Originally posted by Shuggzi Ah extension tubes, tell me more, what type do i need? I haven't a clue regarding extension tubes
For what ever reason I seem to have had a pretty good experience using that 55mm f/1.8 on extension tubes, as well as reverse mounting a SMC takumar 28mm f/3.5, for macro. In both cases far better than using the 50mm f/1.4 on extension tubes but I think that just may be because of the operator. I have 2 sets of M42 mount extension tubes. One is the auto extension tubes which would engage the aperture button on the rear of those screw mount lenses, and another that doesn't. This isn't a concern as you aren't using a spotmatic which used that feature so you will have to put the lens into manual aperture, focus and compose wide open, and then stop down. Both are Asahi Optical Co. ones are are really well made. I did a quick check and didn't see any for sale in the market place but they are easy enough to find on e-bay and a set is pretty cheap. Expect to spend about $10 for a near perfect set. Here is the
first set I found that has a picture. Since you already have an EOS to M42 adapter you won't have a problem there. If you want to play around some more with macro photography I would also suggest getting an old SMC or Super Takumar 28mm f/3.5 M42 lens and M42 to 49mm filter reversing adapter. I forget what I paid at retail but it wasn't above $20 for the reversing ring and that was only a few months back, but here is
what one looks like that is for sale. For things like these in M42 mount just go with the genuine Asahi or Pentax items as they are inexpensive and the off brand ones are really a mixed bag and you only save a couple of dollars.
From what I have read I believe that the extension tubes have these lengths:
#1 - 9mm
#2 - 19mm
#3 - 28mm
Since you can stack them you get 56mm of extension. Which with the 55mm f/1.8 lens would get you to 1:1 macro. If you only use the 28mm one you are at 1:2, or if you are like me and have 2 sets you can get to 2:1 with a total of 112mm of extension between the lens and body. However at this point you are basically stuffing the lens down what ever you are trying to take a picture of. Also at 1:1 macro doing this you lose 2 stops of light and at 2:1 you lose 4. With the 55mm f/1.8 lens there is a fair amount of focus breathing but the focus ring will change the focal point. If you don't know what focus breathing is it become very clear when doing macro with this lens on extension tubes.
I like the 28mm f/3.5 reverse mounted because that basically gives you a 2:1 macro, but with the extension tubes I can get up to112mm of extension which when used like this basically gives you a 6:1 macro with a ton of light loss. Here
is a shot I took with my K-3 using a SMC Takumar 28mm f/3.5 lens on a reversing ring, on the #1 extension tube. Also with the reversed mounted 28mm you are farther away from the subject and even with the #3 tube thrown into the mix I can illuminate the subject with the on camera flash. One thing you do lose when doing this is that the focus ring on the lens does nothing and to focus you move the camera.
Extension tubes basically allow the lens to focus closer than they normally would which allows them to provide greater magnification. However when using them you do lose the ability to focus to infinity or even at longer distances. At some point the magnification gets into the macro range, hopefully before the end of the lens is touching the object you are photographing. Instead of extension tubes you can also use bellows which provide much finer control and a greater range but do cost more, but not much.
For some more background information you can read the
wikipedia page on macro photography and get some more of the basics.
Originally posted by Shuggzi or to that matter tele converters
I am the wrong person to ask about teleconverters as the one I have was a $5 gamble at the pawn shop years ago. I lost that bet and got probably the worst teleconverter ever made.