Showing posts with label teleconverter. Show all posts
Showing posts with label teleconverter. Show all posts

Saturday, January 23, 2010

Macro Photography Techniques - Part 6 - The End

This is the 6th and final post in the macro photography techniques thread. Once I get some more results with my external flash macro shots I will add flash information to the series.

Macro Photography Techniques
  1. Close Focus Lens
  2. Teleconverters
  3. Extension Tubes
  4. Reversed Lenses
  5. Macro Lens
  6. Combining Techniques
  7. Close Up Filters
How Do You Combine?

When I say combining techniques, I'm referring to a few options, I will give each a small write up.

Teleconverters and Reversed Lenses

This is a method I only tried very recently, it gives huge amounts of magnification, very short working distances, but very cool shots are possible. This method involves mounting a teleconverter to your body, then mounting your reversed lens to your teleconverter. You effectively double the magnification you get from the reversed lens setup. The trade offs in this case are, losing 2 stops of light (assuming a 2x teleconverter), short working distance (distance from lens to subject), tiny depth of field and extreme magnification (this makes it hard to frame handheld, as tiny movements result in big shifts in composition). I was put onto this method by this guy. Check out his flickr for some truely amazing macro photography. He combines various techniques involving off camera flash, reversed lenses, teleconverters, bellows, extension tubes and focus stacking.

Extension Tubes or Bellows and Reversed Lenses

This is a similar method to the previous. If you mount your reversed lens onto a set of extension tubes (or bellows), you will increase your magnification. The same trade offs apply as with the previous method, loss of light, shorter working distances, smaller depth of field, and larger magnification. This is not a method I have personally tried, but I know it works as I have seen the results!

Combine The Above

So what about a set of tubes or bellows, then a teleconverter, then a reversed lens? Well imagine the magnification!!!!! But the working distance might become so short, that the subject would actually have to be INSIDE the lens. This is obviously not possible, so take care you aren't going for too much magnification.

What About A Macro Lens?

You can very easily use a macro lens in the above methods, instead of using the reversed lens. Either method (or both) will allow greater than 1:1 magnification for those super close shots.

Would You Believe It?

As I am typing out this post, a baby gecko appeared on my window sill. Naturally (with macro on the mind) I grabbed the camera off the desk, grabbed the 28mm with reverse adapter already mounted from the drawer and took his photo. I will be sure to post the shot when I am able to process it fully. As a side note, I discovered a new little trick. It will work with K mount lenses, but I'm not sure if it will work with others. On the back of the lens is a small lever, this is what the body uses to actuate the aperture for wide open focusing, stop down shooting. If you are careful about how you hold the lens, you are able to actuate this lever with a finger, to give the same effect. The gecko was sitting on a white windowsill, with a very close working distance and onboard flash at full power (it always fires full power with non "A" lenses) I needed to stop all the way down to f22.0. At f22.0 the viewfinder is basically completely black so this little trick allowed me to get the shot I wanted.

Result

Here is a shot I took using a reverse mounted 28mm lens, a 2x teleconverter, and the onboard flash. This insect was less than 10mm long, so you see the huge magnification this combination allows.


ISO 100, probably around f16 aperture, 1/180 sec, onboard flash

The End

Thanks for reading the final post in this series (for now). If there are other methods you would like me to cover then let me know however you can, and I'll get onto it! And don't forget to keep an eye out for some shots of the baby gecko.

Friday, January 8, 2010

Macro Photography Techniques - Part 2

This is the 2nd technique I've used when taking macro photos (also the one I've used the most).

Macro Photography Techniques
  1. Close Focus Lens
  2. Teleconverters
  3. Extension Tubes
  4. Reversed Lenses
  5. Macro Lens
  6. Combining Techniques
  7. Close Up Filters
Teleconverter with a Close Focus Lens

This technique requires a teleconverter. A teleconverter is an accessory which mounts between your camera and your lens. The effect is increase of focal length. In this case you will probably want a 2x Teleconverter, which is designed to double the effective focal length of your lens. However it does not change the minimum focus distance, so you end up with the same lens, focusing at the same distance, but you get twice the magnification of the image. You can also get Macro Focusing Teleconverters (such as this) which have their own focusing ring, and allow extra magnification, and a good level of control over the magnification.

Drawbacks? Of Course...

The downside of this technique is that a 2x teleconverter, while doubling your effective focal length, it also reduces the effective aperture (incoming light) by 2 stops. So if your kit lens happens to be a Pentax SMC DA 18-55mm f3.5-5.6, and you are wanting to get maximum magnification (55mm @ minimum focus distance) adding a 2x teleconverter will mean that the lens (wide open, where it is a bit softer) becomes 110mm at f11.2. So in order to get a fast shutter speed you will need either high ISO (noisy) or a flash. I have had very good success just using the onboard flash though.

