• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Search results

thxpress_search_the_forum Search Opus
  1. F

    Astroscope + DSLR = Gallery!

    That is the winning strategy. Fortunately wildlife is active at this time. It also helps to check your local Clear Sky chart for good air conditions.
  2. F

    Astroscope + DSLR = Gallery!

    Here is the side by side, both at 100%. Yours is easier to use by far than a 33 lb, 4ft by 10" dob. The raw is also much easier to work with. On the other hand there is no way around the physics. The size of the diffraction blur is a function of the aperture. I picked a 10" after calculating the...
  3. F

    Astroscope + DSLR = Gallery!

    I calculated based on the ration of FLs. Could you please post a 100% crop from that shot? The feathers at the neck have fine lines good for resolution viewing.
  4. F

    Astroscope + DSLR = Gallery!

    Looks good. That would be 3000 pixels at 1200mm or 1/2 the 6000pixels of the D600.
  5. F

    Astroscope + DSLR = Gallery!

    The 1/2 second is based on their 33% secondary. That is how they can spec it as diffraction limited, as well as hiding the variability in the mass produced Chinese mirror. Their mirrors use to be poor, these days you can expect a 1/6 wave, lucky at 1/8th, unlucky at 1/4. I have no doubt the 80...
  6. F

    Astroscope + DSLR = Gallery!

    That is nice light. The colors came out very rich. Not supersaturated artificial looking, that looks good.
  7. F

    Astroscope + DSLR = Gallery!

    A refractor has many benefits. The downside is you will never get this kind of resolution from a refractor. Even the big green Sigma bazooka is an 800 f5.6 for $30,000 or something. This is a $600 scope. With coma corrector $200. Resolution is a function of lens size. This is 254mm, unmodified...
  8. F

    Astroscope + DSLR = Gallery!

    For best focus, you might be right at a foot or two. The odd smearing at the left side of the animal is coma which is standard for these mirrors away from the central axis. I have a coma corrector which I forgot to put in for this shoot.
  9. F

    Astroscope + DSLR = Gallery!

    Somebody else posted a shot of the same hard, the same day, on the weather network. http://www.theweathernetwork.com/photos/view/beautiful-weather/waterton-elk-herd/18998594
  10. F

    Astroscope + DSLR = Gallery!

    I had a look at that particular shot, View NX says the camera recorded 4537 as the temp. We can agree the usefulness of that is debatable. If however we go through a color managed process, then save to a standard gamut, another color calibrated system that sees that gamut should pick up the same...
  11. F

    Astroscope + DSLR = Gallery!

    Temp is a very basic scientific measurement. If it does not mean a specific thing to different software, then the whole color calibration is a sham. I cant buy that. I have a roughly adobe RGB monitor as calibrated with a datacolor spyder.
  12. F

    Astroscope + DSLR = Gallery!

    Nice choice of color, might be a hair green. Mine is a bit pale, JGobiel's is a bit blue. If you look at the time of day, it was well into the golden light.Nikon's viewNX pulled out the temp at about 4444 from these shots. They know their camera output better than 3rd party software. DxO came up...
  13. F

    Astroscope + DSLR = Gallery!

    DxO seems to do the best job with little effort. This is the kind of FL you need for small animals like birds, if you can track them.
  14. F

    Astroscope + DSLR = Gallery!

    Here is a view with a Nikon 85mm lens. Then 100% crop from a 1200 dob. Same spot with the same D600. Discussion: http://www.luminous-landscape.com/forum/index.php?topic=89731.0 There is a lot of FUD around mirror lenses. The biggest problem is the size of it. ;)
  15. F

    Astroscope + DSLR = Gallery!

    1200 dob cropped. http://farm4.staticflickr.com/3693/10585102886_31a417451c_o.jpg
  16. F

    Astroscope + DSLR = Gallery!

    10" dob 1200mm fl I got the scope for all wildlife shots not just birds. I have the range to let the animal feel comfortable. Often they are curious at you in the distance so you get good direct looks. Donuts only show up at small background offsets.
  17. F

    Astroscope + DSLR = Gallery!

    Very nice detail.
  18. F

    Astroscope + DSLR = Gallery!

    Watching the Sunset
  19. F

    Astroscope + DSLR = Gallery!

    Its strange a slightly upgraded dob would be that much more money. This is the Orion website http://www.telescope.com/Telescopes/Dobsonian-Telescopes/Classic-Dobsonians/Orion-SkyQuest-XT8-Classic-Dobsonian-Telescope/pc/1/c/12/sc/13/p/102005.uts?refineByCategoryId=13 Now a mirror upgrade I can...
  20. F

    Astroscope + DSLR = Gallery!

    The color tone looks a bit green, otherwise it looks fine. It could use a crop to portrait.
  21. F

    Astroscope + DSLR = Gallery!

    An 8" dob is $300. My 10" collapsible is $700. They are not more expensive than a refractor. Edit: A 10" has a razor thin focus plane BTW. If you dont use focus live view all your shots are junk.
  22. F

    Astroscope + DSLR = Gallery!

    Its a big pain in the posterior. Take apart, load in car in 2 trips. Remove from car in 2 trips, collimate, check collimation every 1/2 hr as temp changes, take to car in 2 trips. Get it back into the house in 2 trips. On the plus side it gives you long reach, cheap, with no ca. Coma might be a...
  23. F

    Astroscope + DSLR = Gallery!

    Deer with 1200mm dob and Sony A55
  24. F

    Astroscope + DSLR = Gallery!

    2nd that.
  25. F

    Astroscope + DSLR = Gallery!

    No i dont. Click on the pictures, some of them are quite big. The detail is outstanding. eg.
Back
Top