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  1. jrista

    Deep Sky Astrophotography

    Yes, Ha is hydrogen-alpha. I mentioned the full name in my post when I described how it was mapped to green in the SHO blend. SII stands for Sulfur-II, and OIII stands for Oxygen-III, doubly ionized narrow band emissions from gaseous nebula.
  2. jrista

    Deep Sky Astrophotography

    Thanks, Graham! For the acronyms, HOO stands for Hydrogen/Oxygen/Oxygen, or Ha/OIII/OIII. It is a particular kind of narrow band blend that gives a "natural" look from a color standpoint (hydrogen gas to reddish or pinkish, oxygen gas to a blue or cyan.) SHO stands for Sulfer/Hydrogen/Oxygen...
  3. jrista

    Deep Sky Astrophotography

    While I don't use Canon cameras anymore, as I switched to dedicated, cooled, mono astro cameras a while ago, here is something to get this thread going again: HOO-styled blend SHO-styled blend "The Great Wall", part of "North America" nebula in Cygnus. A total of 24 hours of integration...
  4. jrista

    Switched to Sony...

    These days, you want a German equatorial tracking mount, or GEM. You can pick a lower end one up for around $1500...I started with an Orion Atlas myself, but I used my Canon 600mm f/4 L II lens which is relatively large. An Orion Sirius is cheaper, just under a grand, and could handle smaller...
  5. jrista

    Switched to Sony...

    Regarding usage, there is actually a lot of flexibility with it. I use moderately long exposures of 10 minutes with narrow band imaging (narrow band filters cut out all but about (actually less than) 1% of the visible spectrum, which GREATLY reduces the photon flux levels to far below even...
  6. jrista

    Switched to Sony...

    The IMX183 is actually a different sensor than the one used in the RX100. The RX100 uses an Exmor RS sensor, which is actually arguably BETTER than the IMX183 sensor I am using right now. The IMX183 is a machine vision sensor, and it has some amp glow, a kind you would never see in a mirrorless...
  7. jrista

    Switched to Sony...

    Thanks, Don! AP has really consumed my imaging, just about entirely. I am actually trying to get back into some terrestrial photography, as I haven't actually done much of any the last couple of years (some floral and fungal stuff mostly). While I am not a huge fan of Canon sensors, I'm a big...
  8. jrista

    EF 11-24mm L f/4 vs. 16-35mm f/4 L IS vs. 16-35mm f/2.8 L III

    Thanks for the info. Some health issues and costs have sidelined my plans...or at least delayed them. I'll definitely rend the TS-E 24mm II though and see how it is. I definitely understand the value of a tilt/shift lens, especially for landscapes....so it might be the right lens.
  9. jrista

    Switched to Sony...

    Good to see the old vitriol and hate is alive and well here on CR. *sigh* I have been doing astrophotography for years now, and it dominates what I do. I work with quite a few different kinds of cameras, and have processed data from dozens of different kinds of cameras, including DSLRs as well...
  10. jrista

    EF 11-24mm L f/4 vs. 16-35mm f/4 L IS vs. 16-35mm f/2.8 L III

    Sorry, already been there. Wasn't clear enough...I'm looking for real-world examples. I know not too many people have both, but I am finding search engines less than helpful in this particular comparison. Probably because the terms are so similar, and search engines don't seem to properly handle...
  11. jrista

    EF 11-24mm L f/4 vs. 16-35mm f/4 L IS vs. 16-35mm f/2.8 L III

    Does anyone have any images or know of any images comparing the IQ of the 16-35mm f/2.8 L III and 16-35mm f/4 L IS? I've narrowed it down to these two. The latter currently has the edge, pretty significant price difference, but I want the sharpest results I can get. Most of the time, this will...
  12. jrista

    Time for a playful topic! What's in your two lens bag?

    I guess I have two "bags". Nature bag: 100mm f/2.8 L IS Macro & 16-35mm f/2.8 L II (probably soon to be 16-35mm f/4 L IS) Bird & Wildlife bag: 300mm f/2.8 L II (if rented), 600mm f/4 L II (owned)
  13. jrista

    Switched to Sony...

    Just keep talkin. You are making my case for me. ;)
  14. jrista

    Switched to Sony...

    Well, username checks out... *SMH*
  15. jrista

    Canon officially announces the EF 400mm f/2.8L IS III & EF 600mm f/4L IS III. The worlds lightest lenses of their kind

    I think this is rather premature. Canon has just barely introduced their full frame mirrorless line. We still need to see how it stands up against the competition, how it is adopted, who it is adopted by, in what volume, etc. Everyone loves to call the death and doom of EOS and the EF line, but...
  16. jrista

    Switched to Sony...

    *snnnniif!* Ahhh! The scent of psychotic fanboyism. Seems some things really never change... :( I'll tell ya. The best thing I ever did was leave this nutsy forum and just DO photography. With whatever cameras I wished. It's fun having a diversified kit with many brands. You never lack for the...
  17. jrista

    Nikon has advantage of being #2

    This is just more market diversification. And I don't think it is any different than Canon, if they really are working on their own FF mirrorless. It's a new competitive market. Some people just plain and simply do not want a DSLR, and FF mirrorless has been dominated by Sony for a while. Canon...
  18. jrista

    NAS storage advice

    I've been using ReadyNAS for about a decade. I picked one up after several colleagues recommended them after having reliable experiences with ReadyNAS devices for years. I actually have my first ReadyNAS NVX from over 9 years ago, and it is still running with 8TB of space (4x2GB). The thing just...
  19. jrista

    EF 11-24mm L f/4 vs. 16-35mm f/4 L IS vs. 16-35mm f/2.8 L III

    Thanks for the responses, guys. I have ruled out the 11-24mm due to the front element. While I have considered the 17mm TS-E, it has the same problem, not to mention it is extremely pricey for a single focal length. I guess I like the focal range flexibility of the zooms. I usually use 16mm...
  20. jrista

    EF 11-24mm L f/4 vs. 16-35mm f/4 L IS vs. 16-35mm f/2.8 L III

    I'm in the market for a replacement wide angle landscape lens for the 16-35mm f/2.8 L II I currently have. I generally like the focal range, although I don't terribly often seem to use beyond 24mm. The Mark II version of this lens has pretty poor corner performance, and doesn't even really have...