Douglas L wrote:
Not quite an analogy but it sort of illustrates how technologies have changed. I was shooting hummingbirds two weeks ago at a garden, there were 5 or 6 other photographers at the popular spot, when the hummingbirds flew in to hover over the flowers, I could hear rapid firing shutter sound from the their DSLRs like machine guns firing, I was shooting 30 FPS with my Sony A1 in complete silence with the electronic shutter. Sure the DSLRs "sound" more fun!
Since I am posting, may as well post a few shots from Sunday's outing.
Just beautiful Douglas! The Lily Pons Garden is near me and they are beautiful! Just acres of hundreds of varieties!!!
Again sensational images! Especially the "selective coloring" lotus!
Dan
DanNehmer wrote:
Question to the MA2A brain trust.......... specifically those who have worked on / serviced jet engines as I have remembered past conversations to have drifted too.
What is the typical injection pressure fuel is presented to the combustion chamber within the jet engine? Asking because i was asked to review a technical paper on jet fuel atomization and the paper is working in pressures of 1500 bar (21,700 psi) and that really seems more diesel injection pressures. I typically work with systems that are in the 2,000 to 2,500 bar (29,000 to 36,000 psi). My understanding of jet's is limited but since the fuel flow is continuous in nature and that requires a constant flow hydraulic pump I would have expected operating pressures to be 400 bar/6000psi or less.
Any comments or guidance that can be shared would be appreciated!
Thanks,
Dan...Show more →
This is for the LEAP NEO engines on the Airbus:
3.1. Fuel Pressure:
Minimum: 345 hPa (differential pressure)
Maximum: 4137 hPa (differential pressure)
When the engine is running, the fuel pressure at the engine pump inlet must be kept 345 hPa
above the true vapour pressure of the fuel with a zero vapour/liquid ratio under normal operating
conditions.
That is 5-60 PSID.
My reading of the vapor pressure of JET-A at normal temps is less than 1 PSI.
I had assignments all over the metroplex today so I took some time in between to fiddle with the Canon 800/F11 RF. Tough day to shoot 800mm due to the heat, but it did a pretty good job. I shot with it, then the Canon 200-400, just to see how much difference there is..............besides the $12,000...........
Obviously there is a difference, but the 800mm/F11 is a pretty darn good lens for the money, Don is right. The AF hunts around a bit and is not nearly as crisp as my 200-400, or my 800mm big white, but I expected that. I don't have a knot in my lower right back muscles either. The lens doesn't weigh as much as a full Coke bottle and it's very easy to shoot with. Depending upon what you are shooting, I would guess that one's keeper rate would be lower with the 800/11 and if you are a pixel peeper you'll see a slight difference in sharpness. All in all, for 900 bucks, it's a great lens to have in the arsenal.
This is a mix between the 800RF and my 200-400......................
800mm Jim!!!! Darn we had howitzer shells that big in SE Asia!!!!! Well maybe NOT that big! Germans had them on railway cars though in WWII!!!
Images look darn sharp and crisp to me!
RD
I think the lens is worth having, I’ve paid more for a couple of B+W filters, it’s a great price. As you know, I’m a bit spoiled when it comes to optics, and I demand a lot from my lenses, so it’s not a lens I’d buy. I was going through 5400 images from the air show Chandler and I shot yesterday afternoon and evening and it made me realize how incredibly important it is to my work to have cutting edge equipment. Really, it’s the difference between, “that’s a cool shot”, and “Holy Cow!” I’m always aim for the latter.
I am very aware that it’s not practical, or in many cases feasible, for photographers to spend the kind of money a 600/800 prime costs, and these lenses are certainly a great way to extend reach, without hocking the kids.
We drove to east Texas yesterday in pouring rain and bumper to bumper holiday traffic. The whole time I was thinking that it was an exercise in futility. Lesson learned, again, we ended up with one of the most beautiful skies I have ever seen, and the event was a wonderful success. More to come, I have to go see a lady about a B25 🤣🇺🇸👍🏻
I think the lens is worth having, I’ve paid more for a couple of B+W filters, it’s a great price. As you know, I’m a bit spoiled when it comes to optics, and I demand a lot from my lenses, so it’s not a lens I’d buy. I was going through 5400 images from the air show Chandler and I shot yesterday afternoon and evening and it made me realize how incredibly important it is to my work to have cutting edge equipment. Really, it’s the difference between, “that’s a cool shot”, and “Holy Cow!” I’m always aim for the latter.
I am very aware that it’s not practical, or in many cases feasible, for photographers to spend the kind of money a 600/800 prime costs, and these lenses are certainly a great way to extend reach, without hocking the kids.
We drove to east Texas yesterday in pouring rain and bumper to bumper holiday traffic. The whole time I was thinking that it was an exercise in futility. Lesson learned, again, we ended up with one of the most beautiful skies I have ever seen, and the event was a wonderful success. More to come, I have to go see a lady about a B25 🤣🇺🇸👍🏻...Show more →
Great advice Jim! Yes the lens is really the more important of the composition for me! I am spoiled also. If you can justify having the lens, then a "no brainer"!
I try to make the best with what I have! I haven't been real disappointed. East Texas looks horrible weather wise. Just be safe, careful and patient....much of which I loose more each day!
RD
Happy Independence Day! My fellow American patriots!
The second picture was me celebrating my first Independence Day at my sponsor's home less than two months after arriving in this fine country from communist China in 1990. 31 years later, I have gained a lot (weight) and lost a lot (hair). But I treasure the freedom we STILL have here.
Just rolled in the driveway after shooting two air shows in East Texas. The Tyler "Rose City Airfest" yesterday afternoon/evening, and "Thunder Over Cedar Creek" this evening. Thunder is held, literally, over Cedar Creek Lake just outside of Gun Barrel City..................Good Lord I love Texas! I've got early church in the am, a quick shoot at DFW right after and then I'll start digging into the 12,000+ images from the past two days.
Thank you Jim! That’s a lot of files to cull! Look forward to seeing your fine work. I am going to shoot the DC fireworks tonight, the weather will be great but the crowds will be bad.
JWilsonphoto wrote:
Thunder is held, literally, over Cedar Creek Lake just outside of Gun Barrel City..................Good Lord I love Texas!
Happy 4th Y'All!
I wonder how many Texas creeks are named "Cedar Creek"? There is a creek named Cedar Creek running through my property here in Central Texas. I am familiar with Gun Barrel City. Use to drive across the lake at Seven Points to Gun Barrel City on the drive to visit my Dad in downtown Mabank. While it may sound like a "hick" town, there are some huge, beautiful homes on the lake as you drive on the Parkway across the lake and then you reach the Walmart.
JWilsonphoto wrote:
Thank you Douglas, right back at Ya Buddy! Folks like you are what makes this country what it is and I, for one, appreciate you more than I can say!
I 2nd that emotion also Jim and Douglas! Welcome Brother!
Dan
. Sure the DSLRs "sound" more fun!
