Teleconverters

[kiwi]

Kenko 1.4 Pro DG works great on the 70-200, I have that combo

Not much point showing pics here as the iq on a posted photo will not show you anything

[joeyvaldezjr]

@kiwi, thanks and I agree. I've also read lots of good reviews with the 1.4x but i think the the extra range it gives is too small. I'm actually leaning towards a 1.7x or 2x.

[kiwi]

what are you going to use it for (in general) ?

Adding 40% is quite a lot really (a 1.4 TC) esp if you have a crop camera as well

[joeyvaldezjr]

planning to use it's birds. And by the way, it is possible to shoot macro-like shots with a tc?

[maccaroneski]

Irrespective of whether you can tell and mainly because I love posting this shot (D90 + Kenko Pro 300 DG + 70-200 2.8 VRII at f4):

[kiwi]

planning to use it's birds. And by the way, it is possible to shoot macro-like shots with a tc?

If you want birds you want maximum length

I think the 2x TC is the go

No, will not really help with macros.

Kenko Extension tubes will though.

[maccaroneski]

Wouldn't extension tubes and a TC for the purposes of macro kind of have opposite effects? i.e. tubes would allow you a closer focussing distance (and thus increase magnification) while a TC would allow you a greater focussing distance whilst retaining the same magnification? If that even makes sense?

I'll have to give it a go with the TC and see what happens.

[kiwi]

All a TC does is change the effective focal length and minimum apperture - Ill have to think about whether it effects the minimum focus distance ? hmmmmm ?

The extension tubes allow you to focus closer, they do not magnify the image per se

In combination they would work too...hmmmm....depending on the answer to point #1

[maccaroneski]

The extension tubes allow you to focus closer, they do not magnify the image per se

It wasn't so much the focusing distances that I was getting at, it was more the effect.

With tubes you can get a larger image onto your sensor by moving in closer (?)

Leaving aside the issue of focusing distance with the TC am I right in (assuming) that from the same physical distance (i.e. between tog and subject) you would get a larger image size on your sensor, and then by extension, you can stand further away from your subject whilst getting the same image size on your sensor than without the TC?

Basically was just wondering whether I should bother with trying the TC on the macro lens - the one time that I thought it might come in useful is having the ability to not have to get so close to a dangerous subject like a wasp or spider, yet get an equivalent image size than without the TC.

[kiwi]

Yes, Ive seen it used that way for that reason

[Mircula]

All teleconverters degrade image quality somewhat... as well as dropping your aperture. Given that in most circumstances you'll get as good results simply by cropping a wider image.

So why does the TC degrade IQ and does it depend on the lens how much it degrades it?
How come it has an affect on the aperture as well and is that lens dependent?

Would it be possible to mount a TC on a normal zoom lens as the 28-105 for instance?

Cheers,

Mirc

[kiwi]

So why does the TC degrade IQ and does it depend on the lens how much it degrades it?

>> because you are putting an additional few layers of glass between the lens and camera, so, like any filter, some degradation depending on the optical quality of the glass and TC is inevitable. The only question is by how much.

How come it has an affect on the aperture as well and is that lens dependent?

>> Because each layer of glass takes light...it's not lens dependent is TC dependent, eg 1.4 TC takes one stop, 2x TX takes two stops etc

Would it be possible to mount a TC on a normal zoom lens as the 28-105 for instance?

>> Sometimes - refer to chart as above although unless your lens is f/4 or faster typically dont bother

[RRRoger]

right, not familiar with a 1.5TC

There is a Nikon chart that shows all the compatibility

http://blog.nikonians.org/archives/N...er%20Table.pdf

Kenko has just discontinued both versions 1.5x teleconverters.
If you can find one (not SHQ), the good one the MC DG has more than doubled in price.

[R1titan]

Wouldn't extension tubes and a TC for the purposes of macro kind of have opposite effects? i.e. tubes would allow you a closer focussing distance (and thus increase magnification) while a TC would allow you a greater focussing distance whilst retaining the same magnification? If that even makes sense?

I'll have to give it a go with the TC and see what happens.

Adding a TC will increase the replication ratio by the equivalent amount, 2x TC = 2x magnification, the mfd will not change.

Would it be possible to mount a TC on a normal zoom lens as the 28-105 for instance?

Cheers,
Mirc

Depends on which TC you use. The Canon ones will not work on such a lens, they are only compatible with Canon primes in excess of 135mm, or zooms from 70-200mm on. It will mount but you will lose the ability to AF and read aperture.

For the 28-105 lens, Kenko Pro DG TCs will work and report aperture, however that lens is not optimised for speed and the resulting aperture may be too slow for your given body to AF.

[mongo]

Joey,
Look in “Nikon” and in “lenses” on this forum and see Sar Nop’s thread dealing with 600mm lens plus many different converters (including Kenko and Nikon) and also his thread on 70-200VR with 20EIII converter

[joeyvaldezjr]

Thanks mongo! I'll try and search for that

[BUGSnBIRDS]

WOW, disappear to buy a nice Nikkor lens and come back to find some real handy replies to my question...excellent and thanks. Sure looks like the TC 20III could be worth pursuing for my new 70-200.

Was informed by a couple of salespeople that Kenko won't work with the Nikkor lens but not entirely sure there wasn't some confusion with terminology around extension tubes and teleconverters.

Think the TC 20 III will be added to the wish-list.

[maccaroneski]

Was informed by a couple of salespeople that Kenko won't work with the Nikkor lens but not entirely sure there wasn't some confusion with terminology around extension tubes and teleconverters.

Think the TC 20 III will be added to the wish-list.

No problem at all with my Kenko and 70-200. At $189, i thought I would pick it up and keep the TC20III on the wishlist too

[Dylan & Marianne]

Just got my 2X canon one this week - going to test it out on long landscapes tripod mounted today on some waterfalls. will let you know how it goes