A teleconverter will also exaggerate any quality problems in the lens you are using. If you lens is a bit soft, it will be twice as soft using the 2x teleconverter. So you must be cautious about how you use it. This is where using a flash is also helpful, as it allows you to use a smaller aperture, which will mean the lens is going to be closer to its sweet spot for sharpness.

Another obvious drawback is that you need an extra piece of equipment. I was able to acquire an older 2x teleconverter to fit Pentax K mount on ebay for about $15. It has no "A" contacts (for camera autoexposure) or autofocus. Ideally you would want to have the "A" contacts for auto exposure, however, auto focusing is not required for this technique as you will be using manual focus mode set to minimum focus distance anyway.

Focusing

The same method for focusing is used as for the previous technique. You can read up on that here, in Part 1.

Results

Here are a couple of photos taken using this technique, including settings.

SMC F 35-70mm @ 70mm (effective 140mm), f11 (effective f22), 1/180 sec, ISO 200, onboard flash


 SMC F 35-70mm @ 70mm (effective 140mm), f16 (effective f32), 1/20 sec (this should be shorter), ISO 400, onboard flash

SMC F 35-70mm @ 70mm (effective 140mm), f11 (effective f22), 1/180 sec, ISO 200, onboard flash


For those of you who already have teleconverters, why not give this technique a try, and post up the results in the comments.

Tuesday, January 5, 2010

My Photography Gear

This is a full list of all my photography gear, I will try my best to keep it up to date as I buy and sell various things

Camera Body
Pentax Lenses
  • Pentax SMC DA 18-55mm AL II f3.5-5.6
  • Pentax SMC A 50mm f1.7
  • Pentax SMC M 50mm f1.7 (has fungus)
  • Pentax SMC M 28mm f2.8
  • Pentax SMC FA 100-300mm f4.7-5.8
Russian Lenses
  • Mir 1 37mm f2.8 M42 - SOLD
  • Helios 44-2 58mm f2.0 M42 - SOLD
  • Jupiter 9 85mm f2.0 M42
  • Tair 11-A 135mm f2.8 M42
Others
  • Sigma 10-20mm f4.0-5.6 (enroute from ebay!)
  • Tamron 17-50mm f2.8
  • Hanimar 135mm f2.8 M42 (for sale)
  • Soligor 135mm f3.5 M42 (for sale)
  • Vivitar 135mm f3.5 M42 (for sale)
  • Pentacon 30mm f3.5 M42 (for sale)
  • Vivitar 35mm f3.5 M42 (loose rear elements, its my paper weight)
Lens Accessories
  • Quantaray 2x AF Teleconverter (with Powerzoon contacts, may work with SDM - yet to be tested!)
  • Vivitar Auto Teleconverter 2x-22 (allows wide open focusing but has no contacts and no autofocus) (for sale)
  • Vivitar Auto Extension Tubes AT-22 (allows wide open focusing but has no contacts and no autofocus)
  • 49mm Hoya 3 position rubber hood
  • 58mm black metal hood - bought from ebay (for FA 100-300)
  • Lens cleaning brush
  • Lens Cleaning tissues
  • Lens cleaning cloths (lots of these) - 3 packs are available from DealExtreme
  • Giottos Rocket Blower Medium
  • 67mm -> 77mm filter step up ring (allows 77mm filter on a 67mm threaded lens)
Lens Filters
  • 49mm Cokin CPL
  • 49mm UV x3 (came with various lenses)
  • 49mm Blue
  • 49mm Hoya Star Six
  • 49mm Hoya Centre Spot (blurs out the edges, leaving only the centre of the image clear)
  • 52mm Kenko MC CPL
  • 52mm Hoya R72 Infrared
  • 52mm Hoya NDX400 (9 stop ND filter)
  • 52mm IR720 as mentioned here
  • 52mm ND400 as mentioned here
  • 62mm Kenko MC CPL (for sale)
  • 62mm Kenko MC UV (for sale)
  • 67mm Kenko PRO1 Digital Protector
  • 67mm Kenko PRO1 Digital CPL (enroute)
  • 77mm IR720 (enroute)
  • 77mm Kenko MC CPL (enroute)
Cokin P Filters and Accessories
  • Chinese copy 3 slot Cokin P holder
  • 52mm adapter
  • 49mm adapter
  • TianYa ND8 filter
  • TianYa ND8 grad filter (soft graduation)
  • TianYa Sunset (orange grad) filter
Flashes and Accessories
  • Sunpak Auto 200 flash (part of Dad's gear, unsafe for DSLR hot shoe mounting)
  • Optical Trigger
  • Hand made diffuser using cardboard, alfoil and plain white paper
Other Accessories
  • Cable Release Remote - bought from DealExtreme
  • IR Push Button Remote - bought from DealExtreme
  • 3 axis hotshoe mounted bubble level - bought from DealExtreme
  • Pentax D-BG3 battery grip for K200D
Tripod
  • Slik 500 Pro DX w Head