Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-10-2013, 11:12 AM   #1
New Member
pentaxian999's Avatar

Join Date: Jun 2011
Posts: 12
50mm f/1.7 with 1.5x TELE CONVERSION LENS means a 75mm f/2-ish portrait lens?

Have anyone ever tried pairing a 50mm lens with a TELE-CONVERSION lens, the ones used in-front of lenses, such as in Prosumers/Superzooms? I know that IQ will degrade, I also know that mostly are junk, but according to reviews it seems there are some tele-conversion lenses that actually performs very well out there.

02-10-2013, 11:46 AM   #2
Senior Member
LeGuillotine's Avatar

Join Date: Jun 2009
Location: Finland, Kotka
Photos: Gallery | Albums
Posts: 169
QuoteOriginally posted by pentaxian999 Quote
Have anyone ever tried pairing a 50mm lens with a TELE-CONVERSION lens, the ones used in-front of lenses, such as in Prosumers/Superzooms? I know that IQ will degrade, I also know that mostly are junk, but according to reviews it seems there are some tele-conversion lenses that actually performs very well out there.
Hi

I haven't ever tested ane of those, only some cheap 2x teleconverter, thats not good.
Why You want to do it? Better to buy some inexpensive 70 -135 lens that You can use for portraits?


LeGu
02-10-2013, 11:51 AM   #3
Veteran Member
Lloydy's Avatar

Join Date: Aug 2007
Location: Shropshire, UK
Posts: 1,114
I only ever tried one, which came with a bunch of Canon film stuff and I tried it on my AE1p with the 50 / 1.4 with some Fujicolor. Never again......it was a horror! But you've got to try these things. I use it as a magnifying glass in my workshop now, and it's ok for that.

Diopters for macro are another thing, and some of those are good and useful. But I'd forget the front mounted teleconverters, there are good cheap lenses out there that are far better value for money.
02-10-2013, 12:06 PM   #4
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,287
QuoteOriginally posted by pentaxian999 Quote
I also know that mostly are junk,
So you already know all you need to know.

Don't waste your money. Most of them go for $15 - $30usd and for twice that you can get a decent off brand lens that will give the same range and better IQ.

02-10-2013, 12:50 PM   #5
Pentaxian




Join Date: Mar 2010
Location: Frankfurt am Main
Posts: 1,045
RioRico repeatedly praised the SONY VCL-1546A (x1.5) as nearly not degrading IQ at all, if used with a decent normal or tele lens. He seemed to be specially fond of the paper thin DOF, if paired with his 1.2/50.

Because of his advice, I looked for it on German eBay, and after several weeks I got one in mint condition, not too expensive. I forgot how much I payed, but here at auctions you will pay €20 - €40 for used ones.

I haven't done pixel peeping yet (and maybe I won't do it), but my impression from some real life shots is that IQ is quite ok. But it is not small (77mm filter thread), and a lens hood should always be used.

Edit:
Also, your assumption that you'll get a F2/ 75mm would be correct with a TC between lens and body. With front tele converters (if their front lens is big enough like with the SONY mentioned), the F stop doesn't change. You'll get a F1.7 / 75mm combination, but VERY thin DOF.
The bad reputation of front tele converters is because many of them were designed for use with camcorders. These are known for lower resolution, very small sensors, and lots of distortion anyway. But it seems the Sony was designed for the use with DSLRs.

Edit 2:
I also once tried the SONY VCL-0758A (x0.7). Whereas sharpness seems ok, (barrel) distortion and vignetting make it unusable for a DSLR. This one is really for camcorders and P&S only. But then I tried it with a 24mm on APS-C; maybe with 50mm it would improve. However, I have no need for such a combination, as I own primes with 35, 30, 28, and 24mm, and zooms down to 19 and 18mm.

Last edited by RKKS08; 02-10-2013 at 04:16 PM. Reason: Added information
02-11-2013, 09:39 AM   #6
New Member
pentaxian999's Avatar

Join Date: Jun 2011
Posts: 12
Original Poster
Sony Nex' 16mm f2.8 lens have such 'extension' lenses, and proven very good. So, how thin is the DOF I should expect? At 'normal' f1.7 it's already thin as hair
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
50mm, 50mm f/1.7, k-mount, lens, lenses, pentax lens, slr lens, tele conversion lens, tele-conversion
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: SMC A 35mm f/2.0 (Rare!), DA 40mm Ltd, Tamron 17-50mm f/2.8, SMC A 50mm f/1.7 leadfoot Sold Items 5 02-18-2012 12:19 AM
For Sale - Sold: Pentax 50mm Lenses: M-F/1.7 and F/2, A-F/1.7, and a Chinon 1.9 (Worldwide) unixrevolution Sold Items 18 05-25-2011 01:06 PM
For Sale - Sold: Lenses with issues: Sigma 20-40mm f/2.8 and Pentax-A 50mm f/1.7 (CONUS) cas Sold Items 5 03-01-2011 10:23 AM
For Sale - Sold: PZ-1 SE; Pentax-A 50mm f/1.7 lens and 50mm f/2; K1000 SE (Worldwide) Nick Siebers Sold Items 8 11-20-2010 08:51 PM
For Sale - Sold: 3 Manual Primes: A-28mm f/2.8, A-50mm f/1.7, and M-50mm f/1.4 (US) Rich_A Sold Items 6 03-24-2010 02:25 PM



All times are GMT -7. The time now is 03:20 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top