Sunday, January 30, 2011

SK Grimes improves the Linhof Technikardan

A common complaint with the otherwise noteworthy Linhof Technikardan is the fact the the front and rear standards are “L” shaped and as such there can be a tendency for movement during long exposures or sagging when using heavy backs. As shown in the illustration below, the rear standard (as ingenious and well-engineered as it is) allows quite a bit of movement both forward/backward as well as up/down.

This of course is not a problem for most ordinary photographs where the exposure is measured in fractions of a second. However, this behavior is particularly troublesome when using a heavy scan back like the BetterLight which requires a rock-solid platform during its typical 3-7 minute exposures.

Rather than sell my beloved TK 45 for the likes of an Arca Swiss, I contacted S.K Grimes in Woonsocket RI to modify my camera so that it would be rock-solid, yet allow full control, and also be removable on those rare cases when I needed 100% movements.

Based on a design sketch I provided them, they worked diligently to improve my camera as shown in the photograph at left.

To test the mod, I took my camera with me on a trip to Ireland last year to see how it would behave when creating large-format, digital panoramas. It took some getting used to remembering to unscrew the RIGHT side of the rear standard, but after a few tries it became second nature to me. The mod performed flawlessly providing a very stable platform to shoot in the windy Irish weather.

The result is a camera that is as solid as ANY other field camera, yet offers complete movements and no downsides. To say I’m happy with the result is an understatement!

Shown at left is the camera with the support removed for those rare times when I require full movements. It takes nothing more than an allen wrench and about 1 minute to remove it.

All in all, a simple, elegant solution that I’ll bet the Linhof engineers wish they had thought of!

J Michael Sullivan


You can contact S.K Grimes at
www.skgrimes.com

Sunday, January 9, 2011

Nikon Predictions 2011-2012

My Predictions: Nikon DSLR Roadmap 2011-2012


I've been a long time Nikon user. Recently I rented a D7000 and it got me thinking as to where these guys are going. So herein are my predictions for Nikon over the next 18 months. Please note that all of these are merely guesses and in some cases reflect what I WISH Nikon would do with their forthcoming system. Enjoy!

PREDICTION #1: the D7000 will get a companion camera with the name of D9000. In spite of what all the other sites are saying, after using the D7000 I've come to the conclusion that the D9000 will be the true replacement for the D90, not the D7000. Or more to the point: this camera will represent the high-end offering from Nikon for the advanced amateur/prosumer. The D9000 will use the same sensor as the D7000 and the D400.

PREDICTION #2: the D400 and D800 will share the same body and offer identical features except for the sensor. Why would I make this prediction? My observation is that 80% of on-location and event photographers now use two bodies while on assignment. Further, the new sensor on the D7000 is the equal of the D700 which is universally accepted as the standard in quality for on-location and event work. Given the extra reach that the cropped APS-C format offers, having a full-frame and cropped-frame camera in your kit only makes sense. Especially if they use the same accessories and have the same features. Given that the D7000/D9000 will offer the same quality as the D400, why would pros not pick up the cheaper D7000 or D9000? Simple: compatibility with pro-accessories as well as using the same layout, features, and controls. I'll go ever further: I think this combination of D400 + D800 will be the new killer combination.

PREDICTION #3: in keeping with the above two predictions, the new D5100 will be the "brother" camera to the D3100, sharing accessories, features, button layout, as well as the 14Mp sensor of its brother, the D3100.

PREDICTION #4: The D4s will leapfrog Canon will and after high-end video. I'm not talking about HD video either, but rather HD+ video like the RED digital camera (see www.red.com). In keeping with Nikon's historic conservative nature, I'll bet that the D4s camera will "only" be 16Mp, but be able to capture 24fps full-res images (in video/live view mode)! How will they pull this off? They will drop CF card technology and go to SDXC technology with RAID. Yup, Nikon will (hopefully) put 4 SDXC card slots and offer various RAID 0-5 configurations.

PREDICTION #5: The D4x will be positioned as a direct competitor to medium format digital cameras from Leaf, Hasselblad, and Mamiya. Thus we are talking 32Mp. To compete, Nikon will need to add more extreme high-res lenses to their line-up. Additionally they will probably have to bite the bullet and offer a 17mm tilt/shift lens to respond to Canon's offering.

The following table shows a comparison of features I'm hoping to see from Nikon. I'd love to hear your thoughts!

My Predictions: Nikon DSLR Roadmap 2011-2012


Tuesday, June 2, 2009

Gorillapod Focus - Evaluation

So I just bought a cute Gorillapod "Focus" model -- their so-called heavy-duty version capable of handling 11 lbs. And I wanted to see if this might be a good traveling companion for my D200.

