Lives in United States MD, United States
Works as a Computer guru
Joined on Aug 5, 2004


Total: 63, showing: 1 – 20
« First‹ Previous1234Next ›Last »
In reply to:

sneakyracer: Pentax 645z is $13500 with the Excellent 28-40mm lens.

Pentax had a patent for a modular camera for many years that allowed the swapping of film and digital backs but never elected to fund production.

Direct link | Posted on Dec 18, 2014 at 05:31 UTC
In reply to:

Paul Guba: Comparing two cameras with similar sensors is like comparing two cars with V8 engines. The 645Z and the Alpa are two completely different machines. I won't justify the huge price difference but at the same time you can't compare the two as tools. Phase also has better software and years of experience getting the best data from a sensor. There both great cameras but the similarity ends at MP.

Lets see, if I remember the film era correctly in Photodo's technical tests of lenses in the top 10 of all time there were 2 Contax (Zeiss), 2 Leica, 2 Canons, oh and guess what there were 3 Pentax and 1 Tokina. I guess those yearsin which Pentax collaborated with Zeiss must have rubbed off.
As for Alpa in that era their lenses were sourced from Schneider, Kern, and Angenieux mostly.

Direct link | Posted on Dec 18, 2014 at 05:28 UTC
In reply to:

jonmcphoto: WHO are these cameras for? Why don't they get a Bugatti special edition and go ahead and ask $250K for it?

Having shot an Alpa 9D for awhile during the film era I can say that most or all of the lenses they supplied then were very good. Alpa usually sourced their lenses from the very best European makers. Their standard lens in those days was a 50mm macro that was very good.
Still due to cost/performance I would go for a Pentax 645Z before the Alpa 12.

Direct link | Posted on Dec 18, 2014 at 05:05 UTC
On Consumer SLR Camera Roundup (2014) article (116 comments in total)
In reply to:

Marty4650: A really interesting "update"...

1. Canon SL1 - 17 months old
2. Canon T5i - 17 months old
3. Nikon D3300 - 7 months old
4. Nikon D5300 - 10 months old
5. Pentax K-50 - 14 months old
5. Sony SLT-A58 - 18 months old

It's like a trip to a museum to see the dinosaurs.

You should have said invertebrate. That would be correct for the timeline of evolution.

Direct link | Posted on Nov 27, 2014 at 04:15 UTC
In reply to:

offertonhatter: Cheap looking but not really cheap feeling if other recent lenses are to go by. HD coating, excellent.
DC motor? Ditto. Weather sealing? Excellent.
Very flexible zoom range, but only after tests will we know how it performs. No point in presuming until tests are done.
35MM FF? Maybe a typo, but possibly not.

Lets wait for the performance tests before slagging it off.

Finally to another poster, it is spelt dying and not dieing. And that word has been mentioned for the last 35 years when it comes to Pentax, and yet........

When you consider the Hi-ISO performance of current sensors the actual need for faster lenses is no longer mainstream, especially when compared to the film era. If you need shallow DOF, shoot in low light, or shoot sports then faster lenses make sense. Otherwise its just carrying more weight.

Direct link | Posted on Oct 30, 2014 at 04:27 UTC
In reply to:

DenWil: Would someone care to take a stab at explaining to me why an 85mm lens purpose built to cover an 24 x 18 image circle by Pentax is not proportionally equal to an 85mm lens when it is purpose built to cover a 36 x 24 image circle by Zeiss?

If an 85 is actually a 130 then what is the 85?

While the lens is the same focal length regardless of the sensor the FOV is different depending on the size of the sensor of course. However the viewfinder of an APS-C camera only shows what the sensor can see so like the sensor the VF is also a crop in FOV. If you put a dedicated crop sensor 85mm on a FF body the image will appear to be the same as a FF 85mm but there will be severe vignetting in the corners. Some Pentax lenses, especially primes, are actually FF lens (DA* and D-FA*) that will function without significant vignetting on the presumed Pentax-Ricoh FF they say will be coming out (whenever).

Direct link | Posted on Oct 30, 2014 at 04:17 UTC
On Canon EOS 7D Mark II: A professional's opinion article (509 comments in total)
In reply to:

Wes Syposz: she never really explains why she prefers a FF...

You must be clueless. Angle of view is the correct name for what you said. Angle of view and field of view mean the same thing expressed in different measurements.

