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THe opening from the front side of the lens was designed by Nikon that way so that it is easy to change it into a coffee cup or milkshake cup holder i think... 😎🥤

Because often the exposure time is to fast to register the movement , the exposure normally happens after the diaphragm blades have already been "closed" , but with the sticky blades it happens before that point in time, so it depends on the shutter speed wether there is a visible effect largely. it would help to see an example of the shot with the over-exposure with data included ...

This happens often to older lenses which have been / lived in a warm environment ( like in a car parked in direct sunlight or hot climate), when to warm the "grease" sometimes starts to split ( like a curdled milk product) , the liquid part can then move to other parts of the lens. I believe that other greases are used nowadays that are less sensitive to hotter environments, bu there is still the advise in the manuals that states the maximum environmental temperatures to keep the equipment.

MMM No manual focus rangefinder, ..🙄😎

What helps to create the difference is that it looks like the D850 outperforms the (2010) AF-s 85 f/1.4 G in reslolution due to the much smaller foto cites on the sensor , so no matter what picture size you set on the D850 , the "grittiness" seems unavoidable, where the Df's sensor resolution "fit's" better with the 85mm max resolution i think.

Maybe dumb question : Which 85mm F/1.4 version are you using for this comparison ? The "D" version performs different from the "G" version on Digital - High res sensors , has a different max. resolution ......

Another thing to watch is how the light measuring mode is set, if you set it for center or center weighted, thae camera tries to use optimal speed , ISO etc. for the center of what you see in the view finder, if you set it to measure the whole frame, or part of it then it also wants to find an average for the whole fram, so a bit of dark shade at the edge of the frame will influence the whole picture.. I , for me, with a long lens ( tele lens) always choos for center- or center-weighted modes, using a wide lens i use different modes depending on what i want to stand out ..

There is no relation between shutter speed set and the camera being able to focus ... If you have set "Focus Priority" and auto focus, and the camera does not find anything to focus on ( blue sky .. egal surface without any contrast, white sheet or any other situation without any contrast, then it will refuse to take a picture because there is nothing to focus on. If yo have switched autofocus ön"on the camera and öff" on the lens, it wil not focus either.

why would you choose a macro lens (optimized for clode-by) to step away from your subject ( moving away from it) ? Anyway , more "tele"flattens your subject, so it gets less natural ( shorter noses etc. so it is less flattering for your sitters, so i would not advice either of your proposed lenses for portraiture i guess. If you need smoother background / bokeh i would say try something like a 85mm f/1.4 ..

Indeed, but also there is a reason why larger lenses have their own support to mout them on mono- or tripods, and i guess Nikon and other camera makers think that peole who buy those expensive products are not stupid..🤪 ..

True, hence my remark that possibly a camera is not the iseal tool to carry big heavy lenses , but rather the other way around..

Sadly i cannot find a D*50 service manual right now, but here's a D810 version. CHances are that these type of screw's are used in various D8* camera's for the same function are equal among the D8* camera's. In this service manual you can find out if the exchanged screw's have the same type, so that you can judge if you can exchange them without causing other problems. i find it strang that the mount starts "moving" because of 1 screw, while it is fixed with 5 of them, but if i see some people carrying their camera with a heavy lens mounted, by the strap or the camera body itself, i do understand that some of them might come loose or worse.. Anyway here is the D810 service manual parts list.. : Product Details | Nikon D810 Parts List | Nikon | Service Manuals | Learn Camera Repair

Sorry, must be "full metal main body"some of the panels are made from different materials.. her is a "taking apart movie" so tha you can see the main body, and several separate parts.. : t

>>he F-801/N8008s is not made of polycarbonate. It's actually a magnesium alloy. At least the top-plate is.<< Th Nikon F801(s) has/is a full metal body ! I do not want to post other ppl's pictures here, but just ggl for "nikon f801s cutaway" will show you what it looks like..

A d5200 that dropped into a bucket of red paint ? ;):cool:

There is an iOS app called GPS4Camera, which shows your location , shows a barcode with encoded gps location, You use this by taking a pic of the Barcode it shows, and then take pics on your current location ( or the other way arround). You can use the barcode later on on your PC or ,ac to add the location to your pic in your image processing software. Otherwie there are also several GPS modules you can put on top of your camera like Micnova GPS-N Plus Geotag GPS & N1/N3-kabel voor Nikon D3 D3S D3X D4 D750 D700 D300 D2X D2XS D2HS D200 D5000 D5100 D5200 D5300 D3100 D3100 D D310 D313200. D3300 D7100 D7000 D90 D800 D810 DSLR camera's : Amazon.nl: Elektronica

Nah, it does not work like that.. Every drive is"mirrored" immediatly, so your data is not written on 1 single drive, but at least at 2 of them, so that , whenever there a re failure signals, the failing "physical" drive can be "hot swapped"whitout you noticing. Once a new drive is placed in the rack, it gets a copy of the other drive(s) ( depending how larg the whole network is) straight after it has been swapped in. In larer systems data is mirrored on multiple drives so that there are always at least 2 sources available. This technique was already in use in the late 1970's on "Tandem systems" where everything wasalways available in "pairs" or even more copies spread over multiple physical locations so that even a CPU could get swapped without stopping the system ( Tandem Non-Stop technology).

I have worked in IT from 1982 on as a software engineer on verry large systems as wel on middleware and networked PC level platforms, so i think i have seen my fair share of "scary incidents"...:);):cool:

My main concern with cloud storage is that they form a populair target for hackers especially now in with the Russia in Ukraine situation : How cloud services become weapons in Russia-Ukraine cyber conflict | ZDNet

STill have a ROlleiflex Baby 4x4 which also takes a little larger than 4x4 , but also a magazin for my SL66 which takes 4.5x4.5 , so maybe you used to have a Rollei SL66 series or a Rolleiflex Baby ?

challenge is : you donot know when to copy terrabytes of pictures , everytime it becomes more expensive and more time consuming to copy everything while also keeping track of what is on wich disk / devic etc. this becomes especially cumbersome for museum and/or historical collections where modern digital becomes ïnvisible"where slide and film remain vissible [and have their own chalenges..}

The chalenge of digital pictures : There is still no medium that you can trust to hold the picture for over 20 years, old cd's , DvD's, or other disk the plastic either get;s brittle or gets tellow making them hard to read, VHS Tape ==> no equipment to play them gets produced, Harddisk lives in theory forever but in reality average arround 10-15 years when left alone etc. etc. Analog ( film) is also not ideal , colours fade .. Only monochrome film material sometimes seems to live for over a century .....

MMM OK, , there is a good chance that the memry chip where camera information is kept is located on this "exposure board".. Did they mention a "part number" fot the replaced board?

Normally a shuttercount is only reset if the shutter assembly is reset by nikon ...

He also did coluur, but being the zone system a division of shades between absolute black ( zone 0) and absolute ( if possible) white ( zone 10) , in agreement with his friend Frad Archer, this sytem would get to complicated when also needing to iclude absolute red green and blue, never developed it for colour. There is an impresive collection of landscape pictures in colur published though...