Hello everyone,
I realized today that threads on the OM-1 are pretty much split between this ("Olympus") subforum and the "Micro Four Thirds 4/3 Photography" subforum. It might be best to direct OM-1 discussion to the latter page, but I wanted to follow up on the conversation here.
First of all, Chris, I tried A priority for a few sessions, but I discovered that for me, S priority works better as a general rule. I am using the OM 100-400mm, with the 1.4x TC attached, so my apertures have very little range anyway, basically 7.1 to 9.0 I think. For you, with the 150-400mm PRO lens, it makes sense to maximize your light with the widest aperture, and let the camera find the fastest S/S automatically, as Mike Lane discussed is common for pro photographers. For me, with the slower lens, I'm more likely to be experiencing compromises between high ISO and slowish S/S, so I need to be constantly making decisions about what S/S gives me the best tradeoff. In these conditions, the camera will always give me the widest aperture available anyway.
So I now have C1 (stationary birds) = S priority, 1/500 sec, C-AF/MF, silent sequential 5 fps, ISO-A Upper limit = 102400, Bird detection.
And C2 (birds in flight) = the same except 1/2500 sec, silent sequential 15 fps.
For quicker switching between silent sequential and Pro Capture, I went into Camera 1 menu > 7.Drive mode > sequential shooting options and unchecked everything I could, except for Silent Sequential and Pro Capture. So now the dial just has to turn one notch to switch between Pro Cap and my default mode. I'd prefer having a button to toggle Pro Capture, but I don't think there's a way to do that (unless I wanted to create a whole Custom mode for it which seems silly), so this is the fastest system I could figure out. So now if I want to switch into Pro Cap, the sequence is: (1) tap the front half-button the left side of the camera, (2) drag rear dial one notch to right, (3) tap shutter button, and I'm ready to start.
Arguably I should be using SH2 instead of silent sequential, but I prefer not to be wading through too many images. I think I got the 5 fps and 15 fps recommendations from Stephen Ingraham's videos, and I like the compromise so far.
I have the lever set up to switch from All to Single AF target when moved to position 2. But I almost never use that. I find the MF with red peaking works really well so I generally just switch to that for bird-in-twigs.
Yesterday I had my first real opportunity for BIF, and results were great for a cormorant and pretty good for barn swallows. For the fast moving swallows it's hard to get them very large in the FOV; here I can really see the advantage of a full frame camera with larger resolution to get more details. But results are still a thousand times better than with my E-M1.2!
I was also sometimes able to get "quick grabs" of random birds flying by (with sharp results), which is exactly what I had hoped - this is the perhaps the biggest reason I bought this camera, e.g. for parrots in my last trip to the tropics that never settled into a tree, I just wanted to get a photo for ID purposes, so I think the OM-1.2 will help a lot for that.
In the E-M1.2, one of my biggest objections was there was no way to set a really high max ISO for ISO-A (I think the max allowed was 6400 which drove me crazy). In the OM-1, I set it to 102400, which leaves me with total control of the S/S vs. ISO tradeoff. If I really want/need a fast S/S (e.g. hummingbird), I can do that, and let it automatically switch to a crazy high ISO-A, and decide later which settings came out best.
Yesterday I was out at midday with blue skies. For statinary birds (some were in shade), my ISO-A was giving me 200 to 640. For BIF, surprisingly my ISO-A did not go higher than 800, and was often 400. I did lose a number of shots to motion blur on the stationary birds, so I need to be more alert to increasing the S/S when the bird is moving slightly.
I had surprisingly bad results with a great blue heron. The camera seemed to be showing green rectangles on the bird's head, but under scrutiny it seems it focused on the horizontal ripples on the water, behind the bird. Or maybe it focused on the bird's legs. It's probably best to always do a few shots using MF, just in case the AF/bird AI gets fooled.