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| Chat - Friday, February 6, 2009 | |
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| Tweet Topic Started: Feb 6 2009, 12:48 AM (3,145 Views) | |
| Cricket | Feb 6 2009, 06:16 PM Post #196 |
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GEORGE I will do some research tomorrow on Nesting Eagles in the area here. I insist on driving you to The Flower Show. I don't want anyone accidently hitting your leg on Public Transit. |
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| Cricket | Feb 6 2009, 06:18 PM Post #197 |
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Oh GREAT I sat in gum somewhere and it's all over my slacks. YUK. Talk to you all tomorrow. |
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| ostrich2 | Feb 6 2009, 06:19 PM Post #198 |
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Okay now I just have to figure out what you just said When they're talking about a 4/3 system, what exactly is this a ratio of? I recall the fellow at the camera store mentioning 4/3 when he was showing me the Canon and Nikon cameras, and I got the impression he was referring to the crop factor which the full frame cameras don't have. But it sounds like the 4/3 ratio is different? 4/3 ~= 1.33, which doesn't equal 2, and if a 300mm lens on a Canon or Nikon would translate to 450mm, then that would be a ratio of 1.5. I'm still trying to really get my head around the concept of the crop factor and how having a smaller sensor can actually result in being able to resolve more detail in the subject the way you would if you slapped on a lens with a greater magnification on the end. If I understand correctly, the crop factor arises because you're still using a lens which was designed for a 35mm camera on a DSLR which has a smaller sensor. I thought I also read that there are "digital" lenses which are designed natively for the DSLR (and naturally match the sensor size). Is that correct? I hadn't thought quite as much about low light or action shots, although I suppose both could come into play with bird or other wildlife. All of my red-tail shots have been taken of perching birds (although the limitations of the point & shoot make taking a shot of a bird in flight a virtual impossibility), but I often try to find them at work either in the morning or late afternoon, overcast conditions, etc. I don't know how realistic it is to expect your camera to work miracles when lighting conditions aren't great, but if some lenses perform better in a wider range of conditions, I'm sure that would be a plus for birds, since you don't have control of conditions when you're outside. Another thing I need to understand better I think is the f-value of the lens and what that means for the performance of the lens. |
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| LeicaEagle | Feb 6 2009, 06:55 PM Post #199 |
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The crop factor is really a misnomer. In essence its a way of explainign the angle of view a given lens has in relation to the frame size of the sensor i think. The crop factor of my nikon bodies is 1.5 so the 200mm is like the 300mm lens on a 35mm film body slr which has a frame size of 24x36mm. I personally only look for specs that state something like "a 300mm effective 35mm" This is only because having shot 35mm film for so long I know what a 200mm lens does with a 35mm format and if on the nikon dslr it equates to 300mm lens i know what to expect. AS to your question about digital specific lenses yes the crop factor is irrelevant. To use a line by the old comic flip wilson , with those lenses "what you see is what you get" in terms of the stated focal length. With nikon those lenses are designated DX. I only have one digi specific lens the AF G 18-55mm f3.5/4.5 DX lens. which is exactly the angle of view . My other AFD 35-70mm lens is not a digital lens and therefore with the crop factor it is roughly the same angle of view of a dx 52-105mm lens. This is where it gets confusing for many. Ok as for F number, the lower the number the more light is allowed to pass thru the lens onto the sensor or film. the normal way a lens is described is by the focal length and the maximum apeture . the lower the number the more light the lens can allow thru it onto the sensor. just a basic intro here. the normal angle of view of the human eye is what is captured with a 50mm lens. Hence why they sometimes refer to those as a "normal lens" Most makers have two normal lenses a 50mm F1.8 or a 50mm f1.4. The F1.4 lens is faster and will allow more light through it which is great for low light scenes or where you need a faster shutter speed to stop action with. This number and the speed of the shutter=the exposure again using the 50mm lens. Suppose you are using a 50mm f2.0 lens and take a perfect shot using 1/50oth second at f2 to capture a bird lifting off from a nest. This would be the same result as using 1/250th at f 2.8. the relationship of the amount of light let thru the lens to the time that light is captured on the senstive emulsion or sensor is the same ratio. The advantage of one over the other is the creative factor of we the shooters. in this example, you may be able to stop action easier at 1/500th of a second than you can at 1/250th both exposures are the same in terms of what is captured on the film/sensor only the faster shutter speed yields less blurr from the motion becuase it has stopped the action mid flap of the wings for example. |
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| SoCal Lady | Feb 6 2009, 06:58 PM Post #200 |
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NINA---You did super posting this news earlier today! If you go to home page of IWS Forum and click on the Eagle picture---there is a drop-down --select "to track an Eagle". You will see a map of the wanderings of A46 aka Stephen. |
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| Paula eaglet momster | Feb 6 2009, 07:06 PM Post #201 |
