Lives in United States Tucson, AZ, United States
Works as a Physics PhD Candidate
Joined on Jul 17, 2006


Total: 152, showing: 1 – 20
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In reply to:

Arkienkeli: Well, might be a fine lens, but consider this:

Olympus 300m f/4 for m43: 227mm and 1.27 kg
Nikkor 300mm f/4 for 135: 147mm and 0.755 kg

Nikkor is also cheaper.

As someone who actually shoots these sorts of lenses, the Olympus 300 and the Nikkor 300 are going to be used for much the same sort of work. The pixel density is similar between 24MP DX (what I shoot) and 16MP Four Thirds, and the Nikon can always be teleconverted into a 630mm equivalent (while retaining sharpness).

These lenses are going to be used for, essentially, the same stuff. They're both good at it.

Link | Posted on Jan 12, 2016 at 06:24 UTC
In reply to:

Arkienkeli: Well, might be a fine lens, but consider this:

Olympus 300m f/4 for m43: 227mm and 1.27 kg
Nikkor 300mm f/4 for 135: 147mm and 0.755 kg

Nikkor is also cheaper.

@Sabatia: Was this the old 400 DO, or the new one?

I've used the Nikon 300/4 Fresnel under very demanding conditions: on the D7100 (pixel dense sensor), wide open, and with a 1.4x teleconverter. It was excellent -- one of the best lenses I've used.

Link | Posted on Jan 11, 2016 at 21:01 UTC
In reply to:

Lehik: Nice lens. There seems to be quite a lot of easily noticeable moiré in the heron picture. Was it so that the OM-D E-M1 does not have an AA-filter?

That's clearly moire, caused by the fine structure of the feathers.

Link | Posted on Jan 11, 2016 at 16:36 UTC
In reply to:

Arkienkeli: Well, might be a fine lens, but consider this:

Olympus 300m f/4 for m43: 227mm and 1.27 kg
Nikkor 300mm f/4 for 135: 147mm and 0.755 kg

Nikkor is also cheaper.

The argument makes no sense -- we're spoiled for choice. Both 300 f/4's are great lenses; I've shot the Nikon one, and I have no doubt the Olympus one is fantastic, since most Olympus lenses are fantastic.

Both systems should be able to do well.

Link | Posted on Jan 9, 2016 at 05:23 UTC
On article Nikon D7200 Review (637 comments in total)
In reply to:

Faisalee: Hi DPreview,

I have been a long time follower of this wonderful site, since the time of Nikon D1 days! the reviews have always been great source of info BUT!

The following has NEVER happened before, at least I have never seen it here before!

Pros: Reasonably small, light body for a DSLR at this level
Cons: Camera is bulky when compared to mirrorless rival

Why is a DSLR being compared to a Mirrorless? "Single Lens Reflex" is not Mirrorless guys, please!

First its reasonably small, light bidy for a "DSLR" at this "level" and then you guys go out of the way and totally change the "level" and compare it against a mirrorless?

One of these have to go, either the Pros or the Cons :)

"Why is a DSLR being compared to a Mirrorless? "Single Lens Reflex" is not Mirrorless guys, please!"

Because they do the same sort of thing. The review is fine: "It's small compared to other DSLR's, but large compared to mirrorless cameras which do much the same thing."

Link | Posted on Aug 10, 2015 at 16:49 UTC
On article Nikon D7200 Review (637 comments in total)
In reply to:

cwm10k: I'm torn, do you go with the Nikon D610 or the Nikon D7200?

Depends. Do you want to shoot DX or FX? I'm a wildlife person so I'd rather have DX. If you do indoor photography you probably want FX.

Link | Posted on Aug 10, 2015 at 16:48 UTC
In reply to:

Dylthedog: I was a childhood fan of Olympus - I desperately wanted an OM-2 back in the day. I couldn't afford one then so lived happily with my OM-10 and and manual adapter.

The since those days I've been saddened to see the company's decline, despite a history of innovation and some truly superb optics (which I don't think ever got the credit they deserve). Just goes to show what a few wrong turns can do to what used to be a household name.

I'm glad to see they are on the up, albeit in a modest way.

Some of the original Four Thirds designs were fantastic -- the ability to get equal sharpness at wider apertures did a great deal to close the gap between the 4/3 and FX sensors.

Link | Posted on Aug 10, 2015 at 16:16 UTC
In reply to:

photo perzon: IQ like the dogs. Fast AF but the look of over dark over sharp.

The 12MP sensors had problems, but all of the E-M5 and newer sensors have been excellent. They're behind the best DX sensors at the same ISO, but you can shoot at ISO 1600 with no problems. But there are so many great fast primes that you can compensate to a large degree.

Link | Posted on Aug 10, 2015 at 00:51 UTC
In reply to:

A Girard: Who thought quality products could actually attract a following.

If Olympus' 300/4 had come out when I was in the market for a new camera I'd be shooting m4/3 rather than DX. Other than the bad 12MP sensors they got stuck with for a while, all of Olympus' products have been excellent.

Link | Posted on Aug 10, 2015 at 00:49 UTC
In reply to:

QuarryCat: first series of mft-lenses are all bad, beside 5.6/9-18 mm - all much worse then the lenses from Panasonic
and now the PRO-lenses are good concepts but it's more illusion than reality... and very expensive too.

Olympus mFT is only a shadow from Olympus FT...

so they get more profits.

