Shorthand for: In My Opinion

f/stop is literally a mathematical formula representing the focal length of the lens, divided by the physical diameter of the aperture. So, the value f or focal length is divided (/) by the value of the ‘stop’ or aperture.

Depth of field calculations uses the physical diameter measure of the aperture, and the focal length, as well as the distance.

If you know any two of focal length, aperture diameter, or f/stop, you can calculate the third— so depth of field calculations can be made either from aperture diameter or f/stop, with an added step for converting between these values if necessary. You still need to know the focal length.

As I understand it, the broadcast uses copies of the original.

When I toured WGN radio in Chicago in 2002 they were swapping tape cartridges. I imagine now they use solid state cards, or just haul up the digital files from a hard drive.

But to get the tape or digital copies off of vinyl originals they need to occasionally use a turntable. Or farm that out to some service.

On your return, try I-80. Or on your way out.

I think the I-80 route is more scenic. It parallels the Platte river and runs by more parks and historic sites.

Google maps says it is cheaper (no tolls) and 43 minutes faster than I-70.

If I’m on I-80, I always try to plan my trips so I get to Walcott Iowa for fuel and a meal at the worlds largest truck stop, immediately north of the Walcott exit.

A few hours east of there, in Illinois, it takes you to Starved Rock State Park, which has very approachable rock features, and lots of great landscape opportunities. Level hiking trails. An hour later you are in Pontiac.

I-70 is flat, boring, and I think it was planned that way. It roughly parallels US40, called The National Road, the second transcontinental highway, which goes through the middle of lots of interesting small towns. Get off I-70 and explore by US40 if you can. IMO I-70 was built at a time when people wanted a high-speed bypass to avoid towns.

I-55 between St.Louis and Pontiac parallels the original Rt 66. There have been a lot of travel books written about Rt 66, finding detailed info on that stretch should be easy.

St. Louis is an old town with historic areas. If you like shooting in graveyards, they have some very old, and interesting ones.

Enjoy your trip. Be careful of traffic, and your speed, around St. Louis. There are a few areas with confusing signage. It is easy to miss your exit to I-55.

I’ve had a Canon Selphy 1300 for a couple of years, and bought the Selphy 1500 last year for my son, right after Costco closed down their photofinishing. Cost per print is about 30 to 33 cents. Every thing is for 4x6 prints. You can borderless or use white or black borders.

Thermal transfer (dye sublimation) printing with 4 passes in about 50 seconds a print. Canon says they expect a 100 year life from these prints.

B&H. Amazon, WalMart and others have the machines and supplies. About $115 to $140.

Refills are sold in a package that contains paper and the ink film, in matching quantities. I buy a box for 108 prints, which has 3 ribbon cartridges good for exactly 36 prints each, and 6 packs of 18 sheets of the 4x7 paper. The extra inch (it provides a grip for the machine to move the paper) you can remove easily. Its perforated.

Connections by wifi, and bluetooth, so printing from iPhone app is easy.

I haven’t tried direct printing from the wifi in my camera, but I know I can link camera and phone. So, worst case, I would take that extra step and transfer pic from camera to phone. then transfer photos from the phone to the printer. That also gives me the chance to crop using the phone’s software.

Both units can take a battery pack so you can use this mobile. It isn’t as small as a polaroid, but I can take it to a party and have prints to share in about a minute.

Watching the paper come out of the machine 4 times as it lays down the different color layers is mesmerizing.

Obviously the camera is not adding pieces of glass into the light path to do this. It is simply sampling the receptors in the middle of the sensor, and using them for the jpeg image. You should see smaller file sizes for these, unless the in-camera software is making up something to fill in.

You should get similar results by cropping in Photoshop. You can also get this software to fill in between the dots, and have a few choices on how it determines those.

Bbb

Since you have the 600, why not get a high quality 1.4x converter? The combination will be a bit more than 800 mm, and you’ll lose just 1 stop.

It should be about the same price as a 2x converter alone.

You’ll save the cost of buying a 400 mm lens, which would lose 2 stops with the 2x converter.

My last attempt with having old color film processed had bittersweet results. I’m not sure the processing was the best it could be. The negatives were quite thin. Using the same lab with fresh film also gave thinner than expected results, so that may have been just bad developing work.

Despite that, they were able to get nice black and white prints from the negatives.

The old memories were worth it.

Let the lab know it is old film. Push processing may help.

May you continue to celebrate such a happy anniversary for many more years to come.

You are corrrect, now.

Information you received earlier was not correct. In most SLRs the raised mirror blocked light from the viewfinder and covering the eyepiece was not necessary. The exceptions were in cases of photography through microscopes or telescopes where the light path was split by a stationary prism, or pellicle, like the Canon Pellix, rather than a moving mirror.

With digital cameras the sensor area is dark. With digital SLRs the mirror covers any possible light from an optical viewfinder. With mirrorless cameras there are simply one, two, or more screens displaying the image, and only displaying it. Nothing is fed back to the sensor. electronic

Good points. The conclusion, though, is that AP and Reuters don’t consider one or more Royals to be ‘trusted sources’.

While this is obviously a manipulated print, I’m rather surprised by the strong measures taken by these news services. Their archives contain thousands or photos from the 1950s and before which had to be ‘touched up’ before photoengravings could be made. Knocking out backgrounds was common.

And what about all the retouched/airbrushed images from Hollywood PR departments? I think the number of ‘straight’ shots of movie stars is eclipsed by the mountain of ‘adjusted’ ones.

Notice too, that *all* the stories about this handout ran the picture along with the news that it wasn’t to be used. So much for following directions.

I think the picture is fine as long as there is mention that it has been worked on. They could have cited the source and called it an illustration or representation, and not a news photo. They do this all the time.

After the photo was distributed by the wire services questions arose about its integrity. AP and Reuters then sent out messages on the same channels to not use the photo.

If going light is your prime consideration, just take the 24-105 and a few memory cards.

Forget about switching to APS-C mode. You can crop later on and achieve the same results, effectively using the same patch of pixels.

I like to pack a very small electronic flash. I have an old one that runs on two AA batteries. It could fit in a shirt pocket, but I have a Wein Safe Sync hot shoe adapter on it, and that makes it too big for my shirt. It is useful for fill flash in strong sunlight as well as shots in very dark areas.

On this planet it is hard to be far from a car or truck that doesn’t have a huge battery. Gas or diesel powered, or electric cars. They all have 12 volt circuits.

Car adapters are equally plentiful. Usually they involve plugging into a cigarette-lighter-style outlet. Others allow you to connect directly to battery terminals.

If you only have a wall charger for camera or computer, you can get a small inverter which converts 12 volts DC power from a car (Or truck) to 120 Volts AC. Connect this and just plug in your existing charger. You can find small inverters that pump out about 100 watts for under $30.