Search found 70 matches

by AllanHall
Tue Jul 29, 2014 8:52 pm
Forum: Astrophotography
Topic: Flat Frames
Replies: 1
Views: 2836

Re: Flat Frames

I use a custom light box for my flats as detailed on page 243. I discuss the number of darks and flats starting on page 92, that flows over to 93 and the start of 94. Basically, start with 20 and go from there. I use +/-5 degrees as my baseline for matching darks to lights with a DSLR. The camera se...
by AllanHall
Sun Jul 27, 2014 8:12 am
Forum: Astronomy / Astrophotography related books
Topic: Equipment Recommendations
Replies: 2
Views: 5179

Re: Equipment Recommendations

I have no direct experience with the Meade 130, however everything I have heard so far has been positive for a scope at it's price point. Williams Optics also makes excellent APOs in that size and price range. Orion now has a 130mm ED APO as well and from what I am hearing it is an excellent scope. ...
by AllanHall
Thu Jul 24, 2014 5:02 pm
Forum: Astronomy / Astrophotography related books
Topic: Centering EP
Replies: 2
Views: 1763

Re: Centering EP

A centering eyepiece is an eyepiece which has some form of cross-hairs in the middle of the field of view, and is usually illuminated. This allows you to exactly center an object in your field of view for alignment. Here is one like I use: http://www.telescope.com/Accessories/Telescope-Eyepieces/Ori...
by AllanHall
Wed Jul 23, 2014 1:02 pm
Forum: Astronomy / Astrophotography related books
Topic: Resolution and autoguider question
Replies: 3
Views: 1902

Re: Resolution and autoguider question

My main scope and guide scope are bolted together so when one moves, the other moves exactly the same amount. The first thing you have to do is find the resolution of both of the scopes, and to do that we need to use the formula: Resolution = (206.265 x PixelSize) / FocalLength For my main scope tha...
by AllanHall
Sun Jul 13, 2014 8:44 pm
Forum: Astronomy / Astrophotography related books
Topic: Announcing Getting Started: Using an Equatorial Telescope Mount
Replies: 1
Views: 3665

Announcing Getting Started: Using an Equatorial Telescope Mount

When helping people who want to start astrophotography with no astronomy experience or equipment it never fails that a large percentage of the questions revolve around the equatorial mount. As I released more books there were little additions to them regarding the EQ mount but no one place that had ...
by AllanHall
Sun Jul 06, 2014 6:44 pm
Forum: Astronomy / Astrophotography related books
Topic: Prime Focus vs Eyepiece Projection
Replies: 5
Views: 5279

Re: Prime Focus vs Eyepiece Projection

https://pixinsight.com/buy/license.html

This will get you started in the purchase process. Or you can request a trial license here:

https://pixinsight.com/trial/index.html

Good luck!

Allan
by AllanHall
Sun Jul 06, 2014 4:58 pm
Forum: Astronomy / Astrophotography related books
Topic: Where did you get that adapter on page 173??
Replies: 3
Views: 2218

Re: Where did you get that adapter on page 173??

It has been over a year ago. You absolutely may contact them, I used:

Pat Knight
ELM Machine Inc.
PO Box 219
Oakhurst, Tx 77359
elmmach@eastex.net
936-377-5001

Allan
by AllanHall
Sun Jul 06, 2014 1:55 pm
Forum: Astronomy / Astrophotography related books
Topic: Prime Focus vs Eyepiece Projection
Replies: 5
Views: 5279

Re: Prime Focus vs Eyepiece Projection

Jeff, Thanks for the purchases! All the images in the book are prime focus, should have mentioned that, thanks for pointing this out. Eyepiece projection with good quality eyepieces should be close to the same exposures, possibly a little longer. That is assuming approximately a 25mm eyepiece or so....
by AllanHall
Sun Jul 06, 2014 1:48 pm
Forum: Astronomy / Astrophotography related books
Topic: Current status of the book Messier Astrophotography Reference
Replies: 8
Views: 6950

Re: Current status of the book Messier Astrophotography Reference

Nikolay, That's horrible! I can't believe the printers didn't see that. Have you contacted Barnes & Noble to see if they will replace it? Let me know. As for a color version, there currently is not one. The reason is because these are "print on demand" books and they are reasonably priced for black ...