Chris Ross

converting to jpg files for Windows users:

This certainly doesn't match my experience, do you set the mini flash to 1/64 manual power? I sat at my desk today and fired off 10 shots in succession in single shot and the flash went off everytime. On my last dive trip I used the OM-1 and did 3 dives/day and had 30-40% when done for the day, using OM system battery that's about 2 years old, the body is showing 14,400 shutter count on the two batteries I have. How many shots do you take on a typical day? I seem to average around 250-300 or so over the course of 3 dives.

I don't think there is too much more beyond being on Manual flash at 1/64 power. Looking in the menus RC mode is off, X-sync 1/250, slow limit of 1/60 flash compensation off. red-eye reduction off, first curtain. At 1/64 flash power I get at least 10 exposures clicking the shutter one after another in single shot mode. This is with an OM-1, I previously used the EM-1 MkII and I remember it being quite similar. The mini flash gets its power from the camera, so maybe check if the hotshoe contacts are clean?

I'm not sure that's the only reason it's so popular for macro, in addition there's a complete range of macro lenses including the 90mm macro which goes to 2x by itself and at that magnification has the equivalent framing of a FF at 4x. The in-body IS is also highly regarded, the smaller sensor is easier to accelerate to compensate for shake. I have taken shots with the 300mm f4 lens at 1/13 and they have come out tack sharp and can use ridiculously low shutter speeds with the 90mm macro. It's also what allows hand held focus stacking and super resolution shots. Probably not so useful UW, but it does compensate for any movement except for in and outwards and helps hold the AF point on your target. In addition the smallest AF point in the OM-1 is smaller still and uses a single AF point, while the small option uses a group of points and the camera selects which to use in that area. You can set the number of points the AF point will move with each click of the controls, here is the relative size of the targets: The OM-1 has 1053 covering the frame quite effectively and they are closely spaced. The only issue with such a small point is it needs to be placed over some contrast, though often a small movement is enough for the AF system to grab. The AF system also works quite well in low light, I found with my old EM-1 MkII it could gab focus on mandarin fish at dusk without a focus light. Having used this system on land the limitation when hand holding is how stable I can hold the camera to stay on target at maximum magnification. Even with the IS I have to take extra care to stay stable and moving subjects adds another layer of complexity. UW I mostly shoot around Sydney and the surge and current places limitations on how much magnification I can use not to mention the ability to actually find ultra small subjects UW. For this reason I use only the 60mm macro UW and find it has plenty of magnification.

Seems like a camera issue - I certainly don't see this with the OM-1 and seems like others don't see it with that model. Seems like it has tracking turned on even though you didn't set it.

I use the same mini flash to trigger my strobes I have never run into recycle time issues, I shoot only manual and set the the mini flash at 1/64 power manual flash. Admittedly I don't shoot rapid fire, but often squeeze off single shots in fairly quick succession. The Nauticam manual LED trigger is reported to work well and has the bonus of allowing shooting at up to about 1/400 and maintaining flash sync. If you are shooting TTL, you'll have these slow recharge issues with any of these small flashes and the only solution is an LED trigger. In fact I think most of the small accessory flashes are manual only.

It seems the issue is the difference between AF-C and AF-C plus tracking. I just played with my OM-1 and it was quite capable of using a very small AF point in AF-C, however for AF-C + tracking it draws a box around what it thinks you want it to track and this is where algorithms for choosing a subject come into play. It will lock onto what the system thinks you want and generally it will be the body part or object with the best contrast, but it depends on how it is programmed and it seems it chooses to use a bigger box when tracking is used. Subject recognition is the same deal it depends on how well it recognizes your subject. Another aspect of this is how well the Image stabilisation works- it can be particularly helpful in keeping the AF point stable on the subject if you sway a bit. If you move in and out in super macro you will be adding in the the AF speed and whether it can keep up as well. I find I'm not so stable as when I was younger and the IS on the OM-1 is a godsend. It really helps keep you subject framed properly - the smaller sensor is easier and quicker to accelerate and seems it quite stable enough to do hand held focus stacks. It seems to me that how well you like a particular AF system is a little personal and depends how well it can compensate for your instability. Water should slow things down a bit (unless you are dealing with surge or current) and again I think trying out some systems on land would be a good starting point.