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Can someone post the link to the owl cam w/ 6 eggs? Thanks! George & Cricket - I really hadn't thought about the flower show this year...not sure I can do it this year...too much going on at the moment. |
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| SoCal Lady | Feb 6 2009, 07:06 PM Post #202 |
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NINA ---the above link is what I posted today of the photo of A46 taken by someone on the SBCOBirding Forum---Thanks to you telling us about his sighting and we got to see him too! I am hoping he flies"home" to Santa Cruz, now that he has returned to So.Calif. |
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| adklaurie | Feb 6 2009, 07:07 PM Post #203 |
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Here you go Paula: http://www.starrranch.org/stream_barnowl.shtml |
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| LeicaEagle | Feb 6 2009, 07:09 PM Post #204 |
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I am gonna do one more technical explaination regarding F stops. Hopefully i can make it relatively easy to understand. an f stop is actually a ratio. if you have ever seen the inside of a camera lens you may see blades that open and close leaving a circular area open in the center of the lens element. as you turn the apeture dial from 16 down to 1.8 you will see that circular opening get larger and allowing MORE light to pass thru the lens. That opening is measured in some unit such as mm. just like the focal length of the lens. If you take the size of that opening and divide it into the focal lenghth of the lens you get a ratio. Fractions are ratios if i recall my math classes arent they? so if the opening thru the lens diaphragm (the blades inside the lens that open and close is 25mm and that is inside a 50mm lens you have focal length/opening of lens or 50mm/25mm or F2.0. That is the best way i can explain what an F stop actually is but the key tidbit to remebmer is that the lower the number the more light is allowed to pass through the lens. When somebody says to stop down a lens you are letting less light thru it and therefore going from a low f stop such as 2 to 2.8, 4,5.6,8, 11 or 16. when they say open up to they mean going the other way towards the maximum apeture or diameter of the lens opening that passes the light through it. unlike what logic normally would make one think the maximum apeture is the closest number to 1 on the lens the minimum is the larger number sorry folks i really dont want to confuse anyone so i guess i should say "class dismissed"? |
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| lmorton2001 | Feb 6 2009, 07:12 PM Post #205 |
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Paula, this is the link to the barn owl cam. I have no luck getting it at home, but it comes in great on my computer at work. Good luck! http://www.starrranch.org/stream_barnowl.shtml |
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| sandie | Feb 6 2009, 07:12 PM Post #206 |
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Karen don't hope too hard for that. I'd like to see him here first. Or even better have a female fly over here and join him!!! |
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| SoCal Lady | Feb 6 2009, 07:24 PM Post #207 |
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SANDIE---I hadn't thought about A46 that way---he has another year or so to go by the looks of him --I guess before he finds himself a mate. It would be wonderful for a Channel Island eagle or any eagle pair to settle down in S.B. Ventura area for sure. I think I remember reading in one of Deb's Eaglepedia tutorials ---that male eagles when reached maturity, hunt for a mate and often return to the area of their orginial nest. The theory was that they return to where they remember their original good food source. Again, it was just a theory. |
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| SoCal Lady | Feb 6 2009, 07:27 PM Post #208 |
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Owl Cam Mom is standing up and having a stretch That was quick---she is back down on her eggs again, just in a new position |
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| Paula eaglet momster | Feb 6 2009, 07:28 PM Post #209 |
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Thanks for the barn owl links!
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| LeicaEagle | Feb 6 2009, 07:30 PM Post #210 |
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That is not a problem for me. I have been riding SEPTA everywhere and normally i go when the commuters are already in town. Also, since my connection is at one end of the line at 69th street , one has no problem getting seated. However, i could be persuaded to ride back with you from the pa convention center We could even do lunch at the Reading Terminal Market then too as its right there. Bassetts ice cream sounds good doesnt it?? I have this strange feelign that my leg wont be as annoying the first week in march like it has been for the last year since i broke it. I would have just finished comming out of surgery now this time last year as it was late evening when they finally installed the rod when i broke my thigh earlier that morning. The rod removal i think will be done using an arthroscopic technique so there shouldnt be as much slicing and dicing of the tissue to get the screws out. I would not be surprised if they didnt do that when they inserted the rod since there are only three scars from the surgery. Each of which are only about 1" long. Etiher way we do it it would be great to finally meet another cruzer in real life than just interacting on line/ As it is now 1030 here in the east i am gonna go get some sleep so NYTOL! |
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HERE IS THE LINK FOR A PHOTO OF A46 taken today at UCSB area---He is gorgeous and the photo is fabulous!


4:32 PM Jul 10