question was for video imaging, not stills. Also the 450D has had its day. I've used both the 450D and 600D for long exposure astrophotography, and the 600D output is visibly better. Sensor generation trumps pixel size there.

EOS Bodies - For Video / Re: 1100D video for astro work
« on: December 27, 2014, 08:47:33 AM »
I've taken video of the moon with the 600D before. I found the mov format to be a pain since most astro software handles avis. Also the video is lossy compressed. I note the 7D2 now has the mp4 option which is a bit easier to handle, but don't know when they might have added this to other models. Dedicated astro video cams can output raw video so you get better quality stills out of it. I think someone made a picture style before which was flatter and more neutral which could help with later processing.

On that note, with planets, unless you have seriously big optics, they are still tiny on sensor. A bigger sensor is wasted. For example, the camera I was using is "only" 640x480 with similar pixel size to the 18MP APS-C Canon sensor. You can easily fit Jupiter on that with 6m focal length. I was trying between 4m f/20 and 6m f/30 and there isn't much in it quality wise. Yup, could use a bigger scope :) Other planets are going to be smaller! Also with a dedicated astro camera, you can run at higher frame rates to increase your chances of getting good moments.

For a rough idea, below are with the astro imaging cam, not DSLR, but gives an example of what you could expect size wise. They are 100% crops. Left is my first and only serious Mars attempt though 6m f/30, and right is Jupiter at 3m f/30 (I was testing out a new scope at the time). That's with 200mm and 100mm aperture optics. If you can go bigger, there is more resolution potential.

Back to DSLR output, I don't think I ever bothered going through processing the moon video I took with the 600D, but I would say the moon would be a better choice to play with in this case.

Lenses / Re: Any ideas on getting good focus when shooting thru glass pane?
« on: December 23, 2014, 05:47:29 PM »
Is the focus off, or is the image distorted? If the glass isn't perfectly flat, it will lead to distortions which both throws off the focus and also negatively affects the image. Only workaround is to move around and try shooting through a different bit of glass. On that note, keep as perpendicular as you can to the glass. Tilted glass will cause an effect like a prism.

Stopping down can help mitigate those effects to an extent.

Lenses / Re: With a new 100-400L, is the 28-300L Next?
« on: November 29, 2014, 12:41:30 PM »
I would think a 28-300 non-L would be a possible candidate, especially if they want to expand full frame more into the (relatively) affordable mainstream.

Photography Technique / Re: Extreme macro question
« on: November 23, 2014, 05:29:42 AM »
If your lens supports it, you can use a teleconverter. I prefer this over extension tubes as you retain working distance and focus range.

Also it is untrue that extension tubes wont degrade image quality. Well, it may not be noticeable at moderate amounts, but you're pushing the lens out of its designed operating region. For example, if you try this on the 50mm f/1.8 you will find massive field curvature quite quickly. Combined with the quick loss of working distance I'm not a particular fan of this approach, but certainly it is a low cost option.

The MP-E65 does what it is supposed to, but lighting it has always been the biggest problem for me, and that would be an area you would need to put effort into.

If you want serious magnification, you can always buy a microscope with DSLR adapter. These adapters aren't just mechanical, but better ones include corrective optics. With my particular microscope, I get horizontal field of views of about 1.2mm and 0.3mm with 10x and 40x objectives respectively on APS-C sensor. In lens equivalent magnifications, that would be about 19x and >70x! Of course the subjects will be limited here, as you will have near zero working distance and depth of field! I really should get better at focus stacking...

EOS Bodies / Re: Canon 7D II sensor measurement
« on: November 18, 2014, 05:27:11 PM »
That's a new site to me. The obvious question is, do their scores make any more sense than, say, DxOMarks? I had a poke around the site, and the description of the subscores is a bit vague at best. Even DxO explain it better than they do, but the weighting here does seem more rounded.

Lenses / Re: Advice needed on possible 100-400 L Lens Trade
« on: November 15, 2014, 01:40:20 PM »
I'd echo the above, check the zoom action is smooth and doesn't stick/jump. Also look through the viewfinder when doing so. I fear my 100-400L I had since new is wearing out from heavy use, and the zoom isn't smooth any more.

I previously had a used 35-350L which is also pump action, and that suffered even worse. At least I got that from a dealer so I could return it.

What's the "f" number?
Just looked it up. They decided on f/15, giving a focal length of 450m.

I've tried planetary imaging with 4 to 6m focal length optics before with moderate success, as the collimation wasn't right. I have to wonder what sort of images might be possible if they pointed the TMT at closer subjects such as those.

EOS Bodies - For Stills / Re: Is the 7D MK II Really Selling Well?
« on: November 04, 2014, 02:37:10 PM »
Without actual sales numbers we're just guessing.

I tried to look at UK dealers, but most don't have real time stock info so it is hard to tell who has what.

Personally I will buy one, but I'm not buying right away. In the UK, generally new kit sells at MRP/RRP/whatever RP at launch, and drops gradually over time. We don't seem to get instant discounting like other countries. I might bite when it drops 10-20%.

Software & Accessories / Re: DxO OpticsPro 10 released
« on: October 29, 2014, 05:34:48 PM »
Just had a very quick play with 10. Feels snappier than 9 for sure. I guess I'm in for at least this upgrade cycle.

Software & Accessories / Re: DxO OpticsPro 10 released
« on: October 29, 2014, 05:09:11 PM »
I just logged in to my account to check out the upgrade pricing. £55 to go from 9 Elite to 10 Elite, with free ViewPoint 1.2.1. For an extra £25 get ViewPoint 2.5.

Might have to get a demo of 10. I never quite got along with 9 as much as I did with 8 or before so found myself using it less.

Software & Accessories / Re: DxO OpticsPro 10 released
« on: October 29, 2014, 04:56:43 PM »
From the pdf:

All users who upgrade to DxO OpticsPro 10 ELITE Edition are entitled to a free copy of DxO ViewPoint 1.0.

I'm not very familiar with Viewpoint, but would that restore the functionality equivalent to version 9 for no extra cost after all?

Pages: [1] 2 3 ... 35