October 25, 2014, 01:33:40 AM

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Messages - Jackson_Bill

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106
Lenses / Re: How many radioactive lenses do you own?
« on: February 04, 2014, 03:40:06 PM »
You all realize that bananas, potatoes, and even beer is radioactive due to the presence of the naturally occurring K-40 (potassium 40) isotope, right?

 8) Yeah, but that's one of those semi-stable isotopes with exceptionally long half-lives. K-40 has a half life of 1.25 billion years! The dose in a banana is about 0.1┬ÁSv, or 0.0000001Sv. For the average human, radiation doses under 100mSv (0.1Sv) per year have no measurable health effects. You would need to eat one million and one bananas in a year to experience the most minimally measurable health effect due to potassium-40 radiation exposure. (I actually don't think that is humanly possible, to eat that many bananas.)

All true, Jon, although another way of putting it is that the Nuclear Regulatory Commission limit on dose to the public (above background) is 1 mSV, which, I agree, is still a lot of bananas :-).
My point was that we are exposed to many sources of radiation, natural and man-made, every day. The implication (in some posts) that Fukushima caused some measurable increase in the dose from lenses manufactured in Japan is bogus. Discussion of radioactive lenses isn't really meaningful unless you consider the associated dose, which is likely to be very small, if measurable at all.

107
Lenses / Re: How many radioactive lenses do you own?
« on: February 04, 2014, 12:43:42 PM »
You all realize that bananas, potatoes, and even beer is radioactive due to the presence of the naturally occurring K-40 (potassium 40) isotope, right?

108
Animal Kingdom / Re: Show your Bird Portraits
« on: February 01, 2014, 01:55:26 PM »
and also speaking of red(ish) birds, I'm trying to decide if these are Cassin's or purple finches - any thoughts? (These were taken in WY in the spring)

109
EOS Bodies / Re: The Next DSLR Will Be Entry Level [CR3]
« on: January 17, 2014, 09:50:38 AM »

...

Seriously, anytime you feel like hauling out the "but Canon sells more!" argument ask yourself if Budweiser really is the best beer in America.

Good one!

110
Canon General / Re: Canon outperforms Japanese peers in patents, again
« on: January 15, 2014, 09:34:00 AM »
But they don't innovate.  Ummmm, yeah, right.   ::)

When engineers get paid for patents, you get lots of patents.
The proof of the pudding is in the eating - I'm still waiting for a 7D replacement or megapixel FF.

111
Lenses / Re: Why can't there be IS/OS in all lenses?
« on: January 08, 2014, 09:49:37 AM »
I must be missing something - why not put the IS in the camera instead of putting it in each of the lenses?

112
Animal Kingdom / Re: Show your Bird Portraits
« on: December 25, 2013, 08:25:57 PM »
On this first day of Christmas
Serendipidy gives to you...
5 ducks a swimming (sorry, I couldn't find 7 swans :D)

Merry Christmas and a Happy New Year to all. :)

a partridge in a pear tree...
maybe a grouse in a pine tree?

113
Animal Kingdom / Re: Show your Bird Portraits
« on: December 25, 2013, 07:42:28 PM »

On this first day of Christmas
Serendipidy gives to you...
5 ducks a swimming (sorry, I couldn't find 7 swans :D)

How about these?

114
Animal Kingdom / Re: Show your Bird Portraits
« on: December 25, 2013, 07:31:51 PM »
How about fish for Xmas dinner?
Common merganser

115
Software & Accessories / Re: How many cards?
« on: December 20, 2013, 11:12:22 AM »
I always have (at least) one more card than the camera has slots.  That way, you keep the files on the card as a backup, until your HDD is also backed up (in at least two places, preferably).  Now that I have a 1D X, I write RAW to both cards, and I've got two or more copies of each image from the moment of capture.

+1

with my 7D, I find my 16GB cards to be too small. When shooting wildlife, more often than not I'm switching one out in the middle of something.

116
Lenses / Re: Another strike against UV filters
« on: December 18, 2013, 02:52:47 AM »
...the filter broke due to the force of the fall,

That kind of force can also damage internal components that you can't see.  You may want to send the lens in to be checked, or at least test it very thoroughly yourself.

Sad but true. I had a similar accident - filter on the front of a 70-200 f2.8 onto frozen ground. The filter protected the front element but the internal adjustment was off.

117
EOS Bodies - For Stills / Re: Canon EOS 7D Firmware 2.0.5 Now Available
« on: December 11, 2013, 09:40:15 AM »
I must admit, not something I ever even thought of using.

118
EOS Bodies / Re: New EOS-1 in 2014 [CR1]
« on: November 20, 2013, 09:27:58 AM »
Like I said before. Canon's "Answer" to the Nikon D800 (and future D900, and the Sony A7R) will come as a big bulky elephant sized 1D-body, with a price tag that most people can't touch.

Ok, then...but what are Nikon and Sony's "Answers" to the 5DIII, which has outsold the D800 and will vastly outsell the a7R?   ::)

Why do people think Canon needs to play Nikon's game?  The D800 was Nikon's attempt to play the game by Canon's rules (we'll see your 8-9 MP increase, and raise you by another 14 MP), and Nikon lost.

I think the numbers argument (BTW, do you have the quantities sold for the D800 and the 5Diii?) is somewhat specious. There are many other considerations than just mp count. I, for one, would have jumped to the D800 if 1) Nikon lenses were as good as Canon and 2) I hadn't had alot (to me) of money tied up in Canon lenses.

Also, I don't think that the high megapixel camera is simply Nikon's game. There are some of us out here that think that a high mp full frame have advantages over the 20 mp variety in terms of cropping or larger prints, AS LONG AS the higher iso performance is reasonable.

119
EOS Bodies / Re: New EOS-1 in 2014 [CR1]
« on: November 20, 2013, 09:12:02 AM »
The 1D X marked its 25th month and I am sorely looking forward to its replacement next year.

25 months? How do you think us 7D owners feel?
:-)

120
Lenses / Re: Handheld vs. tripod with the Great Whites
« on: November 14, 2013, 10:08:29 AM »

I am still working on a solution to strap the lens to the shoulder straps of the bandoleer, so it can hang in a stable position while I operate another body.


In another thread some time back Neuro mentioned using a Blackrapid Sport Left strap to carry a 600mm f/4L IS II with a 1D X.
For short distances and one camera/lens, this sounds like a good approach although I have yet to try it myself. With the monopod, though, it would involve several operations: release the monopod, store it somewhere, attach the 600 to the BR strap, and then get your other camera.

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