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 Replies: 529 / Views: 85,206 |
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Pillar of the Community
2087 Posts |
This suggestion may not look that cheap. It is not a beginners lens. I am posting it as it is one of the cheapest listings I have seen in a long time( assuming it sells close to the listing price) the buy it now price is at "normal" market level. SChneider Kreuznach APO Componon 40mm F 2,8 HM ( high modulation) http://www.ebay.at/itm/Schneider-Kr...AOSw9NdXrJZAEdited by austrokiwi
08/13/2016 02:19 am
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Pillar of the Community
2087 Posts |
Edited by austrokiwi
08/14/2016 2:11 pm
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Valued Member
United States
430 Posts |
What about a fixed aperture Rodenstock Rodagon 80mm lens. Does the fixed aperture limit this lens?
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Pillar of the Community
  United States
3932 Posts |
The Rodagon 80/4 is very good wide open, though f4 is a bit wide, and will force you to stack on smaller coins.
Having a fixed aperture is actually very liberating. No aperture to worry about getting just right. Just shoot to get the best image you can. It may take stacking, but the nice thing about stacking is you are guaranteed the final image is in perfect focus all over.
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Valued Member
United States
430 Posts |
I have gone on a lens buying binge recently and I have a few questions. First, I bought a vintage SK 80mm 5.6 enlarging lens not realizing it is not a Leica 39mm mount. I know it is 25mm but am unsure of the thread pitch. It is either 1.0 or 0.75 and I don't want to buy the wrong adapter. Does anyone know this?
I have a couple of lenses with illuminated aperture dials. What is the best way to block the light leak from this? Electric tape? Black paint?
I want to start experimenting with reversing the enlarging lenses, but the adapters are around $30 each. Is there a sweet spot for focal length of lenses that are reversed. From what I've read the shorter length lenses (25-50mm) work better. Do 6 element lenses work better than 4 when reversed?
And finally what is the advantage to stacking lenses? Is it to get higher magnifications?
I hope I didn't ruin this thread with all these questions.
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Pillar of the Community
United States
3932 Posts |
Those older enlarging lenses with small mount diameter are exceptionally nice to use because the lens is so small in diameter and does not get in the way of lighting. I have several of these small lenses and they are a joy to use, though tough to adapt! I have an SK Comparon 75mm and an SK Componar 75mm, and both have M25 x 0.5mm threading, so I would guess yours is the same. Compare an M39 with your M25, and if the M25 looks really fine it is 0.5mm. It should be finer looking than a T-mount adapter, which is 0.75mm.
I have found that the illuminated aperture dial issue is a lot of hype. I never block them. I tried it both ways and could not tell the difference. This is mainly because I shoot with wide apertures, such that the amount of light going through the lens is much, much brighter than the light going through the illuminated dial. If you stop down, then it would probably be noticeable. It also may be more noticeable on silver coins than on the copper I shoot. If you do want to block it, I'd suggest black electrician's tape.
Reverse adapters are definitely expensive. You can end up spending quite a bit to cover a range of different thread sizes. The focal length you choose depends on the magnification you're trying for. If you want to do 2-3x, then a 50-75mm works well. For 4-5x, 35mm is good. For higher mags, almost certainly a cheap microscope objective will give better results.
Stacking is a way to avoid using bellows. Depending on the lens used as objective, and its optimum aperture, stacking can either work better or worse than bellows or extensions. You need to experiment. Adding extra glass is usually not the best idea, but if the tube lens is high quality there can be very little degradation. The objective generally determines the image quality, and the tube lens just magnifies the central portion of the image from the lens.
This thread has been broad-scoped since the beginning, so no worries on asking questions about how to use the El-Cheapos you buy!
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Pillar of the Community
United States
3932 Posts |
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Pillar of the Community
United States
3932 Posts |
Contact me for photographic equipment or visit my home page at: http://macrocoins.com |
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Pillar of the Community
Canada
2784 Posts |
wow there was some great deals there. thanks for listing these ray.
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Valued Member
Ireland
82 Posts |
Hi all, just wondering if anyone tried a printers loupe and a mobile phone or lens before?  I have plans to use an OHP lens on a stand to create a registry distance and use my mobile phone. This could be a simple perspex tube cut to the desired length.  |
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Valued Member
Canada
185 Posts |
Actually I have... its great for up close shots... but not awesome for getting the whole coin in.
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Valued Member
Ireland
82 Posts |
actually you are right, its perfect for small coins
and great for detail or "macro" shots.
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Pillar of the Community
2087 Posts |
If the dirt in the lens can be cleaned it is a a potentially very good deal. The lens is designed for 16mm film but reversed it will cover a full frame sensor( 36mm X 24mm). Its an Achromatic Gauss design with 6 elements in 5 groups. It doesn't have a filter thread but RAF camera makes an adapter( you will also need a 52mm Reversing ring. It produces good images up to about 8X magnification. http://www.ebay.co.uk/itm/Minolta-3...AOSwFBRZbNIaEdit: Its sold now. Edited by austrokiwi
07/18/2017 12:41 am
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Pillar of the Community
2087 Posts |
This is a cheap good quality lens. The only issue with it is the lack of a filter thread for mounting the lens. RAF camera produces a suitable adapter. Alternately you can attach a 48-52mm stepping ring with insulation tape and then use a 52 mm reversing ring. The lens is an Achromat http://www.ebay.co.uk/itm/Minolta-C...AOSwrqlZfTpMEdited by austrokiwi
08/02/2017 2:53 pm
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Pillar of the Community
United States
3932 Posts |
Looks like a nice lens, and at 80mm FL fits in my 80mm shootout nicely. I may just have to bid on it. Thanks...Ray
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Replies: 529 / Views: 85,206 |
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Posted 08/13/2016 02:12 am
