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06-08-2012, 07:58 AM   #1
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DA55-300 with Vivitar 2x

I am looking to purchase the DA 55-300 for an all round travel lens to supplement my wide-angle and 50mm lenses. I found a Vivitar 2x teleconverter also. But one says it is specific to the 55-300 at Amazon and B&H has two telecoverter, a 4 element and a 7 element.

I will be traveling for three and the size and weight of the lens is good. The forum rates the Pentax 55-300 higher than either the Sigma or the Tamron 70-300 so I am liking the lens.

Would anyone know if the teleconverter shown is specific to the lens? Is it even necessary?jlh

Amazon.com: Pentax SMCP-DA 55-300mm f/4-5.8 ED 2x Teleconverter (4 Elements) + Nwv Direct Microfiber Cleaning Cloth.: Everything Else

Thanks,

jlh

06-08-2012, 08:13 AM   #2
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Don't bother. It won't autofocus at anything longer than 200mm and will reduce picture quality. It's better to shoot at 300mm and crop, unless you wan't to make large prints, then it is better to invest in a Bigma.
06-08-2012, 08:17 AM   #3
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IMHO, I'd say it's simply an incorrect product name on the Amazon link. For a T/C to be "specific" to the DA 55-300 it would be manufactured by Pentax.

Secondly, it may "work" with the lens buy I'm unsure. If you plan on using a 2x T/C with the 55- 300 I hope you plan on taking a tripod along.
06-08-2012, 08:35 AM   #4
jlh
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Thanks for the quick responses - after some additional research I'm concerned about the 2x at the low end 55-70mm and possible lens damage and will pass on the teleconverter. I have an older 2x that I used with my MX and fixed 200mm that could work in manual focus. I have tried it with a couple of older kit lens and it works but I have been told that using the 2X on anything less that 100mm is a bad idea. SInce I will be on foot for three weeks and I plan to leave my bigma Sigma at home. I can work with the 300mm for architectural details in conjunction with a 10-24mm and maybe 105mm Macro.

BTW do you all use the DA 55-300?

06-08-2012, 08:39 AM   #5
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QuoteOriginally posted by jlh Quote
BTW do you all use the DA 55-300?
Of course. They can take mine when they pry it from my cold dead hands.

Samples from the 55-300...

https://www.pentaxforums.com/forums/lens-sample-photo-archive/153150-pentax-d...d-samples.html

Most of my PPG pics were taken with it.

BTW. I've never heard of any problems with shorter lenses with most tele-converters. Only with tele-converters like the L series Rear Converters...

Rear Converter-A 2x-L Reviews - Pentax K-mount Teleconverters and Adapters - Pentax Lens Reviews & Lens Database
06-08-2012, 08:43 AM   #6
jlh
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Thanks for the info. I'm going to pull the trigger on the Pentax lens. I was intrigued by the Sigma 70-300 Macro but the photo link you sent sold me on the Pentax.
06-08-2012, 08:47 AM   #7
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DA 55-300 is an excellent lens, for the price. But it is slow as are most consumer zooms. When using tele-converters you lose light, 2 stops with 2x TC. And since most lenses have trouble with AF when the widest aperture is smaller than f/5.6 or so using one on the 55-300 would be frustrating. You might be able to get a 1.4x or 1.5x to work although I have never tried it.

Best results with TCs are with fixed f/4 or f/2.8 lenses.

There is no dedicated TC for that lens, that has to be a miss-print. Sigma makes dedicated TCs for some of it's lenses, what this means is that the optics and placement of elements are matched to that lens. But that TC might not work well or at all on some other lens. They have a list of lenses that they will work with and many that do not.

As already noted, don't bother with a TC on that lens just crop to what you want.
QuoteQuote:
Of course. They can take mine when they pry it from my cold dead hands.
+1 now if only they made WR version...
06-08-2012, 12:04 PM   #8
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QuoteOriginally posted by boriscleto Quote
Of course. They can take mine when they pry it from my cold dead hands.
But you're in no rush, eh?

06-08-2012, 12:31 PM   #9
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QuoteOriginally posted by RioRico Quote
But you're in no rush, eh?
Like Jatrax, I would give it up for a WR version
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