Gorillapod Focus and Nikon D200

Overall, the quality of the build is excellent -- no cheap manufacturing going on here. The Gorillapod is comprised of three "legs", each of which articulates independently. These can be formed into nearly any shape. As such, one can "wrap" the Gorillapod around a branch, signpost, or handrail -- something few other products can do (the Manfrotto Super Clamp is a distant competitor that comes to mind). There is no doubt that this is one unique accessory that has many uses for the professional photographer. And as a clamp, I can highly recommend it for its imminent utility. However, as a tripod replacement I was concerned and needed to do some tests to see how this item performed in the real-world.

Using a Nikkor 180mm f/2.8 together with my D200 and remote cable as a test bed I wanted to see if the Gorillapod's flexible ball connectors would handle the mirror vibrations (or not). To validate things, I ran the same tests with MLU on for comparison. Here are my results:

******************************************************
TEST #1: GORILLAPOD FOCUS + D200 + REMOTE + 180MM (no MLU)

1/100 - good
1/80 - good
1/60 - good
1/50 - good
1/40 - bad
1/30 - bad***
1/25 - bad

1/20 - very bad
1/15 - very bad
1/13 - very bad
1/10 - very bad
1/8 - very bad

1/6 - unreadable
1/5 - very bad
1/4 - very bad
1/3 - very bad

1/2.5 - bad
1/2 - good
0.6" - good
0/8" - good
1.0" - good
1.3" - good
1.6" - good
2.0" - good
2.5" - good
3.0" - good
4.0" - good

Gorillapod Focus, no-MLU, 1/3 of a second exposureGorillapod Focus, no-MLU, 1/3 of a second exposure



******************************************************
TEST #2: GORILLAPOD FOCUS + D200 + REMOTE + 180MM + MLU
1/100 MLU - excellent
1/80 MLU - excellent
1/60 MLU - excellent
1/50 MLU - excellent
1/40 MLU - excellent
1/30 MLU - excellent
1/25 MLU - excellent
1/20 MLU - excellent
1/15 MLU - excellent
1/13 MLU - excellent
1/10 MLU - excellent
1/8 MLU - excellent
1/6 MLU - excellent
1/5 MLU - excellent
1/4 MLU - excellent
1/3 MLU - excellent
1/2.5 MLU - excellent
1/2 MLU - excellent
0.6" MLU - excellent
0/8" MLU - excellent
1.0" MLU - excellent
1.3" MLU - excellent
1.6" MLU - excellent
2.0" MLU - excellent
2.5" MLU - excellent
3.0" MLU - excellent
4.0" MLU - excellent

Gorillapod Focus, no-MLU, 1/3 of a second exposureGorillapod Focus, MLU, 1/3 of a second exposure

As you can see, the Gorillapod Focus clearly transmits the camera's mirror vibration from 1/40 sec to nearly 1/2 second. Keep in mind that these tests were using a remote release cable -- should you use your finger to click the trigger, one should expect even worse results! Not surprisingly, I got uniformly excellent results with MLU with all speeds. (in fact, noticibly better than ANY of the non-MLU examples). Presumably, wrapping the Gorillapod around a branch rather than using it in "tripod mode" might reduce the vibrations significantly as it would eliminate the "legs" which are likely the primary culprit in regards to the occilation we seem to be witnessing here. Unfortunately, I didn't test this so you're just going to have to extrapolate for yourself.

What does this mean to you?
If you are shooting a long lens together with the Gorillapod Focus model from 1/40 - 1/2 second, you are strongly advised to always use MLU. In fact, to be safe, I would advise MLU at all speeds with the Gorillapod since it seems to be one of those tripods that "occillates" at the slightest vibration. But then again, you already knew to always use MLU, didn't you? ;)

Does this mean I am going to return mine?
Not at all -- I feel the Gorillapod is a great travel tripod that fits neatly into my small laptop backpack (unlike any other midi-tripod which I would need to pack separately) and I will just have to adjust how I shoot when I'm traveling light. YMMV.

Recommended for:
- mirrorless DSLRs (e.g. Panasonic G1)
- Rangefinders (e.g. Mamiya 7 II)
- lightweight medium format cameras with mirror lock up enabled
- lightweight 4x5 cameras on windless days (e.g. Gaoersi 4x5, Toyo CF, etc)
- DSLRs and SLRs with mirror lock up enabled

Michael

*** a surprise here: I accidentally shot a continuous series of images at 1/30th (no MLU) and the subsequent images were signifantly WORSE than the first image taken at 1/30. Vibrations seem to amplify with this device.


