[Schraubstock]

It would be interesting to see images from someone using it on a less than a DA* lens though

Hi

I really only use the Pentax 1.7 TC with the DA* 60-250, and I never considered using the TC with any of my other glass and I don't really know why.

You prompted me to stick my favorite lens, the Tamron 24-135 AD 1:3.5-5.6 onto that PENTAX TC and I took some shots both under exactly identical conditions.
The following two shots are converted in ACR with no PP other than an identical colour correction, converted to JPG and after downsizing I have applied identical low sharpening prior to uploading as I always do.

I had no idea the Tammy would work so well and I think I will use the TC with this lens more often now. (I thank you for making me do it.) Focusing with the TC/Tammy combo I find is absolutely no problem in either AF or M focus. (On either lens) In M focus the KatzEye even at F8 or 9.5 is still very usable if you know how to shift your eye ball over the VF. And the TC in AF with both lenses also no problem.

Greetings

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Last edited by Schraubstock; 02-16-2013 at 01:48 AM.

[Schraubstock]

100% Crop of the above images

[Lowell Goudge]

posted elsewhere but relevant here too.

K300F4 and 1.7x AF TC at 1/60th shutter

[normhead]

A few more from today.

[komit]

Shot with Pentax K-r + Pentacon 300 mm f/4 + Pentax-F 1.7x AF:

f/5.6?, 1/500 s, ISO 400

[Lowell Goudge]

Shot with Pentax K-r + Pentacon 300 mm f/4 + Pentax-F 1.7x AF:

f/5.6?, 1/500 s, ISO 400

although you use a different 300/4 than I do, this is about the best use for this TC. a 510mmF6.9 lens that is AF (within focus range) and light enough to hand hold at low shutter speeds.

[Ex Finn.]

Shot with Pentax K-r + Pentacon 300 mm f/4 + Pentax-F 1.7x AF:

f/5.6?, 1/500 s, ISO 400

Se toimii aika hyvin, I need to investigate getting one.

[dadipentak]

We have a member that uses a 1.4xS frequently and feels it in the same class as the xL. Maybe if you prod "dadipentak" you can get a review out of him. Sorry dadi....

[wakes up, wipes drool and rubs eyes] Uh...wha...no, there must be some mistake: I only recently acquired an A 1.4x-S and I'm not ready to pronounce a verdict on it. I am, however, prepared to enthuse about the DA*300/4 + AF 1.7x TC combo. I no longer have the lens but I was very pleased with the results I got (given good light.)

Case in point:

[snostorm]

I'll play -- I have used an F 1.7x AFA more often than not since I obtained my first one over 6 years ago. I currently have 3. One is taped for use with my Sigma EX 180 f3.5 Macro, a second is taped for use with my Sigma EX 300 f2.8, and the third is stock for use with Tamron and Pentax lenses. Sigma lenses don't transmit proper aperture information with the AFA, so contacts have to be insulated to get close to accurate aperture info for the exif. I've had 4 of these over the years, and never paid more than $200 for one. The prices they're commanding the past few years are pretty amazing, but it's a pretty uniquely useful piece of kit.

I first started using it with an A* 300 f4 and the DS exclusively handheld.


When I obtained a Tamron SP 300 f2.8, it was a natural addition. This shot was handheld, leaning against my car, with the DS, so no SR


I was amazed at the detail I was able to capture -- (luck had something to do with it) Here's a 100% crop from this shot near the center straight OOC


I always try to push my gear to see what it will do, and had to try the SP 300 with the SP 140F 1.4x Adaptall TC and the 1.7x AFA and the K20. 714mm really needs a tripod. This is about a 1/2 frame crop.


I now use it mostly with the FA* 300 f4.5 handheld. This is a crop from a handheld shot with the K-7


The best results I've gotten have been with the FA* 300 f2.8. This was shot from a tripod with this lens and the AFA. It's a full height vertical crop from a landscape frame.


Outstanding results can be gotten with the FA* 300 f2.8 with stacked TCs. This one is with the K20, this lens + a Sigma EX 1.4x APO TC + the 1.7x AFA (714mm f6.7 max). A full height vertical crop from a landscape shot.


Here's a 100% crop from about 1/2 way down from the center of the frame straight OOC.


Scott

[jpzk]

[wakes up, wipes drool and rubs eyes] Uh...wha...no, there must be some mistake: I only recently acquired an A 1.4x-S and I'm not ready to pronounce a verdict on it. I am, however, prepared to enthuse about the DA*300/4 + AF 1.7x TC combo. I no longer have the lens but I was very pleased with the results I got (given good light.)

Case in point:

That is one GREAT "case in point" !!
Very sharp, almost like you didn't have a TC on that lens.

Which brings me to this: no way I could EVER get this sort of IQ with my own combo (same as yours actually).
Someone from another thread suggested to have the lens - TC sent to Pentax for calibrating the helicoidal mechanism of the TC so that I would never have to make any adjustments .... I haven't sent it.

So, it seems that the success of this TC with any given lens is a matter of "luck" (so to speak).
I see great shots here, using the TC with different lenses, at different distances: not all are great IQ.
It also seems that, most of the time, users have more "keepers" of closer subjects thank those at a distance.

However, for me, this K5 + DA*300/4 + the 1.7X TC simply doesn't cut it. ... reason why I am waiting for this 560mm to show up; if it doesn't, I'll go the Sigma way.

JP

[imtheguy]

[wakes up, wipes drool and rubs eyes] Uh...wha...no, there must be some mistake: I only recently acquired an A 1.4x-S and I'm not ready to pronounce a verdict on it. I am, however, prepared to enthuse about the DA*300/4 + AF 1.7x TC combo. I no longer have the lens but I was very pleased with the results I got (given good light.)

Case in point:

GASP! You SOLD your da*300?? Very sad. I had no idea times were that tough. May I presume at least one kidney went first?

[dadipentak]

GASP! You SOLD your da*300?? Very sad

It was part of my cunning plan to fund the Sigma 500/4.5.

[imtheguy]

It was part of my cunning plan to fund the Sigma 500/4.5.

You da man DadiP. In that case I hope you had a whole box of da*300 to make a dent in the well advertised $4999. Maybe you got a new Sigma 1.4x tc too?

[dadipentak]

You da man DadiP. In that case I hope you had a whole box of da*300 to make a dent in the well advertised $4999.

Yeah, but I had to break up the six-pack and sell them as singles ;~)

Maybe you got a new Sigma 1.4x tc too?

Of course I did and it's a good combination but sometimes I'd rather use catch-in-focus and that's why I picked up the A 1.4x-S.

[PushTheRedButton]

Maybe I missed this, but will this work for Sigma's 70-200 f/2.8? I've heard issues with the AF not working with a TC.