MIssing items


brownargus

Link Posted 10/07/2009 - 16:17
Having developed an excellent range of lenses over the last few years, when is Pentax going to produce necessary lens accessories, i.e. 1.4x/2x converters and extension tubes that work with their lenses, especially those with the SDM focus, such as the 300 DA*?

These items are not available from the independents, such as Sigma and Kenko. Pentax should produce them to complete their range!

John
Pentax K7, Pentax DFA 100 macro, Sigma 17-70 macro, Tamron 70-200 Di LD zoom macro, Vivitar 28 f2.8 CF, Tamron 500 mirror lens, Pentax 360FGZ flash, Panasonic FZ28

Snootchies

Link Posted 10/07/2009 - 16:37
Ditto! Pentax need to release the SDM 1.4TC that was announced way back when at the same time as the 60-250 & 55.
Bob

My website (Hadfield Photography)

Pentax Gallery Artist page:link

Flickr Photostream: link

shim

Link Posted 10/07/2009 - 16:47
Can't see them ever introducing converters, because of the
exposure problems.

shim

Classvino

Link Posted 11/07/2009 - 19:11
shim wrote:
Can't see them ever introducing converters, because of the
exposure problems.

shim

What problems?
--------------
MZ-6,K10D,K20D,Grip,DA*Zooms,DA 18-55-200 Kit,FA50,1.7TC,AFZ360
For Saleentax FA28-90,FA100-300,Sigma EX28-80,DC18-200,
Makinon 500mm Mirror

shim

Link Posted 11/07/2009 - 19:38
Classvino wrote:
shim wrote:
Can't see them ever introducing converters, because of the
exposure problems.

shim

What problems?

I did start a thread about this, but didn't get any answers, so seems that no one knows or they don't have any problems link

I've since bought a Pentax A 2X-S but haven't tried it on that one.

shim

Gwyn

Link Posted 11/07/2009 - 21:36
Plenty of others here seem to use TCs without any problems.

I agree it would be great if Pentax were to put the 1.4 SDM TC back in the scheme of things, sooner rather than later too.

Oggy

Link Posted 11/07/2009 - 21:53
Or maybe a DA*100-400...

Gwyn

Link Posted 11/07/2009 - 22:02
Oggy wrote:
Or maybe a DA*100-400...

With the SDM TC?

Oggy

Link Posted 11/07/2009 - 22:12
Possibly, but not necessarily. If I had to raise a grumble about Pentax, it would be that their lens range stops at 300mm.

(Oh and possibly the K20 body cap )

George Lazarette

Link Posted 11/07/2009 - 22:25
Oggy wrote:
Possibly, but not necessarily. If I had to raise a grumble about Pentax, it would be that their lens range stops at 300mm.

I fear it will stop at 300mm for quite a while. Not many people want more than 300mm, so the cost of such a lens, with it's short production runs, will be very high.

I'd love a 500mm, personally, but I don't think it's going to happen in the near future.

G
Keywords: Charming, polite, and generally agreeable.

Anvh

Link Posted 11/07/2009 - 22:36
George Lazarette wrote:
I fear it will stop at 300mm for quite a while. Not many people want more than 300mm, so the cost of such a lens, with it's short production runs, will be very high.

I'd love a 500mm, personally, but I don't think it's going to happen in the near future.

They have a super-tele on the lens roadmap so who knows

My guess is that it will be a DA*400 f/5.6 most probable.
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Last Edited by Anvh on 11/07/2009 - 22:38

Oggy

Link Posted 11/07/2009 - 22:39
I wonder how many people are put off Pentax because of the 300mm limit.

I want to take pictures of aircraft and wildlife, and in both cases more would be useful.

I find myself with the old dilemma of cropping from the DA* 300mm or trying to get a decent picture out of the Sigma 150-500.

Classvino

Link Posted 15/07/2009 - 15:16
shim wrote:
Classvino wrote:
Quote:
Can't see them ever introducing converters, because of the
exposure problems.

shim

What problems?

I did start a thread about this, but didn't get any answers, so seems that no one knows or they don't have any problems link

I've since bought a Pentax A 2X-S but haven't tried it on that one.

shim

I didn't notice that thread or I might have replied...

I have a Pentax AFA 1.7x TC, and I only lose a stop and a bit, as one would expect, and my 2X Tamron BBAR loses the 2 stops I would expect it to lose... I have no idea why yours should be behaving so differently... Perhaps defective?
--------------
MZ-6,K10D,K20D,Grip,DA*Zooms,DA 18-55-200 Kit,FA50,1.7TC,AFZ360
For Saleentax FA28-90,FA100-300,Sigma EX28-80,DC18-200,
Makinon 500mm Mirror

shim

Link Posted 15/07/2009 - 15:31
It could be the lenses.... unlikely that a K10D and GX-20 would have the same fault. I'm not sure what lens they mean when they say 2X it might only be 2X on a 50mm and 3X on a 300mm which would give a bigger light loss. I'll have to see what I get with a 50mm.

shim

johnriley

Link Posted 15/07/2009 - 15:51
A 1.4x converter multiplies the focal length of any lens by 1.4x and there is a light loss of 1 stop.

A 2x converter multiplies 2x and there is a light loss of 2 stops

A 3x converter etc. with 3x and 3 stops loss.

This will apply to all lenses and if it's not happening then I would look at the communication between camera and lens and coverter. Are the contacts clean?

I would never use a 3x converter - every one I have ever tried has been dreadful.
Best regards, John
Add a Comment
You must be registered or logged-in to comment.