Don't get me wrong - Olympus has done a lot for digital photography - even more then most other photo-compagnies... they still deliver fantastic colors (even in JPEG), a real good IBIS (but only in E-M5II) and dust proof

but new mFT cameras and lenses are made for 1-3 years and just for beginners and amateurs as bad as Sony does with NEX

A heavy price for profit... and we have to pay for the criminal faults of management!

The Olympus primes are excellent; 12/2, 25/1.8, 45/1.8, 75/1.8...

Link | Posted on Aug 8, 2015 at 19:32 UTC
In reply to:

darngooddesign: Since the new Monochrom is the the only Leica that causes this problem it is logical to assume there is something nona-standard in it's DNG files.

So, the real question is whether Apple had access to one of the cameras, or even Monochrom-produced DNGs, before the current version of Photos shipped.

But yeah, Apple bad...rabble rabble rabble.

If a computer program damages data when fed unexpected input, it's a bad program. Period. Apple's software should either:

1) Work properly with the Leica files;
2) Throw an error message saying that the format isn't supported;

or maybe

3) Misinterpret the data in the raw files and display a corrupted image, but not mess with the whole catalog.

It very certainly should not explode and wreck other data.

Link | Posted on May 17, 2015 at 13:44 UTC
On article Nikon D7200 real-world samples gallery posted (145 comments in total)
In reply to:

ttran88: They could have possibly reused d7100 samples and call it a day.

The Toshiba sensor in the D7100 is fantastic, though; it seems like we're spoiled for good sensors these days.

Link | Posted on Apr 1, 2015 at 14:24 UTC

Looks like a Canon version of the Nikon 80-400G. That Nikon is an excellent lens so if Canon's lens wonks are as good as Nikon's, it should be a good thing.

Link | Posted on Nov 14, 2014 at 20:34 UTC as 4th comment

I wonder how the AF compares to the system in the D7100, the closest thing Nikon makes? AF speed and accuracy, more than anything else, is the killer feature for the sort of action work that this thing is designed for.

Link | Posted on Sep 23, 2014 at 18:53 UTC as 22nd comment | 17 replies
On article Sigma announces two 150-600mm F/5-6.3 DG OS HSM zooms (138 comments in total)
In reply to:

DVT80111: There is no fun carrying heavy and long lens. Why haven't anyone designed a long tele-lens just for APSC to reduce its size and weight. Most birdly people use APSC camera anyway. Why do we have to pay and carry extra weight just for the lights (2/3 of them) we don't capture?

It doesn't work that way: normal and wideangle lenses can be made substantially smaller for APS-C, but telephoto lenses for APS-C and FX are basically the same.

Link | Posted on Sep 14, 2014 at 15:40 UTC
On article Ricoh announces Pentax XG-1 superzoom (205 comments in total)
In reply to:

W5JCK: Super yawn....Another camera with a small sensor and little to offer. Putting a long zoom on a lackluster camera doesn't make it good or make it worthy of being on this site. This kind of cheap camera is going to be bought by people who don't read sites like this, or they would know better. I'm not sure why DPReview still brings us information on these little sensor cameras or for that matter smartphone cameras. Maybe their newest members have been dumbed down to that level. This used to be a site for enthusiasts and professionals, not so much now...

I have a 20" print on my wall taken with an eight-year-old small-sensor superzoom (Panasonic FZ50) that looks *fantastic*. I shoot Nikon DX now so I know what modern large sensors can do, but these small sensor cameras -- at base ISO -- can deliver some very impressive results.

Don't insult someone else's tools because they aren't as expensive as others; look at the results. Are there limitations to small sensors? Certainly. Can they be worked around? Sometimes, they sure can, and the results are not half bad.

Link | Posted on Jul 15, 2014 at 15:50 UTC
On article What is equivalence and why should I care? (2163 comments in total)
In reply to:

rfsIII: There must be an professor of imaging science out there somewhere who can be hired by DPR to write a nice counterpoint article that will untangle this topic and bring sanity to what is essentially a holy war between two under-informed camps. I would start at http://www.rit.edu/cos/optics-rit and work westward from there.

@Bustard, it really is that simple -- I don't know why people try to overcomplicate this beyond what you have just described.

Link | Posted on Jul 9, 2014 at 17:23 UTC
In reply to:

dzukela: copy, steal, copy, pilfer, copy, filch, purloin, stealing...
That's google android.

Android and OSX both "copied" a real operating system to get their start: Unix.

Link | Posted on Jul 2, 2014 at 14:52 UTC
In reply to:

sdh: Does RAW actually offer benefit in smartphone-size sensors?
RAW has real benefit with DSLRs and regular point-and-shoot type cameras because the image sensor can capture a larger range of information than the jpg format can store.
But the margin decreases as sensor size decreases (decreasing dynamic range).
Do smartphone sensors actually have headroom beyond what jpg can store?

And separately I can't help thinking that if you're fussy enough about your images to manually post-process RAWs (because there's no point shooting RAW if you don't) then you probably should be doing photography on a device with a proper handgrip and shutter button (ie a real camera even if only a compact and not a smartphone).


Noise reduction is crucial on data coming from a tiny sensor, and that can be better done by a 35-watt Core i5 in a few seconds than by a smartphone CPU running on a few hundred milliwatts in a few tens of milliseconds.

Link | Posted on Jul 2, 2014 at 14:52 UTC
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