Astrozoid

Got some colorful stars and quirky star trails after the camera and scope crashed into the pier after tracking the sky from the east side to the west side through the meridian. This happened ...

Hi Bill, Thank you very much! Jerry

Hi Bill, Could you provide a link to the article you refer to in an earlier message?  I don't see a page for the D810a on your web site, I only see a page for the D810. Thanks, Jerry

Get a regular D810 and modify it and save a lot of money. Jerry

Thanks Bill,  Do you mind if I use these numbers in my article with a link to your page? Thanks ,, Jerry

Hi Bill, Thanks for the info...  do you have read noise numbers in electrons for various ISOs on the D810a? Jerry

Hi Keith, I think you understand it pretty well... it's all about the photons collected. If the read nose is the same, then a lower ISO is better, because you will get more dynamic range. There's ...

The problem with the full-spectrum mod is going to be estimating your exposures for the Prominences ahead of time if you plan to automate your sequence capture. Since the camera is more sensitive ...

Hi Chris and Gun and Vishwanath, Thank you for your kids words and for taking a look! Jerry

If you look at my review, I have a daytime example including a Macbeth chart where you can see what it does, and commentary on what you should and should not be using it for. Jerry

Yes, that is correct. Yes, I can. For high-resolution planetary imaging. I have extensively tested it and showed examples in my talk at the NorthEast Astro Imaging Conference. No. You need 1:1 to ...

I’ve expanded my review of the Nikon D810a astrophotographic DSLR camera that originally appeared in the February 2016 issue of Sky & Telescope. http://www.astropix.com/html/i_astrop/eq_tests/Nikon ...

Dark Nebulae B75 and B72 are part of a gigantic complex of dust in Ophiuchus. Click on the link to see a larger version with more information. I shot this incredible area of sky with a Stellarvue ...

Great! I'm looking forward to your articles and how-to videos. Let us know how focus-stacking works also. Jerry

How do you think focus stacking is going to help? The Sun and Moon are both essentially at infinity, so you're not going to have anything at a different focus... perhaps I am misunderstanding what ...

ISO 800.

Thanks for taking a look. Jerry

The Pegasus 1 Galaxy Cluster This image was shot over the course of two years, mostly because of weather and other projects that got in the way. It's a stack of 37 frames with 4 hours 26 minutes ...

If you want to include the sky on a fixed tripod, you can pretty much forget about using the 55-200mm as the stars will trail in very little time. Use the 18-55 wide open at f/3.5. Use the ...

Really nice. Jerry