to sell or not to sell -pentax 50mm


Taynuiltpixels

Link Posted 05/03/2014 - 17:06
Having been buying a lot of old glass, things are now settling and I think it is time to sell some bits as I find my various keepers. I have copies of both pentax M1.7 50mm, M1.4 50mm - obviously I am minded to keep the 1.4 but I am wondering what 1.7 has over the 1.4, if anything, before I decide sell it - any advice gratefully received.
"All you ever gotta do is be a good man one time to one woman"
(Janis Joplin)

KIT: K5iis, DAWR18-55mm,FA4.5 80-320mm, Mitsuki 5.6 400mm, M1.7 50mm, M1.4 50mm, M2.8 28mm, Miranda M2.8 28mm, M3.5 135mm, M1.4 200mm, Vivitar S13.5 70-210mm, Vivitar A 2.8 90mm macro,
Sigma150-500mm F5-6.3 APO DG HSM.

johnriley

Link Posted 05/03/2014 - 17:14
The different lenses have different characteristics, being intended for different purposes.

The f/1.4 is a low light and reportage lens, so has high contrast and lower resolution. It's ideal for newspaper and magazine reproduction. It is unlikely to have a flat field at close distances, so is less suitable for close ups.

The f/1.7 will have higher resolution and a flatter field. It is more suitable for close ups and attaching to bellows and fitting close up lenses. In other words, it can take more optical abuse and still deliver the goods.

I would use both for now, much more intensively, and eventually you will find out for sure which one meets your needs best.
Best regards, John

Taynuiltpixels

Link Posted 05/03/2014 - 17:26
Thanks John - that is good advice, I evidently still have a bit of exploring to with the 1.7 - as ever I am learning - "flatter field" could you elaborate - do you mean less depth of field?
"All you ever gotta do is be a good man one time to one woman"
(Janis Joplin)

KIT: K5iis, DAWR18-55mm,FA4.5 80-320mm, Mitsuki 5.6 400mm, M1.7 50mm, M1.4 50mm, M2.8 28mm, Miranda M2.8 28mm, M3.5 135mm, M1.4 200mm, Vivitar S13.5 70-210mm, Vivitar A 2.8 90mm macro,
Sigma150-500mm F5-6.3 APO DG HSM.

Smeggypants

Link Posted 05/03/2014 - 19:11
I'd keep both if you can. Very different.


flatter feild = less distortion
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

johnriley

Link Posted 05/03/2014 - 19:45
Flatness of field relates to a lens projecting an image onto a flat surface. A lens with a flat field, such as a macro lens, will give an image of flat subjects that are sharp from centre to edge.

A lens with field curvature will give images sharp in the centre but not the edge, or vice versa. Lenses naturally have field curvature, so it has to be corrected by good lens design. This is much more difficult with fast, wide aperture lenses.

Hope that helps!
Best regards, John

Taynuiltpixels

Link Posted 05/03/2014 - 20:24
Thanks John - I am now more knowledgeable than I was at 17.26 today!

Thanks for all the feedback folks - me thinks I'll keep them both!
"All you ever gotta do is be a good man one time to one woman"
(Janis Joplin)

KIT: K5iis, DAWR18-55mm,FA4.5 80-320mm, Mitsuki 5.6 400mm, M1.7 50mm, M1.4 50mm, M2.8 28mm, Miranda M2.8 28mm, M3.5 135mm, M1.4 200mm, Vivitar S13.5 70-210mm, Vivitar A 2.8 90mm macro,
Sigma150-500mm F5-6.3 APO DG HSM.

Jonathan-Mac

Link Posted 05/03/2014 - 21:23
The 1.7 is smaller, lighter, and sharper wide open.

The 1.4 has better bokey due to the eight (vs six) blades, and can be set at f/2.4 (where it performs superbly).

You won't get much money selling the 1.7, so you may as well keep it.
Pentax hybrid user - Digital K3 & K200D, film 645 and 35mm SLR and Pentax (&other) lenses adapted to Fuji X digital
Fan of DA limited and old manual lenses

davidstorm

Link Posted 05/03/2014 - 22:05
I would also keep both. I have various MF lenses at or around the 50mm mark, M50 F1.4, A50 F1.7, K55 F1.8 and a Chinon 50mm F1.9, all are excellent lenses but the one I keep coming back to is the M50 F1.4. It has something different and always gives me good results.

I don't hesitate to use the M50 wide open - it is not soft even at F1.4 and I find it works really well for portraits.

Regards
David
Flickr

Some cameras, some lenses, some bits 'n' bobs

bforbes

Link Posted 05/03/2014 - 22:30
davidstorm wrote:
I would also keep both. I have various MF lenses at or around the 50mm mark, M50 F1.4, A50 F1.7, K55 F1.8 and a Chinon 50mm F1.9,

why the Chinon?
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/

davidstorm

Link Posted 05/03/2014 - 23:52
bforbes wrote:
why the Chinon?

Hi Barrie, not sure I fully understand the reason for your question, but I've always had a couple of Chinon F1.9 50mm lenses that are a legacy of film SLR's I once owned. I've kept them as I like them, but they don't get much use nowadays. They are worth next to nothing, so not worth selling and they are also good video lenses that my son likes to use on his K-01.

Regards
David
Flickr

Some cameras, some lenses, some bits 'n' bobs

bforbes

Link Posted 05/03/2014 - 23:56
I wondered if you had a preference for the Chinon over and above the various Pentax 50's
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/

davidstorm

Link Posted 06/03/2014 - 00:08
bforbes wrote:
I wondered if you had a preference for the Chinon over and above the various Pentax 50's

No, not really a preference Barrie, but it certainly does take nice shots, it has a warm colour balance and very nice bokeh at wide apertures. It seems to me to have quality glass and a character that is quite different from the Pentaxes, but appealing nonetheless.

Regards
David
Flickr

Some cameras, some lenses, some bits 'n' bobs

Smeggypants

Link Posted 06/03/2014 - 00:33
I think it's cool to keep old lenses if they are worth next to nothing monetary wise. Sometimes you just feel like using something different.

I've still my very first lens, a Ricoh 50mm/2.2 K mount, amongst a few others.
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

womble

Link Posted 06/03/2014 - 07:19
I have my original M50/2 which is worth next to nothing but I won't sell it. I even had it serviced recently-ish to get rid of the stickyness caused by a pint of beer in c. 1985...

Sentiment is a powerful thing.

K.
Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.

My website

K10D

Link Posted 06/03/2014 - 07:26
womble wrote:
I even had it serviced recently-ish to get rid of the stickyness caused by a pint of beer in c. 1985...

K.

A spilt pint! Just the financial loss alone is enough to bring anyone in Perth to tears!

Best regards
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