Seems like the best thing you could do if it is available is to go to a physical camera store and try a few candidates out, Bring along a small model of some type which would allow you to test for precise AF placement. I know my OM-1 has a very small AF point available, the limiting factor is probably if the subject has enough contrast and beyond that holding the camera sable enough at high magnification. The stabilisation is a big help here. The OM-1 seems to be a favourite among macro bug photographers.

Welcome Lidas, good to have you join us.

welcome aboard Rob, good to have you here. As Davide said, doesn't seem possible to do anything at Wetpixel. It's basically a ghost ship, you can still post and reply there and search old content, but that's about it. Apparently it has been set to a mode where only logged in members can see posts there and there's very little activity these days. But having a profile means you can lookup old content there as long as it stays up.

Hi Tom, sorry to labour the point, I wasn't 100% sure I was interpreting it properly myself so I went ahead and did a test myself. I set up the camera in a housing and dipped the flat port in a tub of water and took a photo of a ruler with the lens set at 1:1. This is with an Olympus 60mm macro which has a switch to move it to 1:1. I lowered the housing on a slider into the water till the ruler came into focus and locked it in place. Here's the setup: And here's the result: You can see that the sensor records a field 17mm wide which matches the reported width of the m43 sensor of 17.3mm . I measured the working room from the port and set it at that position but found I needed to back off to achieve focus, which means this effect gives you more working room at maximum magnification. I cross checked by lowering the port a little and it would no longer reach focus proving I was at minimum focus distance and achieving 1:1 magnification. I think you might be right about having more airspace inside the port it would allow you to focus closer to the port and record a larger virtual image - but it would be best to test that. It seems counter intuitive but the link I provided above on flat ports explains. the critical points are: A flat port magnifies because you are looking at a virtual image which appears to be closer so appears larger. to record the virtual image you need to be able to focus on it and are limited by the virtual image distance. If you get steadily closer to the subject the virtual image gets closer until the lens can no longer focus on it. this occurs when the subject is a distance where 1/1.33 = 0.75x magnification in air would occur. The virtual image at this point is 0.75 x 1.33 = 1.0 magnification. This means when the lens is focused at 1:1 the subject is at the same distance it would be if it was at 0.75x magnification in air. You can't magnify more because the lens won't focus any closer. If you scroll down to the paragraph first the flat port it will explain. Understanding Flat Port and Dome...Understanding Flat Port and Dome Port TheoryOne of the key features of underwater photography is the dome port. Despite it's ubiquity, it's effects are largely misunderstood or at the very least, poorly explained. In this post I'm going to...

Marelux have a +5 they have just released recently haven't used it of course but could be decent quality. You could ask Phil Rudin if he has tried it?

I've no doubt it works well for a lot of people. I'm happy with what I'm doing and I think it suits some people better than others - no judgement just do what you find works! I believe Capture One can do something similar but I haven't dug and explored how to do it as yet.

The Nauticam port charts at one time included some references to using SMC and CMC diopters on the same lens and the CMC-1 lens was slightly more powerful than SMC-1. The CMC was designed around compacts which tend to have shorter focal lengths so need more power to achieve similar magnifications. I expect this is why Nauticam recommends the CMC-1 with the 28-60. I'm sure the SMC-1 would work, just giving slightly less magnification than the CMC-1. The port chart shows that you get 0.9x magnification but the working distance is between 55-80mm. This means it won't focus except in that very narrow band. I expect it could be a little frustrating to use compared to a proper macro lens. If you are talking about a s35 sensor, assume you are shooting video - I imagine it could be tough to position the rig particularly if you are using a tripod for macro video. You would actually get 1:1 with the 90mm so would be filling the frame with a subject about 25mm across - so I would be asking the question if you need that sort of magnification before deciding what you want to do, which of course depends on what subjects you have in mind. That's more magnification than you would get with the 28-60/CMC combo. The 90mm on an s35 is equivalent to a 135mm lens so you may be needing to back off to far with larger subjects.

You can also do this in your file manager if you name your processed images with species or area or whatever fits best and you can utilise the directory structure to keep it in some sort of order. Searching that is also quite fast, though for Windows users the MS file explorer can be present problems (like the green ribbon of death) so I use Directory opus a third party file management software. I can search from the every top of directory tree to find the file I want. If an image is properly named I can find it no time at all. Going back to the Raw file takes a little longer - I store these by date and area and using the EXIF data I can get back to the Raw images pretty quickly as well. The advantage of this system is it is transparent - not all tied up in a proprietary format. I store all my processed files as a full size layered tiff so it's easy to go back and tweak the editing.