Board index ‹ Photography ‹ Technical Questions ‹ Extension tubes for nikkor 200 mf
prinothcat wrote:I will toss this out, and someone will correct or refine it... Extension tubes will increase the magnification, shorten the depth of field, narrow the field of vision. This should allow one to work smaller objects, and better highlight the subject. Be aware that they will also drop the aperture rating slowing the exposure. They will probably require the use of off camera lighting or a ring light, because they will move the subject closer to the lens potentially casting unwanted shadows and blocking light from a shoe flash..... They are generally just hollow tubes, with no glass elements or controls. If your lens was AF instead of MF they would need AF couplings and would cost more. On that note make sure they have aperture control linkages... They may be intended for a completely manual lens set up.
I have no frame of reference as to the price, but seems to me if they are affordable, why not pick em up and play around with them?
jimcritchley wrote:Cheers for the info. With regards to art, the lens is a true macro which focuses down to 70cms. Would you guys buy one yourself or just stick using the 200mm on its own?
dang wrote:One alleberation on prinothcat, adding tubes doesn't cut the field of view. Even though you'll get closer, the background area is unaffected. If for example, the lens has a field of view of 24 degrees, it remains 24 degrees with extension (unless I've forgotten something).
dang wrote:..you're correct that it has an effect on dof. The higher your magnification, the lesser your dof. A simple rule anyone shooting macro learns quickly, if they weren't aware. It's also good to note that lenses f/stops are rated at infinity, but the "effective f/stop" can be several stops slower when focused for macro, even without tubes. It's not a big deal when metering through the lens, but if using a hand held meter, correction for exposure must be added in.
Thanks, enjoyable discussion.
Board index ‹ Photography ‹ Technical Questions ‹ Extension tubes for nikkor 200 mf
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