Direct link | Posted on Oct 23, 2014 at 04:42 UTC
On Canon EOS 7D Mark II: A professional's opinion article (509 comments in total)
In reply to:

Frontfocus: What a bunch of crap.
A crop sensor is a negative point?!?!?! :

- crop sensor give some more reach. Well a 1.6 X factor is worth thousands of dollars compared to FF if you use longer lenses.
-She likes knowing that her lenses are true to their focal length. I think a real photographers just cares about framing (real time) and are not constantly thinking what focal length the zoomed in/out.

Record voice: well the 5D3 has not option for that either. What is she talking about.

I wouldn't mind to pry her 1DX systems from her hands and they don't have to be cold dead :-)

You need to grow up yourself. If you are a sports pro and don't have to "buy" your own lenses then APS-C would be a negative like she says. Personally I only shoot crop sensor but I know where she is coming from. My brother is a 40+ year full time pro who shoots LF, MF and FF. I am a 40+ year amatuer who takes paying gigs when I feel like it but stays in APS-C mainly for the positive she mentions.

Direct link | Posted on Oct 23, 2014 at 04:19 UTC
In reply to:

Wes Syposz: looks kind of big, maybe is an optical illusion due to the use of the extreme wide angle lens with the exaggerated perspective, wrong choice IMHO to demonstrate the actual size, Eh... Dpreview

A lens that is optically 600/6.3 is going to have a front element about the same size as a 500/5.6 or a 400/4.5, meaning usually a 95-105mm filter size. So yes it is big but compared to what?Thinner but a little longer than a 120-300/2.8. Closer to Pentax's legendary F/FA* 250-600/5.6 (about the same length but the Pentax had a 112mm front filter I think). About 1/2 stop slower with greater zoom range. If it was as good as that lens they will sell thousands of them. Too bad they may not make it in Pentax mount (good thing I have a Canon system also).

Direct link | Posted on Sep 24, 2014 at 22:19 UTC
In reply to:

lambert4: Where are the micro four thirds mounts? Come on Sigma give us a little love for our little sensors.

In "minor" he means you could remove the tele-negative rear group maybe. Doesn't mean it will still work normally as this can sometimes change the registration distance plus it might not allow the light cone to fully illuminate the FF sensor. They have been using such groups ever since they found that by using them they could make the lens shorter than its listed focal length would normally be. Sort of like having a TC built into the rear. I remember my Sigma 1000mm F8 APO was like that back in the 90's. Lenses was about the same length as a 600mm lens. However usually those things are only about 1.2x-1.5x in magnification not 2x.

Direct link | Posted on Sep 24, 2014 at 22:04 UTC
In reply to:

Joe Mayer: Quick releases need to be convenient and yet difficult to do accidentally. I'm not sure I like this one. All moot though as there are a lot of alternatives that exist already. And I suppose that personal preference comes into play as it does with most things and fwiw, mine is to use an old fashioned camera strap and support my camera with two points as the manufacturer intended and I feel comfortable with.

This is not that different from a regular "pro" carry that you can do with a regular camera strap that people have been doing for decades. Looks like one of those $50 solutions to a $5 problem. While it looks nice the old way carries the camera + lens in exactly the same position for a one-handed manipulation without that cost.

Direct link | Posted on Sep 8, 2014 at 21:02 UTC
On Accessory Review: Drobo Mini RAID article (149 comments in total)
In reply to:

Lukas Gal: Little mistake RAID = redundant array of independent disks not Inexpensive.

Sorry also. In was "inexpensive" from the original designers/inventors of RAID because you could use cheap non-server rated drives in simple RAID systems. Later on the RAID manufacturers changed the wording because they didn't like the idea of inexpensive since RAID systems are not exactly cheap compared to comparable single drive systems. And in actuallity all of the RAID modes up to 5 existed before the name RAID was even published in a paper.

Direct link | Posted on Aug 19, 2014 at 21:09 UTC
On Readers' Showcase: Astrophotography article (44 comments in total)
In reply to:

rrccad: so out of all these, only one would I consider the be "astro-photography" which is a challenging discipline in it's own right.

the rest i consider nightscapes. it's a shame that only one DSO made it on this list, as photographing DSO's is a technological challenge , extreme patience and time far exceeding that of the regular nightscape photograph.

