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Tele – Super Tele: 400 mm vs 600 mm

I'm about to get the Nikkor 400mm F / 2.8 VR (not the FL). This is a lens I've always wanted.

I have already planned some tours through Northern Europe and hope to gain some experience with wildlife photography. I plan to use the 400mm f / 2.8 for my D500 (a camera with APS-C sensor size), and maybe I'll get the 1.4x teleconverter. I thought this should be a decent setup for some wildlife shots.

A few weeks ago, I adapted the 70-200 mm to my MFT video camera. At 200mm it gave me a good idea of ​​what 400mm would look like because the MFT has a crop factor of 2.

What I noticed is that 400mm zooms a lot, but not like crazy. A few days ago I was in the store and asked if the 400mm f / 2.8 might not have enough range. They told me that most wildlife photographers who use large prime numbers rely on the 600mm 1: 4.

Now please don't tell me not to get 400mm or 600mm. This is not about whether you are not making the right decision. It's just about comparing them. I know the advantages of a smaller and lighter zoom, which is also much more versatile. Let's just talk about the 400 mm versus the 600 mm.

The main advantage of the 400mm would be that it is smaller (and also a little lighter). The 400mm would definitely be packable. I also heard that the 400 mm is optically the best compared to the 600 mm and the 500 mm.

The advantage of the 600mm would of course be its range. But maybe I even have to adjust a teleconverter with 600 mm. I think you can't have enough range for wildlife photography (mostly). I think distance could be the key.

Now you may need to know what I'm going to do with it. I mainly want to photograph birds, owls, squirrels, wolves, elk, deer, reindeer etc. Mainly animals from Northern Europe. I am not going to visit Africa to take pictures of elephants, lions or go to the Arctic to take pictures of polar bears. I would like to record videos a third of the time because I also do a lot of documentaries. For videos I use my MFT camera (I have to adjust the lenses. The adapter has an aperture ring but no electronic contacts – so the FL is not an option because I could not control its aperture on my MFT). The MFT has a crop factor of 2. I think the 600mm could be a bit over the top for the MFT.

What are your suggestions? I think I'm going to choose 400mm because it's just smaller, it has a larger aperture and it's the lens I always wanted to own. The only reason I would choose the 600mm would be that the 400mm is just not long enough and I ended up using a 1.7x or even 2.0x teleconverter the whole time.

php – 400 Bad Request receives AJAX Call with AJAX Call

I try when you click the submit button, submit the Ajax request with some values, calculate those values, and return them.

My problem : When I make a custom Ajax call, I get 400 errors from admin-ajax.php.
Please help me find my mistake or the best way to do it.

Ajax Call – footer.php (subject footer)



// handle the ajax request
 function calculation() {
     $value = $_REQUEST('message_id');

     echo json_encode(array("value" => $value));

     // register the ajax action for authenticated users
     add_action('wp_ajax_calculation', 'calculation');

     // register the ajax action for unauthenticated users
     add_action('wp_ajax_nopriv_calculation', 'calculation');


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How well does the CanoScan Lide 400 Slim digitize 35 mm negatives?

I haven't used this particular scanner, but based on my experience with other flatbed scanners and dedicated film scanners, I would almost certainly be better off using a dedicated film scanner that usually has higher resolution and better negative backlighting than flatbed scanners. Just make sure you get one that you can connect to your computer to control when scanning with an application and that you can save the results in at least 16-bit TIFF instead of before Send to JPEG to convert your computer.

To get the best results, devices are required that are far outside this price range. If possible, have the negatives scanned by a pro lab with very high quality scanning equipment and request that the image be delivered in 16-bit TIFF format and not converted to JPEG.

How did someone try to digitize 35mm negatives with CanoScan Lide 400 Slim? What do you think of the performance as a task?

I am an amateur in the analog photography scene and do not have the resources to "build" an analog laboratory in which I live. However, I want to do some experiments with a developed film that I have at home and then digitize the negative to process the results. The problem now is that this will be an experimental thing and you want to buy a scanner that is good value for money. During this research, I saw this scanner mentioned several times, but when I see the reviews, people mostly buy it to scan documents and so on, and I have concerns. How did someone try 35mm film?

POST request in R (400 BAD request errors)

When trying to create a POST request in R, an error of 400 BAD is displayed. To give a little insight, a DAG must be carried out automatically.
I have this:

url <-"http://xxxxx/api/experimental/dags/fire/dag_runs"
data <-'{"conf":"{\"DLP\":\"test\"}"}'

and first tried some methods found online:

result <- POST("http://xxxxx/api/experimental/dags/fire/dag_runs",add_headers(.headers = c('Cache-Control' = "no-cache","content-type"="application/json")))

Then I tried:

httr::POST("http://xxxxx/api/experimental/dags/fire/dag_runs",add_headers('Cache-Control' = "no-cache"))

And finally:

httr::POST(url = url, data = data, httr::add_headers('Cache-Control' = "no-cache"), httr::content_type("application/json"))

but no luck. I am new to this area, so a thorough explanation would be very welcome 🙂