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02-10-2011, 08:19 AM   #1
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Which TC for the highest quality on DA*200, DA*300 and/or FA*300

So the question is which TC would be best suited for these three lenses? I understand there is always loss using any TC, but I'm only trying to consider the more highly regarded TC's and these outstanding lenses.

In consideration are the following:

Tamron-F 1.4x PZ AF 4MC
Tamron-F 2x AF TC 7MC

Pentax 1.7x

The other question is would the Sigma TC's work with these lenses? I know these work with a very specific list of Sigma lenses but not sure if they would work with Pentax Brand Lenses. These seem to be a unique pair!!

Sigma 1.4x EX DG F
Sigma 2.0x EX DG F

What have others tried and found to be the best combination?

Any insight, information is greatly appreciated.
Thanks....

02-10-2011, 08:21 AM   #2
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The best TC for DA*200/2.8 should be the A1.4X-L & A2X-L.
02-10-2011, 08:32 AM   #3
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I use the Pentax AF1.7X with my DA*200 and my DA*300 and I am very impressed with the results.
02-10-2011, 08:47 AM   #4
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The only one I have any experience with is the Pentax 1.7x on the DA*300. Works very well with that lens (but you must get the focus close manually first). From what I've read, the Sigma TCs don't play well with the DA* lenses. They work great for the lenses they are intended for (Sigma) however (from what I've read).



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02-10-2011, 02:31 PM   #5
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Note sigma TCs protrude into the bac of the lens and require a clear opening 12 mm deep 35 mm in diameter in the rear of the lens. This typically applies to sigma lenses, both zooms and primes that are telephoto only and have large front elements as well I.e. Starting at 77mm

Also note that at this point unless sigma has done a very quiet release their tcs don't support hsm
02-10-2011, 03:21 PM   #6
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Why not just crop the image to get the same magnification?
02-10-2011, 03:29 PM   #7
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Depending on the lens and the TC a TC is better

I use the sigma 70-200f2.8 EX non GD non macro with both the 1.4x & 2x TCs. They are excellent and a full frame on my K7 as opposed to cropping down to half size (1/4 the pixel count) can be significant in terms of loss of IQ
02-10-2011, 03:45 PM   #8
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QuoteOriginally posted by Lowell Goudge Quote
Depending on the lens and the TC a TC is better
I suppose if the lens outresolves the sensor by more than the magnification of the TC, TC is better. The corollary is dont use TCs on low resolution lenses, crop instead.

02-10-2011, 08:26 PM   #9
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QuoteOriginally posted by wlachan Quote
The best TC for DA*200/2.8 should be the A1.4X-L & A2X-L.

Not familiar with either of these I will to review both of them...thanks
02-10-2011, 08:28 PM   #10
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QuoteOriginally posted by JeffJS Quote
The only one I have any experience with is the Pentax 1.7x on the DA*300. Works very well with that lens (but you must get the focus close manually first). From what I've read, the Sigma TCs don't play well with the DA* lenses. They work great for the lenses they are intended for (Sigma) however (from what I've read).



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Thanks Jeff...I kinda of figured the 1.7x was a good choice but the tamron are pretty highly regarded in the database. I didn't really figure the Sigma's would play with Pentax...heck they don't play with that many sigma lenses.
02-10-2011, 08:29 PM   #11
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QuoteOriginally posted by Lowell Goudge Quote
Depending on the lens and the TC a TC is better

I use the sigma 70-200f2.8 EX non GD non macro with both the 1.4x & 2x TCs. They are excellent and a full frame on my K7 as opposed to cropping down to half size (1/4 the pixel count) can be significant in terms of loss of IQ

Lowell are you using the Sigma's with this lens or another brand?
02-10-2011, 08:37 PM   #12
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QuoteOriginally posted by stl09 Quote
Thanks Jeff...I kinda of figured the 1.7x was a good choice but the tamron are pretty highly regarded in the database. I didn't really figure the Sigma's would play with Pentax...heck they don't play with that many sigma lenses.
Sorry, I somehow missed the Tamron 2x on your list. Yes, it's decent and no where near as expensive as the F1.7x adapter (technically that's what it is). My memory is a little foggy on it but my copy seemed Finicky with the SDM lenses. The first time I tried it with one, the aperture wouldn't stop down so it would only shoot wide open. I thought I had sold it (but didn't) and later tried it with my 300 and it seemed to work. The tamron is buried in a box somewhere but if I can find it, I'll check it out with my lenses and see what's what.

02-12-2011, 07:33 PM   #13
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I have the DA*300 f4 and the Sigma 100-300 f4 and have TCs for both. The reason the latter lens is important is that it is where I have experience with the Sigma TCs. The Sigma TCs do not work on HSM lenses. To get a TC to work on the HSM lenses, you need the Pz version from various manufacturers. The Pz versions have the HSM/Power-zoom contacts, and to my knowledge can only be found second hand. (I have no knowledge about the Pentax TC in this context.) Non-HSM TCs can be found at many stores.

By the way, my experience with the Sigma TCs on the 100-300 f4 was that the 1.4x is weak structurally in that it could not handle constant use with the weight of lens and camera attached. Great optically, but poor structurally. The failure starts with electrical contact drop-outs then the case slowly eases apart and no amount of tightening the screws will stop it. I have had two of them fall to pieces and now use a Kenko 1.5x on that lens. My extensive experience with the Kenko TC on the DA*300 is that I have had no problems and that is using the TC as a permanent addition to the DA*300 for a few years now.

The Pz TCs that I have for HSM lenses are:
- "Kenko 1.5x Teleplus SHQ" which as far as I can determine is exactly the same as the next on the list:
- "Tamron-F AF Teleconverter 1.4x Pz-AF MC4" (which I also own)
- "Promaster Spectrum 1.7x Teleconverter for Pentax Z AF"
- "Pro Cambron 2X MC7 Tele-Converter Pz/AF" which I understand to be very similar, if not identical, to the Tamron version. I have played with a friend's Tamron version and couldn't identify any differences.

Optically, I have found the best results using the 1.5x Kenko or Tamron. The higher power TCs tend to be a bit (or even a lot) less sharp unless the DA*300 is stopped down to about f6.3. I can get superb results with the 1.5x at f4, but I usually just stop to f4.5 unless the light is really low. So, the 1.5x lives on the DA*300 and I only remove it if light is really low, or if I am too close to the subject for the TC.

However, once you put a TC on, the autofocus is not as flash as it could be. It takes bright light for my K5 to focus the DA*300 with the 1.5x TC on it. However, the way I generally shoot is to use 'catch in focus', AF.S and to turn the focusing motor off in the lens. This achieves great results because it controls the focus range and stops the focus from running away to somewhere else (important with moving targets or hand held shots), and avoids hunting. This really works, and gives great results and it works in light so low that the focus engine gives in when using automatic modes.

I hope this helps.
02-13-2011, 02:23 AM   #14
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QuoteOriginally posted by wlachan Quote
The best TC for DA*200/2.8 should be the A1.4X-L & A2X-L.
Warning : I own both and they are not compatible with the DA*200 nor with the DA*300; the protubting element is the reason; they was designed for A*300 f2.8, A*400 f2.8, A*600 f5.6, and are compatible only with large, fast tele lenses like FA*300 f2.8 and FA*600f4
Regards
02-13-2011, 02:58 AM   #15
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The L should be compatible with the FA/DA*200/2.8 but not DA*300/4.

http://www.pentax.jp/japan/products/lens/index35_morelong.html
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