I agree as a 45+ year astrophotographer only #3 and #8 qualify as far as I am concerned. Not to mention I was doing as good as #8 as a junior high school student in 1963 with an RV-6, Practika 35mm, and Plus-X film.
Every astro-imager has to start somewhere but calling these exceptional (except #3 which is decent) would tend to call into question the experience of the person choosing them.

Direct link | Posted on Aug 18, 2014 at 19:19 UTC
On Tamron SP 150-600mm F/5-6.3 Di VC USD Lab Test Review preview (234 comments in total)
In reply to:

racketman: is this lens actually still for sale anywhere?

This lens is brand new not to be confused with anything made previously. It was only announced late in 2013.

Direct link | Posted on Jun 25, 2014 at 21:04 UTC
On Sigma 50mm F1.4 DG HSM | Art Lab Test Review preview (566 comments in total)
In reply to:

ulfie: Size-wise, it's a dang blunderbuss! Kind of negates its low-light, f1.4 shooting abilities if camera shake adds blur due to its size/length, no?

It is actually easier to hold a heavier item steady than a lighter one when you need to point it at something. Just ask any professional shooter. Lighter weight is better when you need to move something you are pointing, like when panning.

Direct link | Posted on May 29, 2014 at 05:51 UTC

Doctor Optic

Direct link | Posted on Apr 2, 2014 at 04:14 UTC as 19th comment
On Battle of the titans: Top ball heads tested article (269 comments in total)
In reply to:

TheDman: I'm not sure how a ball head improves my experience. Why would I not want the control of my pan/tilt that came with the tripod?

I used pan/tilt heads for about 2 decades. Then I bought a big used Graf Studioball so I could mount a Wimberly Sidekick. Since that time 25 years ago everytime I buy a new tripod I chuck the pan/tilt head into a box and put a ballhead on it instead. The only time they come out of that box is when I decide to sell one. I still have that Studioball and it still works fine, even though I have other Arca-plate ones.

Direct link | Posted on Jan 14, 2014 at 05:28 UTC
In reply to:

ceaiu: Why is everyone assuming only Sigma is affected? Maybe they're the only ones (or just the first) to have a fix.

Sorry but both Tokina and Tamron pay licensing fees to just about all the camera makers that don't have an open standard mount. Camera makers, including Nikon, are willing to make a buck just like everyone else. Most don't know that the Big 4 (Canon, Nikon, Minolta, and Pentax) have had a cross licensing agreement on their patents for at least 4 decades.
Sigma on the otherhand, due to the lawsuit they won, can only reverse engineer everything (except open standard mounts). And occasionally when a new camera comes out the OEM may change some responses in the code table and may make Sigma lenses erratic. Whether intentional or not I don't know. At least until Sigma can figure out the changes and redo a firmware fix. As far as I know any Sigma DG lens should be fixable, but I know absolutely that any non-DG lens will not be fixable. I have an analog era Sigma 100-300/4 EX HSM IF in Canon that still works with bodies upto and including the 60D but have not tried it on anything later.

Direct link | Posted on Nov 20, 2013 at 08:10 UTC
On Ten one-of-a-kind cameras from the 21st century article (248 comments in total)
In reply to:

zycamaniac: Not to be picky, but 2000 is the last year of 20th century...

Its true though. There was no year 0 so a decade goes from year 1 to year 10 (1 BC was followed by 1 AD). That means a century (100 years) ends at x000 not x999.

Direct link | Posted on Sep 5, 2013 at 02:09 UTC
On Ten one-of-a-kind cameras from the 21st century article (248 comments in total)
In reply to:

Sordid: What happened to Eye Controlled Focusing by the way?
IMO an extremely useful thing!

Pentax actually did the original R&D on eye-controlled focus but never decided to keep going on it to put it in any of their cameras. Canon picked up the ball and ran with it. One of its issues was on the EOS-3 if you had the AF set to 45 point it would often switch points from the time you wanted the picture till the time you pressed the shutter. As a result many pros just left it in 11-point AF mode. One reason why most DSLRs still have between 9-15 AF points. Too many is often too much.

Direct link | Posted on Sep 5, 2013 at 01:57 UTC
Total: 63, showing: 1 – 20
« First‹ Previous1234Next ›Last »