PorscheDoc

PorscheDoc

Lives in United States City, United States
Works as a Doctor
Joined on Sep 3, 2010

Comments

Total: 69, showing: 1 – 20
« First‹ Previous1234Next ›Last »
On article Gear of the Year 2016 - Barney's choice: Nikon D500 (217 comments in total)
In reply to:

Mister Joseph: Can the Sigma 18-35/1.8 AF motor keep up with this D500 AF beast?

It cannot keep up even with a static subject except in the center (maybe after calibration). Forget about using any off-center AF points (see response below and links),

Link | Posted on Dec 19, 2016 at 20:40 UTC
On article Gear of the Year 2016 - Barney's choice: Nikon D500 (217 comments in total)
In reply to:

CheddarMonkey: Tempting camera indeed. But what lenses should one get? One could use FF lenses for wildlife, but there don't seem to be great DX lenses for wide/everyday focal lengths (where ff lenses would be at a disadvantage). Anyone else struggling with this?

@paulski66: the problem with the Sigma 18-35mm Art is that is cannot focus accurately except at the center AF points. The Sigma dock only calibrates the center AF point. Accurate AF requires liveview, but who uses that for fast action work? It is a shame as this lens would have been ideal with the D500.
References:
https://www.dpreview.com/forums/post/57909267
http://nikongear.net/revival/index.php/topic,3754.0.html
http://www.pentaxforums.com/articles/review-news/sigma-18-35mm-autofocus-a-second-look.html

Link | Posted on Dec 19, 2016 at 18:02 UTC
In reply to:

rfsIII: I feel bad for the car dealers in Seattle; judging from the galleries, no one has bought a new car up there since 1975. It's like Havana except with Volvos and Volkswagen instead of Fords and Chevies.

There is a picture of a mid-1980's Toyota MR2.

Link | Posted on Dec 9, 2016 at 16:47 UTC
In reply to:

rugosa: No pretty ladies or cute cat shots ? How am I supposed to judge the quality of this camera ?

There is a dog picture and one cat at #30.

Link | Posted on Dec 9, 2016 at 16:43 UTC
On article Lensrentals tears down the Nikon 105mm F1.4 (157 comments in total)
In reply to:

Favorable Exponynt: So there are gears. They implied it was a ring type, so they lied. Gears can break. Especially plastic ones. Somebody should have them examined to determine whether the lens has a built in technical life span.

At least the AF motor assembly is securely anchored, unlike the Sony "Zeiss" FE 55mm f/1.8. The Zony AF and focus-by-wire motor is just glued to a flat surface and prone to failure (Cicala's 'Linear EM Type 1' motor; see https://www.lensrentals.com/blog/2016/04/a-look-at-electromagnetic-focusing/ ). Once the blob of glue fails, the lens is unusable and cannot, or will not be repaired by Sony's outsourced repair centers.

Link | Posted on Dec 3, 2016 at 19:45 UTC
On article Lensrentals tears down the Nikon 105mm F1.4 (157 comments in total)
In reply to:

nicolaiecostel: Looks like a toy and is made in China and they charge a whole lot of money for it, 2527 USD in my country. And what's with that focus motor and gears, it looks as if they employed a crack team of engineers from Toys R us to design this thing.

Doesn't look good for Nikon if that's what they call top of the line nowadays.

@nicolaiecostel
The comparison to the 85mm Otus is the third fiqure down (https://www.lensrentals.com/blog/2016/11/nikon-105mm-f1-4-e-mtf-bench-tests/ ). The Otus is better in the center and a little better in the corners than the Nikkor. However, the Otus is 2x the price and is manual focus only.

Link | Posted on Dec 3, 2016 at 19:31 UTC
On article DPReview Asks: What was your first camera? (766 comments in total)

Nikon F with 50mm f/1.4 lens while in high school. Had to work weekends as dish washer and busboy at $1/hour to get the cash ($400). Later bought Leica M4 with 50mm 'cron at Navy PX ($300). Still have and use both cameras and lenses.

Link | Posted on Nov 6, 2016 at 18:46 UTC as 112th comment
In reply to:

Under The Sun: Yikes. Table Tennis rubber? Yikes that material is going to absorb tons of dirt, dead skin cells, and gunk from the user's hand rather quickly.

You are assuming that these will be used. I think they will only be touched by gloved hands when they are not on display behind glass.

Link | Posted on Oct 13, 2016 at 06:53 UTC
On article Striding Forth: Canon EOS 5D Mark IV Review (2128 comments in total)
In reply to:

PorscheDoc: Why limit the shot buffer to only 17 raw (https://www.usa.canon.com/internet/portal/us/home/explore/see-legendary/comparison )? At this price point I expected a larger buffer.

"17 shots or more" of the largest files is still much less than 79 shots. The 5ds has a burst rate of 12 or 14. The latter "more rate" is with a UDMA 7 CF card. This "more rate" is still pitiful considering the state-of-art $3.5K DSLR. It would have been easy for Canon not to cripple the 5d4 with a tiny buffer.