P.S. lest you think I'm being unfair here, I re-ran the test using a Gitzo carbon-fibre tripod and Arca-Swiss B1 ballhead in non-MLU mode. Here are the (not surprising) results using pro equipment and technique:

******************************************************
TEST #3: GITZO + ARCA-SWISS B1 + D200 + REMOTE + 180MM (no-MLU)
1/100 Gitzo - excellent
1/80 Gitzo - excellent
1/60 Gitzo - excellent
1/50 Gitzo - excellent
1/40 Gitzo - excellent
1/30 Gitzo - good
1/25 Gitzo - good
1/20 Gitzo - good
1/15 Gitzo - good
1/13 Gitzo - excellent
1/10 Gitzo - excellent
1/8 Gitzo - excellent
1/6 Gitzo - excellent
1/5 Gitzo - excellent
1/4 Gitzo - excellent
1/3 Gitzo - excellent
1/2.5 Gitzo - excellent
1/2 Gitzo - excellent
0.6" Gitzo - excellent
0/8" Gitzo - excellent
1.0" Gitzo - excellent
1.3" Gitzo - excellent
1.6" Gitzo - excellent
2.0" Gitzo - excellent
2.5" Gitzo - excellent
3.0" Gitzo - excellent
4.0" Gitzo - excellent



MAGNAchrom: End of Article

Friday, September 26, 2008

Interview: Shelley Lake

Shelley Lake was interviewed at her studio in western Massachusetts on a lovely sunny summer day in June 2006. Her website can be found at www.shelleylake.com



MAGNAchrom: As an artist are you known as DOCTOR Shelley Lake?

Shelley Lake: Some people refer to me that way jokingly, but for the most part they call me Shelley.

MC You’ve been in the arts most of your life. As a child were you artistically-driven?

SL I started when I was three and have thought of myself as an artist all my life. Even when I was practicing chiropractic, I thought of it as a tactile art.

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Thursday, September 25, 2008

Portfolio: Diana Bloomfield


By Diana Bloomfield


My very first photography class, back in 1981, was titled “Large-Format Photography,” offered at Bucks County Community College, in Newtown, Pennsylvania. At the time, I didn’t have a clue what “large-format” meant, but going on the bigger-is-better theory, I immediately registered for it. Knowing as little as I did actually turned out to be a good thing. I wasn’t yet wedded to any one type of camera, nor was I restricted in my views of how I “should” be photographing. And, fortunately, no one had ever said to me, “You can’t work with a large format camera until you master the 35mm, followed by the medium format, followed by years of darkroom work,” comments I’ve since heard over the years, from both fellow photographers and instructors. In fact, I knew so little about photography, that composing an image upside down on the ground glass seemed like the most natural exercise in the world.

Working with a large-format camera taught me all I needed to know about light, exposure, and composition. Since I also wasn’t that accustomed to the relative ease and spontaneity that is inherent with a 35mm camera, I never felt I was giving up anything with large-format, which definitely taught me to wait, to be selective, and to take my time before clicking that shutter.

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Tuesday, September 23, 2008

Photokina 2008 Musings


HASSELBLAD UNDER PRESSURE!


So far, one of the biggest (and frankly totally unexpected) surprises at Photokina 2008 is the announcement by Leica of a "full sized" DSLR camera body offering a unique 37.5-megapixel, 30x45mm sensor together with a complete new line of Leica lenses. This camera offers both leaf and focal-plane shutters. Curiously, it reminds me greatly of a mini-version of the classic Pentax 67! If priced well, this could bring Leica back into the game as the full-frame camera arena is getting crowded these days and there is a speed and handling weakness with current digital medium format offerings by the likes of Hasselbllad, Sinar, Mamiya, PhaseOne, and Leaf.



Clearly, the move is both defensive, in that Leica can no longer look back to those halcyon days when it commanded the premier brand, as well as offensive — specifically to Hasselblad...

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Sunday, September 14, 2008

Modifying a Mamiya Tele-Converter 1.4xRZ to fit an RB67

By J Michael Sullivan




We RB67 owners are second-class citizens when it comes to comparing our beloved beast of a camera to its electronic brother the RZ67. Perhaps one of the most obvious examples is that Mamiya never offered a 1.4x teleconverter for the RB67 — something in my opinion is a glaring omission. Fortunately, the RZ67 and RB67 share the same mounting ring. I wondered: could I modify the RZ67 teleconverter to work with an RB67? I figured I'd give it a try.

First thing was to procure a Mamiya 1.4x tele-converter. Lucky for me there was one in exc+ condition on eBay that with some counter-bidding I was able to purchase for only $142. Upon inspecting it, it was clear that the primary problem with mounting it to the RB67 was two obnoxious studs that got in the way of the tele-converter from being mounted properly on the otherwise identical RB67 lens mount. Amazingly, I could find NOTHING on the internet regarding whether these two studs had any purpose other than preventing RZ lenses from mounting on RB bodies. I decided that they must serve no other purpose and herein document the steps I took to modify the 1.4x tele-converter for use with my RB67.

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