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 Re: Fujifilm GFX100RF Discussion Thread | |
RustyBug wrote:
rbf_ wrote:
RustyBug wrote:
chez wrote:
bwcolor wrote:
I asked Grok about the slowest handholdable shutter speed…
To determine the slowest shutter speed that should reliably yield very sharp images when handholding the Fujifilm GFX100RF, we need to consider its unique characteristics: it lacks in-body image stabilization (IBIS), features a medium format sensor, and has a fixed 35mm f/4 lens, which equates to a 28mm focal length in 35mm equivalent terms. The traditional reciprocal rule—suggesting a shutter speed of 1 over the focal length (e.g., 1/28th of a second for a 28mm equivalent)—is often insufficient for this camera due to its large, high-resolution 102-megapixel sensor and the absence of stabilization.
### Why the Reciprocal Rule Falls Short
The reciprocal rule was developed for 35mm film cameras and assumes a certain tolerance for blur based on typical sensor or film resolution and viewing conditions. However, the GFX100RF’s medium format sensor is larger than 35mm (with a crop factor of approximately 0.79x), and its 102-megapixel resolution results in a pixel pitch of about 3.76 micrometers—much smaller than that of lower-resolution full-frame sensors. Smaller pixels can make camera shake more noticeable, as even slight movement translates into blur across more pixels. Without IBIS to counteract hand movement, a faster shutter speed than the reciprocal rule suggests may be necessary for consistently sharp results.
### Evidence from Practical Experience
User experiences and reviews provide valuable insights into real-world performance:
- **Testing with Similar Cameras**: A test with the GFX100S II (also without IBIS) using a 30mm lens (24mm equivalent) showed a 90% success rate for sharp images at 1/25th of a second, dropping to 60% at 1/20th, and 30% at 1/15th. The GFX100RF’s 35mm lens (28mm equivalent) is slightly longer, suggesting a shutter speed closer to 1/30th might maintain a high success rate.
- **GFX100RF-Specific Feedback**: Multiple reviewers of the GFX100RF report that 1/30th of a second is the slowest speed at which they consistently achieve sharp handheld images. One reviewer noted success at 1/15th of a second with steady hands, attributing this to the camera’s leaf shutter, which minimizes vibration compared to focal plane shutters. However, this slower speed is less reliable across users.
- **Conservative Preferences**: Some photographers prefer 1/60th to 1/125th of a second to ensure stability, especially given the high resolution, but this exceeds the minimum needed for reliability.
### Role of the Leaf Shutter
The GFX100RF’s built-in lens uses a leaf shutter, which operates within the lens and produces less vibration than a focal plane shutter. This design can slightly relax the shutter speed requirement, potentially allowing sharp images at speeds slower than expected for a camera without IBIS. This supports findings where 1/30th of a second—or even 1/15th in skilled hands—yields sharp results.
### Balancing Resolution and Reliability
For a 102-megapixel sensor, sharpness is critical, especially when images are viewed at full resolution. While the reciprocal rule suggests 1/28th of a second (rounded to 1/30th in standard shutter increments), the high pixel density and lack of IBIS suggest a more conservative approach. Photographers sometimes double the reciprocal speed (e.g., 1/60th for a 28mm equivalent) for high-resolution sensors, but practical tests indicate 1/30th is often sufficient with good technique.
### Conclusion
Considering the camera’s specifications, the leaf shutter’s advantage, and empirical data, 1/30th of a second emerges as the slowest shutter speed that reliably yields very sharp images for most users. This speed aligns with a high success rate (around 90%, based on similar setups) and accounts for the GFX100RF’s unique design. While skilled photographers might achieve sharpness at 1/15th, and 1/60th offers extra assurance, 1/30th strikes the balance of reliability and practicality.
Thus, the slowest shutter speed that should reliably yield very sharp images with the Fujifilm GFX100RF is **1/30th of a second**.”
For those with a steady hand 1/30 second , f/4.0 and ISO 3200 will go a long way to making sure you don’t miss the shot. For me, I’m not one with a steady hand.
For my real world shooting 1/30 is too slow as my subjects don’t sit still. One needs to really look how they’d be using the camera to determine what affect lack of ibis would have on their shooting style. I’m either at the 1/125 range or if I’m shooting landscapes at the 1/10 or longer range which I then use a tripod.
I’d be counting n the high iso abilities of the camera more than ibis.
+1 for understanding use case ... and the dividing lines for where your strategies apply vs. differ in approach.
Very true. I had a feeling Chez would be interested knowing his photographic use cases and the fact he had been sniffing around GFX releases for years. They were just always too big.
Yeah, I looked at the GFX 50R, "back when" ... but, something about Fuji GFX builds is just rather "bulky". This new one brings a degree of svelte to the GFX that we've not seen before.
It's not just the size ... but the size and the shape / form for how it fits in your hand, etc. ...
Just about any hammer can drive a nail, but some hammers lend themselves to be used all day long ... and others you're ready to be done in about three swings.
It's definately on the bulky/heavy side of things. I've converged on the 20-35, 35-70 and 100-200 for my default bag and that's pretty manageable. But yeah this is really different in terms of form factor for the GFX system.
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