Link | Posted on Aug 26, 2016 at 01:24 UTC
On article Striding Forth: Canon EOS 5D Mark IV Review (2128 comments in total)
In reply to:

PorscheDoc: Why limit the shot buffer to only 17 raw (https://www.usa.canon.com/internet/portal/us/home/explore/see-legendary/comparison )? At this price point I expected a larger buffer.

The buffer for 5ds is 12 raw files at 60.5 MB each or 726 MB total (page 151 of 5ds user manual). The D500 buffer is 79 raw files (14-bit uncompressed) at 43.1 MB each or 3405 MB total (page 387 of D500 user manual). The buffer of the D500 is 4.7X that of the 5ds.
If the file sizes of the 5d4 are similar to that of the 5ds, there is no excuse for the small 17 burst size of a supposedly state-of-art camera.

Link | Posted on Aug 25, 2016 at 23:24 UTC
On article Striding Forth: Canon EOS 5D Mark IV Review (2128 comments in total)
In reply to:

PorscheDoc: Why limit the shot buffer to only 17 raw (https://www.usa.canon.com/internet/portal/us/home/explore/see-legendary/comparison )? At this price point I expected a larger buffer.

I think you're correct-another example of deliberately crippling one model to prevent cannibalization of a more expensive one.

Link | Posted on Aug 25, 2016 at 18:32 UTC
On article Striding Forth: Canon EOS 5D Mark IV Review (2128 comments in total)
In reply to:

PorscheDoc: Why limit the shot buffer to only 17 raw (https://www.usa.canon.com/internet/portal/us/home/explore/see-legendary/comparison )? At this price point I expected a larger buffer.

Why? A Cfast card would allow faster buffer clearance, but a larger buffer could still have been installed in the 5D4. The D500 has 200 raw ( 12-bit) or 79 raw (14-bit) buffer using either SD or Xqd cards.

Link | Posted on Aug 25, 2016 at 18:05 UTC
On article Striding Forth: Canon EOS 5D Mark IV Review (2128 comments in total)

Why limit the shot buffer to only 17 raw (https://www.usa.canon.com/internet/portal/us/home/explore/see-legendary/comparison )? At this price point I expected a larger buffer.

Link | Posted on Aug 25, 2016 at 17:46 UTC as 364th comment | 9 replies
On article Striding Forth: Canon EOS 5D Mark IV Review (2128 comments in total)
In reply to:

Funkyd3121: So, the Canon G7XII gets a Digic 7 processor & the New 5DIV gets Digic 6+ - Huh??

Why limit the shot buffer to only 17 raw (https://www.usa.canon.com/internet/portal/us/home/explore/see-legendary/comparison )? At this price point I expected a bigger buffer.

Link | Posted on Aug 25, 2016 at 17:45 UTC
On article Sony a7R II versus a7 II: Eight key differences (399 comments in total)
In reply to:

William Krusche: There used to be a time when we had to buy expensive magazines to keep up with the newest reviews. Now these reviews are free on sites like Dpreview. If Dpreview does indeed receive some extra 'advertising money' for posting articles like this one, then so they should. If amateurs like me don't need to go out and pay for overpriced magazines any more which were, by the way jam-packed with advertising, then you won't hear me complain.

Just F.I.O. Who reads new ModPhoto which is has been dead for 20 years.

Link | Posted on Aug 11, 2016 at 22:09 UTC
On article Sony a7R II versus a7 II: Eight key differences (399 comments in total)
In reply to:

William Krusche: There used to be a time when we had to buy expensive magazines to keep up with the newest reviews. Now these reviews are free on sites like Dpreview. If Dpreview does indeed receive some extra 'advertising money' for posting articles like this one, then so they should. If amateurs like me don't need to go out and pay for overpriced magazines any more which were, by the way jam-packed with advertising, then you won't hear me complain.

'Modern Photography' has been out of business for more than 2 decades since Popphoto bought it and shut it down.

Link | Posted on Aug 11, 2016 at 21:41 UTC
In reply to:

pburness: I can remember when 10Megabyte hard drives were considered high tech... How far technology has moved on.....

I can top all of you! I used 8 inch floppy disks with 64 kB capacity to store data from a $100k NMR spectrometer. This was much more advanced than walking back and forth to the computer center carrying a box of computer (cardboard) cards.

Link | Posted on Aug 11, 2016 at 02:47 UTC
In reply to:

FuhTeng: I enjoy their MTF - remarkable performance to have HIGHER resolution for 30 lp/mm than 10 lp/mm! Even the mighty OTUS lenses can't pull that off.

They are theoretical MTF curves and are meaningless. The actual MTF curves for manufactured lenses will be very different. Samyang/Bokinon has poor QC/manufacturing lately.

Link | Posted on Aug 1, 2016 at 18:28 UTC

Finally an update to my favorite tele. I find 85mm is too short and 135mm too long; 105mm is just right. It's been that way since my first 105mm f/2.5 Sonnar in 1966.

Link | Posted on Jul 27, 2016 at 18:31 UTC as 28th comment | 1 reply

Silver is so bourgeois. I'll wait for the gold one ;>).

Link | Posted on Jul 21, 2016 at 01:30 UTC as 18th comment
Total: 69, showing: 1 – 20
« First‹ Previous1234Next ›Last »