I'm only going off the settings on my K20, They may not be the same on the 100D. But if you have reset the default and still not having any luck, It wont be a settings problem.

Theres a small lever on the front of the camera which says AFS, AFC and MF Make sure its set to AFS

A few more shots taken on the DS with a bellows and super Tak 1.8

[IMG]http://i184.photobucket.com/albums/x261/ClarkyinAus/IMGP0930.jpg[/IMG]

[IMG]http://i184.photobucket.com/albums/x261/ClarkyinAus/IMGP0916.jpg[/IMG]

[IMG]http://i184.photobucket.com/albums/x261/ClarkyinAus/IMGP0897.jpg[/IMG]

This spider was taken on the K20 with a D-FA 100mm, The cat brought it into the kitchen and was playing with it.
[IMG]http://i184.photobucket.com/albums/x261/ClarkyinAus/IMGP5702.jpg[/IMG]

Hi and welcome to the forum.

Firstly, the obvious question, has the camera been set to auto focus and not inadvertently been bumped into manual :

There is also a setting in the custom settings to disable the AF function when you half press the shutter button, have you made any settings changes recently. :

Cleaning your sensor sounds like you need a rocket blower and give it a good blow. Avoid touching the sensor at all costs unless you know what you are doing and have the right equipment to do it. Its an easy procedure if you have a blower and generally it will clean it without any problems.

They are difficult to capture, I just focused the camera on a particular spot where they were tracking and waited for one of them to stop moving

Not 100% sure Mike : I would expect it would have the same manual controls as the 200T but would be considerably heavier and more powerful.

Heres a couple of shots of my latest rig.
The bellows is an old Novaflex I picked up for a buck, it had its camera mount missing so I converted it to a K mount.

[IMG]http://i184.photobucket.com/albums/x261/ClarkyinAus/DSmacrokit.jpg[/IMG]
[IMG]http://i184.photobucket.com/albums/x261/ClarkyinAus/DSmacrokit2.jpg[/IMG]

Yep i'm afraid so.
Bit of a pain i would think.

It would be better suited to my DS I'll give you my address

Try it and see how it goes, it may be ok

From what I have read about it, its TTL dedicated with no manual control, so all the control will have to be done by the camera as it will fully discharge each time.

Let us know how you go with it.

Thanks Guys,
Dan I noticed the sensor, its filthy and i'm on it
These little guys were so tiny I doubt you would feel a bite from one.

Its a nifty setup the DS with bellows and Flash bracket, feels very balanced in the hands. I will post a pic of it later.

I don't think he had been drinking but was giving me a warning to stand clear.

Get yourself an AF200T flash, it a great flash to use manualy, it can be wound down as low as 1/8 discharge and with a diffuser its perfect.

I think dodge is selling one in classifieds.

Nice shots Mike, are you working your way in closer to them

BTW aren't these Hornets :

No worries, let me know how you get on.