What teleconverter works with this lens? Thanks!

The simple answer is - no. There is no teleconverter designed, recommended for this lens. In fact, Panasonic and Olympus make no teleconverters that screw onto the fronts of their lenses. They only make one that fits between lens and camera, which works only with the Olympus 300/4 Pro and ED 40-150mm f/2.8 PRO lenses. The big reason they don't is that the IS, whether optical or in body, needs to know the focal length of the lens and the distance of the subject. When you screw an auxiliary lens onto a primary lens, the lens and/or camera body don't know that it's there, let alone what effect it's having on effective focal length. Some cameras with fixed lenses have had teleconverter lenses specifically designed for them. Canon did a series for their G series and A6xx series cameras. But to use them properly, one had to go in to the menus and tell the camera what converter lens was mounted. A second problem with converters on the front is that the results are generally not really high quality. Just for fun, I mounted a Canon TC-DC58n 1.75x teleconverter lens meant for A600 series cameras, which happens to have a 58 mm thread, on this 14-140 lens. At 140 mm, a shot taken without converter and upsized is considerable sharper, revealing more detail, than a shot taken with the converter. My recommendation is that you give up the idea of a teleconverter. If you need more reach, and have either an Oly body or one of the Pannys with IBIS, the Oly 75-300 is a good lens at reasonable price. The Panasonic/Leica 100-400 is an excellent lens, but large and expensive. The Oly 300/4 Pro is a spectacularly good lens - and even larger and more expensive.

What is the difference between the h-fs14140 and the h-fs14140ak?

The same…the newer is offered in Black and Silver (ak) model.

My zoom action is really stiff and jerky. I have the 12-35 and the zoom is silky smooth. Anyone have this issue?

I can’t be that specific in that I sold the 14-140 a while ago. However the bottom line is that you can’t compare the “pro” level lens (12-35mm 2.8) with a very basic 14-140mm. Everything about these two lens are totally different; image quality, build quality and handling (including zoom action)

How is sharpness/color compared to Panasonic 12-60 f3.5-5.6 within the overlapping range?

Excellent sharpness and color. You get great video and photos with this prime. I personally prefer the 25 1.7 over the 12-60. It is on my camera the majority of the time. You will not be disappointed with this lens. I highly recommend it. And with the price it’s worth adding to your lens arsenal.

ASIN	B0153WGIW8
Best Sellers Rank	#409 in Mirrorless Camera Lenses
Customer Reviews	4.6 4.6 out of 5 stars (29)
Date First Available	October 16, 2015
Is Discontinued By Manufacturer	No
Item Weight	9.3 ounces
Item model number	H-FS14140AK
Manufacturer	Panasonic
Product Dimensions	4.02 x 4.02 x 4.84 inches

PANASONIC LUMIX G VARIO LENS, 14-140MM, F3.5-5.6 ASPH., MIRRORLESS MICRO FOUR THIRDS, POWER OPTICAL I.S., H-FS14140AK (USA BLACK)

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